Engineer jobs in North Reading, MA - 2,746 jobs

About us We are an MIT-born, venture-backed Silicon Valley startup building Engineering General Intelligence (EGI)-an AI Copilot for design and manufacturing. Our mission is to fundamentally reinvent how physical products are designed and built, dramatically accelerating the pace of product development. About the Role You'll play a critical role in designing EGI: AI that understands how to design, reason, and build like an experienced mechanical engineer. In this role, you'll use your deep knowledge of mechanical design and manufacturing to create high-quality reference models, engineering workflows, and datasets that power our AI systems. You'll embed engineering judgment into the training loop and shape how machines learn to solve real-world design and manufacturing problems. Responsibilities Design and build high-quality mechanical components and assemblies in CAD to serve as ground truth for training and evaluating AI systems. Define and maintain standards for model quality, metadata, and annotation to ensure consistency and reliability across datasets. Collaborate closely with ML, software, and product teams to shape dataset requirements and influence model behavior through representative engineering examples. Manage and guide a team of external contractors, including writing SOPs, reviewing output quality, and ensuring timely delivery of data assets What we're looking for Bachelor's or Master's degree in Mechanical Engineering or related field. Strong foundation in machine design, product development, and design for manufacturing (DFM). Experience with one or more CAD platforms (e.g., Siemens NX, SolidWorks) with the aptitude to pick up new ones quickly. Strong attention to detail and appreciation for data/model quality. Excellent written and verbal communication skills, especially when documenting processes or communicating across teams. Experience managing external contractors or vendors, including writing clear standard operating procedures (SOPs), reviewing work quality, and providing feedback. Bonus Points Experience working with Software/ML teams. Experience with CAD automation and parametric model generation. Understanding of how large language models (LLMs) or other ML systems are trained and evaluated. #J-18808-Ljbffr

A biomedical technology company in Boston seeks a Principal Product Development Engineer to lead the design and development of an innovative in vitro diagnostic device. The candidate will apply advanced scientific principles in whole blood hemostasis testing and will work collaboratively within a multidisciplinary team to solve complex challenges in a fast-paced environment. A strong academic background in bioengineering, biochemistry, or analytical chemistry is required along with relevant experience in assay development and device integration. #J-18808-Ljbffr

A leading health solutions company in Boston is seeking an AI Lead to oversee the development and deployment of AI and Machine Learning solutions. The role involves strategic planning, technical oversight, and collaboration with cross-functional teams. Candidates should have a Bachelor's degree and significant experience in AI/ML technologies. The compensation is competitive with comprehensive benefits and opportunities for bonuses. #J-18808-Ljbffr

This position analyzes security engineering solutions, framework, roadmap, program optimization, process engineering, risk remediation, and mitigation of operational risk in a high-velocity culture by introducing technology, requirements, deliverables, gaps and systems design. Analyzes competitive strategies, cyber technologies, metrics models, and performance indicators. Position Compensation Range: $111,000.00 - $189,000.00 Pay Rate Type: Salary Compensation may vary based on the job level and your geographic work location. Relocation support is offered for eligible candidates. Primary Accountabilities Develops, integrates, and tests cyber products. Researches, engineers, and integrates new security solutions. Performs cyber defense incident triage, including determining scope, urgency, and potential impact, identifying the specific vulnerability. Builds strong relationships with peers across functions through collaborative engineering operations and initiatives. Designs and implements automated solutions to enable security needs. Designs and develops system-security measures to ensure cybersecurity is fully integrated. Validates current and future-state architectural models to assess impact across all cybersecurity technology systems. Develops enterprise tools and applications to manage access to enterprise data, systems and resources. Analyzes security access risk gaps and recommends mitigating and compensating security controls. Specialized Knowledge & Skills Requirements Python programming with experience in audit/compliance Interest in and experience with data analysis. XSOAR experience desired. Demonstrated experience providing customer-driven solutions, support or service. Solid knowledge and understanding of software engineering architectures, system/software designs, and system deployments. Solid knowledge and understanding of Cyber Security, Cyber Engineering, Computer Science, Software Engineering. Solid knowledge and understanding of security technologies and application development methodologies. Demonstrated experience performing cyber threat analysis and incident response. Working knowledge of penetration testing. Solid knowledge and understanding of directory services and identity stores. Licenses: Not Applicable. Travel Requirements: Up to 10%. Physical Requirements: Work that primarily involves sitting/standing. Working Conditions: Not Applicable. Additional Information Offer to selected candidate will be made contingent on the results of applicable background checks. Offer to selected candidate is contingent on signing a non-disclosure agreement for proprietary information, trade secrets, and inventions. Sponsorship will not be considered for this position unless specified in the posting. In this flex office/home role, you will be expected to work a minimum of 10 days per month from one of the following office locations: Highly preferred - Boston, MA 02110 / Secondary location-Madison, WI 53783; Candidates must reside within a 50-mile radius of the office location (or 35-mile radius for Boston) Internal candidates are encouraged to apply regardless of location and will be considered based upon the needs of the role. We provide benefits that support your physical, emotional, and financial wellbeing. You will have access to comprehensive medical, dental, vision and wellbeing benefits that enable you to take care of your health. We also offer a competitive 401(k) contribution, a pension plan, an annual incentive, 9 paid holidays and a paid time off program (23 days accrued annually for full‑time employees). In addition, our student loan repayment program and paid‑family leave are available to support our employees and their families. Interns and contingent workers are not eligible for American Family Insurance Group benefits. We are an equal opportunity employer. It is our policy to comply with all applicable federal, state and local laws pertaining to non‑discrimination, non‑harassment and equal opportunity. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. American Family Insurance is committed to the full inclusion of all qualified individuals. If a reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please email *************** to request a reasonable accommodation. #J-18808-Ljbffr

