Principal Full Stack Software Engineer

Location: Cambridge, UK – This role offers flexible working options. Candidates must be based or willing to relocate to a comfortable commuting distance from our Cambridge office for onsite attendance as needed.Are you an enthusiastic full stack engineer eager to create scalable, high-performance systems that enhance player experiences? Join our Subscriptions and Payments team at Jagex, where you will play a key role in developing and maintaining the systems that facilitate digital goods and subscription purchases across the RuneScape franchise. Your contributions will directly empower millions of player transactions globally.In this impactful role, you will help build secure, robust, and scalable services while mentoring junior engineers and continuously enhancing the reliability and performance of our subscription and payment platforms.Your Responsibilities:Engage in all phases of the Software Development Lifecycle, producing secure code supported by automated testing, peer reviews, documentation, and deployment.Develop and maintain backend services utilizing Java and Spring Boot in a microservices architecture.Create frontend applications using JavaScript/TypeScript and modern frameworks like React, Next.js, and Node.js.Design and integrate RESTful APIs and publish-subscribe messaging systems.Ensure services are monitored for scalability, high availability, and performance.Support production systems and participate in an on-call rotation.Drive system improvements, performance optimizations, and architectural advancements.Assess and implement both commercial and in-house technical solutions as appropriate.

At Cambridge Mobile Telematics (CMT), we are leading the charge in telematics solutions, dedicated to enhancing road safety globally. Our innovative AI-driven platform, DriveWell Fusion®, integrates sensor data from millions of IoT devices—ranging from smartphones and proprietary Tags to connected vehicles and dashcams—along with contextual data to provide a comprehensive view of vehicle and driver behavior. Our insights empower auto insurers, automakers, commercial mobility companies, and public sector organizations to improve risk assessment, safety measures, claims processes, and driver enhancement programs. With our headquarters based in Cambridge, MA, and additional offices in Budapest, Chennai, Seattle, Tokyo, and Zagreb, we protect and support millions of drivers worldwide each day.As a Senior Full Stack Software Engineer, you will play a pivotal role in designing, developing, and maintaining scalable web applications that fuel our telematics platform. You will navigate the entire tech stack, crafting intuitive user interfaces and robust backend systems while collaborating closely with product, design, and data teams. This dynamic role is ideal for a hands-on engineer who thrives in a fast-paced environment, fosters mentorship, and possesses a strong sense of ownership and curiosity. Your contributions will significantly impact user experience with CMT’s products, reinforcing our mission to enhance road safety globally.CMT seeks a highly collaborative, customer-focused, and innovative Senior Full Stack Software Engineer who is eager to join us in making roads safer by empowering drivers!

Join EverQuote as a Senior Full Stack Software Engineer on our B2B Agency Feature Team, a pivotal group shaping the future of our Agency business. This is more than just an engineering position; you will collaborate closely with all platform teams to design, develop, and scale agency features that fuel EverQuote's B2B growth. Your contributions will significantly impact how agencies utilize our platform and drive revenue on a large scale. Take charge of creating innovative, user-centric applications and interactive services that are quick, reliable, and built for substantial growth. Envision bold UI advancements, seamless front-end architecture, and essential experiences that agencies rely on. Become part of a dynamic, collaborative team of engineers who prioritize speed and meaningful output. You won't just contribute; you'll lead as a technical mentor, enhancing your team's capabilities through your expertise in modern front-end development, outstanding UI/UX design, and the progressive use of AI tools to boost developer efficiency. If you're eager to create impactful products, nurture a talented team, and influence a rapidly scaling platform, this position is for you. This role is hybrid, requiring in-office attendance several days a week. The base salary range for this full-time hybrid position is $150,700 to $177,300. Starting salaries will typically fall within the lower range. Depending on their specific role, level, and responsibilities, employees may qualify for company variable compensation or equity programs.

Your Impact at Lila Be a part of revolutionizing the scientific landscape! We are on the lookout for a Senior Full Stack Software Engineer to enhance our software platform team. In this role, you will partner with fellow software engineers, laboratory scientists, and machine learning experts to develop innovative tools aimed at streamlining automated scientific analyses. This position encompasses both web services and data engineering, with a robust focus on Python development tailored to scientific applications. If you excel in a collaborative, dynamic environment and apply best practices in version control, development workflows, and user-centered design, we encourage you to reach out! What You'll Be Building Design & Build Services and Front-ends: Create high-performance, secure, and well-documented code that seamlessly integrates with our existing ecosystem of services and applications. Performance & Reliability: Identify and rectify system bottlenecks, ensuring high availability and low-latency performance across extensive workloads. Cloud & Infrastructure: Utilize AWS services, Kubernetes, and contemporary DevOps practices to construct and deploy production-grade systems at scale. Cross-Functional Collaboration: Collaborate with machine learning researchers, engineers, and scientists to weave together data pipelines, APIs, and cloud infrastructure within scientific workflows and services. What You’ll Need to Succeed Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field. 4-8 years of experience in software development within a commercial context. Full Stack Development: Proven experience in developing web applications across the complete stack using React, TypeScript, Monorepos like Nx, TailWind, FastAPI, SQL/NoSQL, Python, and Pydantic. Cloud & DevOps Expertise: Hands-on experience with AWS, GCP, or Azure; deep understanding of Kubernetes, containerization, infrastructure-as-code (Terraform, CloudFormation), and CI/CD pipelines (GitHub Actions). Communication & Collaboration: Excellent listening skills and a record of effective cross-functional teamwork with scientists, data engineers, and product teams; adept at conveying complex concepts to diverse audiences. Problem Solving: Established ability to tackle complex backend challenges, weighing trade-offs between scalability, performance, and maintainability.

Location: Cambridge, MA (Eastern Time / UTC -4)Relocation package: AvailableStart date: ASAPLanguages: English (required)About the RolePragmatike is collaborating with an innovative AI startup, acknowledged as a Top 10 GenAI company by GTM Capital, founded by researchers from MIT CSAIL. We are looking for a Principal Full Stack Engineer specializing in Node.js + React who possesses extensive hands-on expertise in crafting scalable, high-performance web applications that support intricate, data-driven AI solutions utilized by Fortune 500 clients.This position is perfect for those who relish taking ownership of features from inception to completion—encompassing backend architecture and refined frontend delivery. The ideal candidate will be adept at designing APIs, constructing scalable services, developing user-friendly interfaces, and deploying production-ready features at scale.ResponsibilitiesDesign, develop, and maintain scalable full stack applications using Node.js, React, and TypeScript.Architect and create robust backend services, APIs, and data models.Build modern, production-grade web interfaces with React.Own features throughout the entire lifecycle, from technical design and implementation to deployment and production support.Enhance performance across the stack, including frontend rendering, API latency, and database queries.Collaborate closely with product, design, and AI/ML teams to deliver user-centered features.Establish best practices for testing, code quality, observability, and CI/CD processes.Enhance overall system architecture, scalability, and developer experience.Diagnose and resolve production issues spanning both frontend and backend systems.QualificationsMinimum of 5 years of experience as a Full Stack Engineer.Strong expertise in Node.js (including frameworks such as Express, NestJS, or similar).Proficient in React and TypeScript in production settings.Experience designing RESTful APIs and working with databases like PostgreSQL or MongoDB.Solid understanding of modern web architecture and principles of distributed systems.Proven experience in building scalable applications and deploying them effectively.Exceptional problem-solving skills and a passion for technology.

Join Cambridge Mobile Telematics (CMT), the leading telematics service provider dedicated to enhancing road safety and driver performance. Our AI-powered platform, DriveWell Fusion®, aggregates data from millions of IoT devices, including smartphones and connected vehicles, to deliver actionable insights for auto insurers, automakers, and mobility companies. Headquartered in Cambridge, MA, with a global presence in cities like Budapest, Chennai, and Tokyo, we protect millions of drivers every day.We are on the lookout for a talented Principal Software Engineer to spearhead ambitious projects while mentoring our engineering teams in developing robust and scalable full-stack solutions. This pivotal role involves setting the technical direction for our platform and contributing to its ongoing success.If you are a collaborative, innovative, and customer-focused engineer eager to make a real impact on road safety, we invite you to apply!