A leading technical solutions provider is seeking an engineer specialized in the medical device industry. The role involves designing manufacturing processes and ensuring compliance with safety regulations. Candidates should have a BBA in Engineering, knowledge in CSV, and problem-solving skills (Yellow or Green Belt). The position offers an opportunity to work with innovative technologies in a dynamic environment located in Caguas, Puerto Rico. #J-18808-Ljbffr

A leading cancer research institute in Boston seeks an Artificial Intelligence & Machine Learning Engineer/Scientist I. This role involves developing scalable AI solutions, collaborating within a dynamic team, and ensuring model performance. Candidates should hold a Bachelor's degree in a related field and possess at least one year of relevant experience. An inclusive work environment is emphasized, encouraging all qualified applicants to apply. #J-18808-Ljbffr

A defense technology company in Boston is seeking a hands-on leader to architect a scalable simulation environment, leveraging multi-threaded C++ and AI. Responsibilities include designing physics simulations, collaborating with teams, and mentoring developers. Candidates should have a Master's in a related field and relevant experience with a Secret clearance. Benefits include comprehensive healthcare, a 401k plan, and a flexible hybrid work arrangement. #J-18808-Ljbffr

Title: Lead Full Stack Engineer Reporting Structure: This role reports to the Head of Product & Engineering CivilGrid is a venture-backed SaaS construction tech company building the "Google Maps for the Underground." Come help us disrupt a $4.7T US industry segment that desperately needs innovation. This opportunity has tremendous upside as it scales. CivilGrid aggregates public and proprietary utility, geotechnical, environmental, and jurisdictional data. The consolidated information is sold via our collaborative SaaS mapping platform to engineers and developers who need it to make early-stage decisions on real estate and infrastructure projects. Real time data access reduces labor and project delays, accelerates decision making and reduces project risk. Collaborative features ensure faster information flow and decisioning inside and outside the organization and better project insight retention over time. Responsibilities As a small team, we all wear many hats and enjoy tackling new challenges. When it comes to tech, we're seeking experienced individuals who can efficiently identify problems and devise solutions. You will be a foundational team member with the opportunity to work on all aspects of the application and shape the technical future of CivilGrid. Joining at this stage, you will build core systems that will help us scale quickly, and benefit from tremendous upside as we grow. Design and build end-to-end features, covering everything from database models to user-facing components using React. Tackle a variety of areas: web and mobile applications, mapping interfaces, data processing pipelines, algorithmic relevancy, and real-time collaboration tools. Profile and tune performance across the entire stack to ensure efficient and responsive systems. Implement and maintain analytics, health monitoring, alerts, and logging to maintain operational visibility and system reliability. Conduct code reviews, mentor junior engineers, and offer constructive feedback to help grow the team's technical capabilities. Is this you? 5 years of experience working with JavaScript or TypeScript, particularly with React and Node.js (or equivalent frameworks). Comfortable driving 0→1 development-taking projects from conception through to production launches. Start Up Ready: Autonomous, moves fast, takes initiative without being asked Thrives in greenfield environments and enjoys architecting, designing, and execution of new systems and solutions. Experience working on a complex B2B Product Strong foundational knowledge of Postgres Familiarity with geospatial frameworks (PostGIS, GeoJSON, map rendering libraries, etc.) is a plus. Conduct code reviews, mentor junior engineers, and offer constructive feedback to help grow the team's technical capabilities. Strong verbal and written communication, able to articulate ideas clearly and collaborate effectively. Must be authorized to work in the United States Bonus Qualification: A degree in Computer Science, Civil Engineering, or a related field (B.S. or M.S.)-nice to have, but not required. Perks Interesting and challenging work Lots of room for growth Competitive salary and equity Health insurance Flexible and remote-friendly work environment FSA (health and dependent care) Unlimited PTO #J-18808-Ljbffr