Join ph7 as a Senior Software Engineer specializing in Core Data technologies including Hadoop and HBase. In this role, you will be at the forefront of developing innovative data solutions that drive business success. You will collaborate with cross-functional teams to design and implement scalable data architectures, ensuring the integrity and accessibility of data across platforms.

Join Gearset, the premier DevOps platform for Salesforce, where our users efficiently build and manage various aspects of their Salesforce development, from intricate CI/CD pipelines to robust disaster recovery solutions.Our platform operates as an independent tool, integrating solely through public APIs, allowing our engineering team to collaborate closely with domain experts who develop within the Salesforce environment. This partnership enables us to create innovative solutions that address the unique challenges our users encounter, facilitating rapid and secure Salesforce modifications.We relentlessly adhere to our agile approach, releasing multiple versions of Gearset daily and continuously enhancing our observability and infrastructure tools. This commitment allows us to swiftly identify and resolve issues, delighting our users with timely improvements.As a product-focused enterprise founded by engineers, we deeply value a robust engineering culture, collaboration, and quick feedback loops. With confidence in our product and market potential, we are poised for significant growth and have ambitious plans for the future.Our engineering teams are primarily located in Cambridge and Belfast. To get a glimpse of what it’s like to join Gearset as an engineer, check out this video.

Your Impact at Lila Sciences Become a pivotal part of the scientific revolution! We are looking for a Principal Software Engineer with extensive full-stack expertise to join our innovative software platform team. In this collaborative role, you will partner with software engineers, lab scientists, and machine learning experts to develop advanced tools for automated scientific analysis and beyond. Your responsibilities will encompass web services and data engineering, with a strong focus on Python development tailored for scientific applications. If you excel in a teamwork-oriented, fast-paced setting and adhere to best practices in version control, development workflows, and user-centered design, we would love to connect with you! Key Contributions You Will Make Design & Build Services and Front-ends: Create high-performance, secure, and well-documented code that seamlessly integrates with our existing services and applications. Performance & Reliability: Identify and resolve system bottlenecks, ensuring high availability and low-latency performance across large-scale workloads. Cloud & Infrastructure: Utilize AWS services, Kubernetes, and contemporary DevOps methodologies to build and deploy production-ready systems at scale. Cross-Functional Collaboration: Collaborate with machine learning researchers, engineers, and scientists to integrate data pipelines, APIs, and cloud infrastructure into scientific workflows and services.

Join Gearset, the premier DevOps platform for Salesforce, where our users can seamlessly develop and manage various facets of their Salesforce projects, from intricate CI/CD pipelines to robust disaster recovery solutions.The Gearset platform operates independently of Salesforce, utilizing public APIs for integration. While our engineering team does not work directly within the Salesforce environment, we collaborate closely with domain experts to devise innovative solutions to the unique challenges they encounter, enabling rapid and secure Salesforce modifications.Our commitment to excellence is reflected in our agile practices: we release multiple updates daily and continuously enhance our observability and infrastructure tools. This allows us to swiftly identify and address issues, ensuring that we deliver timely improvements that delight our users.As a product-centric company founded by engineers, we understand the importance of fostering a vibrant engineering culture, promoting teamwork, and maintaining tight feedback loops. We are confident in our product and market potential, and we have ambitious plans for the future.