Prudentia Sciences is an AI-powered technology platform transforming how biopharma, biotech, and life sciences investors approach portfolio management, due diligence, and value/risk simulation. Our platform accelerates investment in breakthrough therapies by: Empowering biopharma to accelerate drug pipelines, maximize ROI, and achieve clinical and commercial success for greater patient impact Enabling strategic positioning of asset value during portfolio planning and dealmaking Equipping investors with data-driven insights to optimize capital allocation in drug asset transactions Backed by GV (Google Ventures), Iaso Ventures, and Virtue, we're on a mission to unlock the full potential of pharmaceutical R&D by empowering decision-makers with real-time, data-driven insights. We're looking for a driven, hands-on ML/AI Engineer to help us push the boundaries of what's possible in AI-driven drug development. You'll work on production-grade LLM-based systems, knowledge graphs, and machine learning pipelines-turning prototypes into powerful tools that make a real-world impact. You'll collaborate across teams to design, build, and deploy intelligent systems that enhance how life sciences organizations make critical decisions. If you love working on technically challenging problems with direct impact in healthcare-this is the role for you. This is a remote-first position, but we'd love it if you're based in or near Boston. What You'll Do: Design and Deploy LLM Systems: Develop scalable, production-ready LLM applications using frameworks like LangChain/LangGraph. Build robust RAG pipelines and integrate knowledge graphs for biological and clinical data. Full-Stack AI Engineering: Write maintainable, high-performance code and build clean APIs and services for machine learning applications. Data Engineering Collaboration: Work with data engineers to build and optimize data workflows and pipelines for high-quality data ingestion and processing. Product-Focused Prototyping: Collaborate with product and domain teams to rapidly prototype AI solutions, iterate based on feedback, and scale models for production. Model Deployment & MLOps: Use modern MLOps tools to deploy and monitor models in production environments (AWS preferred). Ensure scalability, observability, and resilience. Collaborative Innovation: Partner with engineering, data, and business teams to identify and develop high-value AI/ML applications. Continuous Learning: Stay ahead of the curve on emerging ML frameworks, GenAI capabilities, and healthcare technologies. What We're Looking For:Core Qualifications: Education: Bachelor's, Master's, or Ph.D. in Computer Science, Data Science, Engineering, or a related field. Hands-on AI Experience: Proven ability to build, train, and deploy ML and NLP models, especially those powered by LLMs and transformer architectures. LLM & LangChain Experience : Practical experience working with frameworks like LangChain for applications such as Q&A systems, chatbots, or document automation. Software Engineering: Strong coding skills in Python and experience using Git/GitHub and CI/CD practices. Data Engineering Know-how: Comfort working with ETL pipelines, relational and non-relational databases, and data platforms like Snowflake or Databricks. Big Data & ML Frameworks: Familiarity with Big Data tools (e.g., Apache Spark) and experience orchestrating data workflows using tools like Apache Airflow. Cloud & MLOps: Experience with deploying ML models in cloud environments (AWS, GCP, or Azure) and using containerization/orchestration tools like Docker and Kubernetes. Soft Skills: Strong problem-solving skills and an analytical mindset. Passion for continuous learning, rapid prototyping, and iterating based on user needs. Autonomous, self-starter attitude with a strong sense of ownership. Excellent communication skills-able to explain technical ideas clearly to non-technical audiences. Collaborative team player with a desire to build things that truly matter. Bonus: Experience in healthcare, life sciences, or biopharma sectors (preferred but not required). Why Join Us? Make a tangible impact on drug development and patient outcomes. Work with a passionate, mission-driven tackling complex challenges. Enjoy flexibility and autonomy in a remote-first culture. Competitive salary, equity, and benefits. Opportunity to grow with a fast-moving, well-funded startup backed by top-tier investors. What We Offer Impact: Your work directly enables breakthrough therapies to reach patients faster Ownership: Build and lead the customer success function as a foundational leader Growth: Shape customer experience during a critical scaling phase Compensation: Competitive salary, performance bonus, and equity Location We are a remote-first company, but looking for team members to be located in the Northeast (Boston, New York, DC, etc.) Remote (New York, New York, US) Remote (Washington, District of Columbia, US) #J-18808-Ljbffr

A dynamic tech startup in Boston is seeking a core engineer to join a tight-knit team. The ideal candidate has 5-10+ years of experience with Ruby on Rails, LLMs, and can navigate both backend and frontend tasks. You will play a crucial role in building large applications, integrating AI models, and driving product iterations. Ideal for someone who thrives in fast-paced environments and values ownership, this position offers competitive compensation and stock options. #J-18808-Ljbffr

Join us in this role where you'll work within the Generation Engineering team and global operational Technology & Security utilizing technical expertise and engineering methods to increase reliability of fleet assets, thus reducing plant downtime. You'll be working with a wide variety of control systems, analysing processes, and making improvements, as well as gaining experience in other systems which are critical for our assets operations. You'll be raising the standards for Supervisory Control and Data Acquisition (SCADA) and cyber security. Welcome to Americas Generation Engineering You will join the global Generation Technology & Security team, focusing on our Americas assets. Together with your colleagues, you will address both complex and routine engineering challenges faced by the operational asset portfolio and help drive change through to completion. Your job will be to onboard existing and new sites into the OT community as well as provide practical and efficient solutions to these problems using the tools available. You'll also be one of the regional focal points for our global support team. As a team, we create good engaging relationship with different stakeholders, identify shortcomings in existing business practices, and suggest and implement improvements. You'll play an important role in: supporting the organization in implementing existing and new assets into the global OT organization driving operational excellence through watertight cybersecurity for all our asset sites by proactively addressing immediate and long-term issues and opportunities, maintaining integrity all the while working with internal and external suppliers to remedy issues and implement new functionalities maintaining the integrity of OT systems by preventive maintenance and lifecycle management troubleshooting all assets OT systems when needed. To succeed in the role, you: demonstrate strong SCADA, OT, and IT knowledge, have a curious mindset, and an innovative approach to problem solving with at least eight years of experience in a related role are enthusiastic about physical and online security and proactively intervene to make our workplaces hazard-free are competent in analysing system processes and the control of them possess effective communication skills that allow you to achieve results in teams with many stakeholders and enjoy working on complex, challenging, and often ambiguous tasks are able to work in an organized way in changing environments. Maybe you've read the above and can see you have some transferable skills, even though they don't quite match all the points. If you think you can bring something to the team, we still encourage you to apply. Shape the future with us Send your application to us as soon as possible. We'll be conducting interviews on a continuous basis and reserve the right to take down the advert when we've found the right candidate. As an applicant or employee, you may request reasonable work and position accommodation or adjustments via accommodation@orsted.com. Please note that you're expected to do some travelling in relation to your work, as you'll be going to asset location to work on equipment as well as training and team meetings in the US and Europe as needed. Please note that for your application to be taken into consideration, you must submit your application via our online career pages and answer the screening questions relevant for your country. We don't take applications or inquiries from external recruiters or agencies into account for this position. #J-18808-Ljbffr

An innovative tech company is seeking a Senior Mobile Engineer to drive the development of cutting-edge mobile applications for its vehicle intelligence platform. In this pivotal role, you will collaborate across teams to create a responsive mobile experience that supports real-time public safety efforts. Ideal candidates have extensive experience in mobile application development, especially related to video streaming and IoT connectivity, and will thrive in a fast-paced environment committed to fostering diverse perspectives and promoting safety in society. #J-18808-Ljbffr