About Us:D&J Precision Machine, located in the heart of Cambridge, Ohio, is a leading name in the diesel performance sector. Our cutting-edge facility is a hub of engineering excellence, where we apply precision manufacturing techniques to produce components that reflect our dedication to quality and innovation. If you are enthusiastic about superior craftsmanship and want to join a team that prioritizes excellence, D&J Precision Machine is the ideal place for you.Job Summary:As a Diesel Engine Core Technician, reporting directly to the Production Manager, you will play a crucial role in inspecting, cleaning, and evaluating the quality of engine cores returned for remanufacturing. This position is vital in ensuring that only the highest quality cores are selected for processing and reuse in the production of remanufactured components. The perfect candidate will possess a deep understanding of automotive and diesel engine components along with a strong commitment to maintaining quality standards throughout the remanufacturing process. Please note that this is a fully onsite position based in our Cambridge, Ohio facility.Duties: Conduct thorough inspections and assessments of returned engine cores, evaluating the condition of key components such as blocks, heads, and crankshafts. Clean and disassemble cores to prepare them for detailed inspection and remanufacturing. Identify, document, and report any defects, cracks, or signs of wear that may impact the core's reusability. Organize cores based on type, condition, and components to facilitate efficient remanufacturing processes. Utilize diagnostic tools and precision measuring instruments to verify the integrity and specifications of core components. Collaborate with fellow technicians to identify necessary repairs or replacement parts needed to restore cores to a functional state. Ensure all cleaned and inspected cores meet our stringent quality and safety standards. Maintain precise records of core evaluations, repairs, and inventory for effective tracking and reporting. Adhere to all safety protocols and quality control measures during the handling, cleaning, and processing of cores. Work alongside other departments to ensure timely processing of cores and minimize any potential delays in the remanufacturing workflow. Keep work areas organized and adhere to safety regulations and company policies. Perform additional tasks as assigned by your supervisor. Requirements:Experience: High school diploma or equivalent is required; technical certification in automotive or diesel mechanics is preferred. Demonstrated experience with engine components or in an automotive repair or remanufacturing environment. Solid understanding of various automotive and diesel engine components and systems. Strong attention to detail and commitment to quality and safety standards. Ability to work effectively in a team-oriented environment.

Office location: Cambridge, UK – This role provides flexible working arrangements, allowing for primarily remote work. Candidates should ideally be located (or be willing to relocate) within a reasonable commuting distance from our office to attend in-person as needed.Are you a seasoned mobile engineer with a talent for developing seamless, secure, and high-performance mobile applications for both iOS and Android platforms?As a Senior Mobile Engineer on our Player Gateway team, you will be instrumental in defining the player experience right from their first interaction with Jagex titles, guiding them from their initial visit to becoming engaged and active members of our gaming communities. Your work will lie at the crossroads of mobile engineering, platform optimization, and enhancing player experience, delivering scalable and secure solutions that serve as vital touchpoints across the RuneScape franchise.In this role, you will serve as a subject matter expert, spearheading the delivery of intricate mobile solutions while mentoring a talented team of engineers and fostering engineering excellence across the broader organization. Key Responsibilities:Engage across the complete Software Development Lifecycle, delivering secure, production-ready code backed by automated testing, peer reviews, and dependable deployment practices.Function as a subject matter expert, ensuring that technical solutions align with product requirements and adhere to Jagex's engineering standards.Take charge of the quality and delivery of complex engineering projects, ensuring that all outcomes meet stakeholder expectations.Collaborate across various teams and disciplines to deliver impactful, scalable technical solutions.Proactively identify areas for improvement within systems, services, and engineering procedures, driving a culture of continuous enhancement throughout the organization.Support team efficiency by assisting engineers in breaking down tasks into clear, value-driven increments and contributing to a robust and resilient production environment.Participate in an on-call rotation to troubleshoot and resolve production issues as necessary.Qualifications:Extensive experience in native mobile development for both iOS (Swift / Objective-C) and Android (Kotlin / Java), with a profound understanding of platform constraints such as lifecycle management, permissions, and store policies.Demonstrated ability to deliver secure, maintainable mobile architectures that seamlessly integrate with backend microservices.Experience with automated testing, CI/CD pipelines, version control systems, and performance profiling tools.Strong debugging, optimization, and problem-solving skills, with the capability to navigate established codebases effectively.Proven ability to mentor engineers and enhance engineering standards and best practices.Familiarity with C++ is a plus.

Join Engine as a Senior Associate in Community OperationsAt Engine, we empower visionary founders who are tackling the world's most critical challenges in areas such as climate change, health, and advanced technologies. Our commitment includes providing robust support through founder programs, access to shared infrastructure and labs, and the opportunity to connect with a diverse national network of corporate partners, investors, and industry experts.

About Speechify Speechify transforms text into audio, giving people new ways to access articles, documents, and books. The platform helps users listen to information when and how they want. With rapid growth, Speechify has become a leading solution for audio-based information. Role Overview The Senior Software Engineer will join the Core Experiences Team in Cambridge, United Kingdom. This group builds and maintains the core services and SDKs that power Speechify across multiple platforms. The position blends product and infrastructure work, focusing on reliable APIs and systems that shape the user experience. What You Will Do Work with product teams to define project scopes and streamline processes for faster customer feedback. Develop solutions using the cross-platform SDK, balancing integration needs and user experience. Improve existing features by designing efficient abstractions and refining algorithms to boost loading speed and parsing accuracy. Create cloud functions, lightweight backend services, and jobs using Kotlin.