A premier talent firm seeks a Technical Solutions & Support Specialist to provide expert support for customer systems in New York. In this role, you will work directly with clients to ensure fast and effective solutions while collaborating closely with the internal engineering teams. The ideal candidate will have a relevant degree, excellent communication skills, and a strong technical background. Salary ranges from $80,000 to $120,000 USD, accompanied by comprehensive benefits including full medical coverage, flexible work environment, and opportunities for relocation. #J-18808-Ljbffr

A systematic investment firm in Boston is seeking a Senior AI Software Engineer to design and develop innovative AI solutions. Candidates should have substantial experience with Python and machine learning, alongside strong analytical and collaboration skills. The role involves integrating diverse data sources and optimizing AI systems for performance and scalability. This position offers a competitive salary range between $115,000 and $325,000 per year. #J-18808-Ljbffr

A seed-stage AI startup is seeking a Forward Deployed Data Scientist to work directly with enterprise customers. This role involves translating business challenges into actionable solutions using AI-driven workflows. Candidates should have a strong background in data engineering and experience working with LLMs. The position offers a competitive salary, flexible remote-first culture, and the chance to shape the future of customer engagement and product strategy. #J-18808-Ljbffr

About the Company Critical Process Filtration, a TCPA Company, a leading manufacturer of high-quality filtration solutions for pharmaceutical, electronics, process water, and gas filtration is looking for a Applications Filtration Engineer. About the Role The Applications Filtration Engineer will support the development, evaluation, and optimization of filtration technologies across a broad range of bioprocessing and industrial applications. This role plays a key part in shaping next-generation products through experimental research, customer application analysis, and cross-functional collaboration. The Applications Filtration Engineer will be responsible for designing studies, generating performance data, supporting product development, and ensuring our filtration solutions meet both technical and customer-driven requirements. This role offers the opportunity to contribute directly to innovative filtration solutions that serve high-growth global markets. Responsibilities Technology & Application Development Support the development and characterization of filtration technologies including normal flow filtration, tangential flow filtration, and solid/liquid separation systems. Design and execute laboratory experiments to assess filter performance, validate test methods, and evaluate new materials and device configurations. Analyze performance data and use statistical tools to develop insights, optimize designs, and provide recommendations for product improvements. Translate customer application needs into engineering requirements to guide internal R&D efforts. Customer & Market Support Partner with sales, marketing, and product management to provide technical expertise for key customer applications. Assist in field evaluations, prototype testing, and troubleshooting to ensure optimal performance in customer processes. Support the preparation of technical documentation, application notes, presentations, and training materials. Cross-Functional Collaboration Work closely with manufacturing, quality, regulatory, and engineering teams to ensure product readiness and alignment with customer expectations. Participate in product development reviews and provide data-driven input on design, performance, and application requirements. Engage with internal stakeholders to drive continuous improvement in test methods, product understanding, and application knowledge. Innovation & Research Identify emerging filtration technologies, materials, and methods that can enhance performance or open new market opportunities. Contribute to intellectual property development, internal reports, and industry conference presentations. Qualifications Bachelor's, Master's, or PhD in Chemical Engineering, Biochemical Engineering, Biomedical Engineering, Mechanical Engineering, or another STEM discipline. Relevant experience in biotechnology, bioprocessing, filtration, or related laboratory research. Strong understanding of filtration principles, membrane technologies, or downstream bioprocessing. Experience designing and conducting laboratory experiments and developing test methods. Proficiency with statistical analysis, DOE, and data processing tools (e.g., Minitab, Excel, Python, MATLAB). Familiarity with data acquisition systems, sensors, and laboratory instrumentation. Knowledge of computational modeling or fluid dynamics (e.g., COMSOL) is a plus. Effective communication skills with the ability to present technical information to multiple audiences. Demonstrated problem-solving ability and a track record of technical accomplishments. Equal Opportunity Statement Critical Process Filtration is proud to be an equal opportunity employer. EEO Statement: We do not discriminate in hiring on the basis of sex, gender identity, sexual orientation, race, color, religious creed, national origin, physical or mental disability, protected Veteran status, or any other characteristic protected by federal, state/province, or local law.

A national construction enterprise in Boston is looking for a SharePoint and Power Platform Developer. This role involves designing and developing applications using SharePoint Online and the Power Platform suite, as well as collaborating with stakeholders to create solutions that solve business problems. The ideal candidate has over 5 years of experience and a strong background in related technologies. The company offers a comprehensive compensation package, including competitive salaries and various benefits. #J-18808-Ljbffr

Principal Product Development Engineer to join a team of scientists and engineers located in our Boston, MA Research and Development Systems Engineering Laboratory contributing to the design and development of an in vitro diagnostic (IVD) device. This role involves applying advanced scientific principles and creating reliable, accurate, and regulatory-compliant clinical diagnostic solutions in whole blood hemostasis testing. The focus of this position will be to evaluate and develop novel assay designs to drive innovative solutions to complex issues. This individual will be both a leader and collaborator within the multidisciplinary development project team to ensure timely and proficient completion of projects in a fast-paced and evolving environment. The ideal candidate will have a strong background in bioengineering, biochemistry, analytical chemistry, or similar fields combined with experience in assay development and device integration. We are seeking a highly skilled and innovative **Key Responsibilities** Perform analytical performance studies to ensure product requirements are met.Work with the clinical science team to write clinical trial protocols and reports.Contribute to the management of the laboratories including tracking calibrations, environmental monitoring, safety hazards, and other tasks, as required.Exhibit highly effective communication and collaboration skills that can be applied across functions. **Qualifications** **Education:** Ph.D. or M.S. in Bioengineering, Biochemistry, Analytical Chemistry, or related field. **Experience:** Experience developing and optimizing assays on disposable microfluidic or cartridge-based platforms.Experience in reagent formulation and stabilization for microfluidic applications (small-volume drying, bead-based reagents, in-channel drying, long-term stability on plastic substrates).- **Preferred Experience**Hands-on experience with developing assays or diagnostic platforms.Experience with data analysis software and statistical tools. **Skills:** Strong knowledge of biochemical, reagent-driven, clinical diagnostics.Familiarity with regulatory requirements (FDA, CLSI, IVDR, ISO standards).Excellent problem-solving, project management, and communication skills.Depending on your location, you may be eligible for more detailed information related to the compensation and benefits related to this job posting. If you believe you may be entitled to such information by law, you may contact **************, Monday through Friday, 7:30 a.m. - 5 p.m. ET or email *********************. #J-18808-Ljbffr

Mentor Technical Group (MTG) provides a comprehensive portfolio of technical support and solutions for the FDA-regulated industry. As a world leader in life science engineering and technical solutions, MTG has the knowledge and experience to ensure compliance with pharmaceutical, biotechnology, and medical device safety and efficacy guidelines. With offices in Caguas, PR, Boston, MA & San Francisco, CA and we serve life sciences clients in six global markets: United States, Puerto Rico, Dominican Republic, Mexico, Germany, Canada, and South America. Responsibilities Engineering Experience in Medical Device Industry Problem Solving Knowledge (Yellow or Green Belt knowledge) Responsibilities may include the following and other duties may be assigned. Designs manufacturing processes, procedures and production layouts for assemblies, equipment installation, processing, machining and material handling. Designs arrangement of machines within plant facilities to ensure most efficient and productive layout. Designs sequence of operations and specifies procedures for the fabrication of tools and equipment and other functions that affect product performance. Adapts machine or equipment design to factory and production conditions. May incorporate inspection and test requirements into the production plan. Inspects performance of machinery, equipment, and tools to verify their efficiency, and investigates and initiates corrective action of problems and deficiencies to ensure product quality. Develops manufacturing processes that are applicable to statistical process control, and may develop those techniques. Provides guidance to engineering regarding design concepts and specification requirements to best utilize equipment and manufacturing techniques. Ensures processes and procedures are in compliance with regulations. Qualifications Requirements/Knowledge/Education/Skills BBA in Engineering Knowledge in CSV Problem Solving Knowledge (Yellow or Green Belt knowledge) Mentor Technical Group is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, genetic information, national origin, protected veteran status, disability status, or any other characteristic protected by law. #J-18808-Ljbffr