Role Overview Speechify is looking for an iOS Core Product Software Engineer in Cambridge, MA. This role focuses on building iOS features that make technology more accessible and improve how users interact with our products. What You Will Do Work closely with other engineers and team members to design and develop new iOS solutions Contribute to core product features that support accessible technology Help shape user experiences through thoughtful software development Location This position is based in Cambridge, MA, USA.

About Speechify Speechify builds text-to-speech tools that help over 50 million people turn reading materials into audio. Users can listen to PDFs, books, Google Docs, news articles, and websites, improving both reading speed and retention. The product suite spans iOS, Android, Mac, a Chrome Extension, and a Web App. Speechify has earned recognition as Chrome Extension of the Year by Google and App of the Day by Apple. Team and Culture The team is fully distributed, with nearly 200 professionals who bring experience from Amazon, Microsoft, Google, and top universities such as Stanford. Speechify values a flat structure where anyone can step into leadership by showing technical skill and delivering results. The culture rewards strong work ethic, clear communication, and drive for success. New ideas and ownership are encouraged at every level. Role Overview: Tech Lead for Web Core Product & Chrome Extension This role focuses on guiding the direction of Speechify’s core web product and Chrome Extension. The Tech Lead will influence product decisions and help shape user experiences that keep users engaged. The position suits someone who thinks strategically, enjoys dynamic work, and has experience building products that users love. What You’ll Bring Proven ability to lead technical projects and shape product direction Experience designing and building high-quality user experiences Strong communication skills Commitment to delivering results and maintaining a high standard of work Interview Process The interview process consists of several technical interviews, typically completed within one week. Location Cambridge, MA, USA

The Engine supports Tough Tech entrepreneurs who are developing solutions for major global challenges. As a nonprofit, the organization connects founders with infrastructure, funding, and operational support to help turn breakthrough science and technology into real-world impact. Role overview The Chief Growth Officer (CGO) will lead The Engine through its next phase of growth. This executive shapes partnership strategies, drives revenue initiatives, and works to strengthen the organization’s market position. The CGO also serves as a strategic advisor to the CEO and leadership team, providing input on key organizational decisions. Who should apply Experienced leaders with a background in Tough Tech, either as entrepreneurs or commercial executives Individuals with a track record of scaling organizations and launching first-of-a-kind (FOAK) projects Candidates who have advocated for Tough Tech founders and engaged with the broader ecosystem Location This position is based in Cambridge.

Role Overview Speechify is hiring an iOS Core Product Software Engineer for its Cambridge, United Kingdom office. This role focuses on building and improving the core iOS application, working closely with teams across the company to deliver a smooth and reliable experience for users. What You Will Do Develop and maintain core features of Speechify’s iOS product Collaborate with engineers, designers, and product managers to shape new functionality Write clear, maintainable code and tackle technical challenges with creativity Contribute to a seamless, high-quality user experience Location This position is based in Speechify’s Cambridge office in the United Kingdom.

Our Mission Speechify aims to make information accessible through audio. The platform lets users listen to articles, documents, and books on their own schedule, at work, while commuting, or during downtime. Like streaming changed audio entertainment, Speechify is changing how people consume written content. The company leads its category and continues to grow rapidly. Role Overview The Senior Software Engineer, Core Experiences, joins a team responsible for the foundational services and SDKs that power Speechify’s product across multiple platforms. This position suits engineers who enjoy working where product and infrastructure meet, and who bring a strategic approach to designing APIs and systems that improve the user experience. What You Will Do Work closely with Product Teams to define project scopes, streamline feedback loops, solve integration and user experience challenges across teams, and deliver solutions through Speechify’s cross-platform SDK. Improve existing features by optimizing performance, reducing load times, and refining parsing through new abstractions and algorithm updates. Build and deploy cloud functions, lightweight backend services, and tasks using Kotlin. Location This role is based in Cambridge, MA, USA.