Mid-Level Full-Stack Software Engineer (C#/.NET, React)

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 Cambridge Mobile Telematics (CMT), the largest telematics service provider globally, dedicated to enhancing road safety. Our innovative AI-driven platform, DriveWell Fusion®, integrates sensor data from millions of IoT devices, including smartphones and connected vehicles, with contextual information to deliver insights that empower auto insurers, manufacturers, and public sector organizations to improve risk assessment and driver safety. With our headquarters in Cambridge, MA, and global presence across cities like Budapest, Chennai, Seattle, Tokyo, and Zagreb, we protect millions of drivers daily.We are on the hunt for a talented Principal Software Engineer who possesses deep expertise in full-stack development. In this pivotal role, you will lead intricate projects, mentor teams, and contribute to the technical evolution of our platform, driving its ongoing success.If you are a collaborative, innovative thinker passionate about making roads safer through technology, we invite you to apply!

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.

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.

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.

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.

POS-9034About Our TeamThe Commerce Hub at HubSpot is revolutionizing how businesses sell, bill, and manage revenue seamlessly within our platform. Handling billions in customer transactions, our focus on accuracy, clarity, and reliability is paramount. We are developing an AI-first commerce ecosystem that integrates flawlessly with HubSpot’s CRM, offering a streamlined, consistent, and adaptable experience for both sellers and buyers.About the RoleWe are in search of a Principal Software Engineer to drive the technical evolution of Commerce Hub. This pivotal role demands hands-on involvement, where you will engage in coding, exploring services, evaluating complex designs, troubleshooting intricate systems, and taking ownership of the architecture for critical components in CPQ, Billing, Payments, and Revenue OS.Your ResponsibilitiesDevelop a Cohesive, Scalable PlatformInfluence the technical roadmap for CPQ, Billing, and Payments using strong, decisive patterns.Define and enhance core domain models to ensure consistent and predictable behavior for pricing, products, contracts, invoices, and payments.Create frameworks that facilitate easy extensions without increasing complexity.Be a Proactive, Impactful BuilderRegularly write code, lead design reviews, and construct impactful systems from start to finish.Manage extensive multi-team projects that encompass CPQ, Billing, and Payments.Transform prototypes into scalable production-ready solutions.Guide Architectural DirectionEstablish patterns for extensibility, contract boundaries, financial accuracy, event-driven consistency, and safe interactions between AI/agents and commerce objects.Advocate for simplicity in complex domains while maintaining consistency across surfaces.Collaborate Closely with Product LeadershipShape product strategies across CPQ, Buyer Portal, and Revenue OS.Assist teams in navigating trade-offs between speed, accuracy, compliance, and long-term platform sustainability.Elevate Organizational StandardsMentor senior engineers and technical leads.Drive informed design choices and facilitate learning from incidents and significant migrations.Encourage teams to align on best practices and strategic goals.

Join Cambridge Mobile Telematics (CMT), the world's leading telematics service provider, dedicated to enhancing road safety and improving driver behavior. Our cutting-edge AI platform, DriveWell Fusion®, integrates sensor data from millions of IoT devices—including smartphones, proprietary Tags, connected vehicles, dashcams, and third-party devices—melding it with contextual information to deliver a comprehensive analysis of vehicle and driver interactions. Our insights empower auto insurers, automotive manufacturers, mobility companies, and public sector organizations to optimize risk assessment, safety protocols, claims processing, and driver improvement initiatives. Based in Cambridge, MA, with global offices in Budapest, Chennai, Seattle, Tokyo, and Zagreb, CMT actively monitors and safeguards millions of drivers worldwide every day.As a Principal Software Engineer within our Trip Processing team, you will play a crucial role in delivering innovative technical solutions at the core of our advanced telematics pipeline. Collaborating closely with product and research teams, you will design, develop, and implement new features while mentoring junior engineers and enhancing our codebase. Your contributions will be vital in upholding our high standards of software quality to meet the expectations of our insurance partners.We seek a collaborative, customer-focused, and imaginative Principal Software Engineer II - Backend who is eager to help make roads safer and drivers more responsible!

POS-4092 Team and Product Focus The Data Hub team at HubSpot connects scattered data sources to deliver practical insights for Revenue Operations, marketing, sales, and customer teams. By integrating information from various channels and tools, the team improves data quality and makes this data actionable within HubSpot. This enables teams to run AI-powered demand generation, optimize campaigns, and produce reliable reports, without requiring deep expertise in data systems. Product engineering here blends data engineering, machine learning, applied AI, and market strategy. The group prioritizes reliability, cost efficiency, and scalability, while always considering usability for marketers and sales professionals. Role Overview HubSpot is seeking a Lead Principal Software Engineer to steer the next phase of Data Hub's development. This platform is evolving into the central engine for data-driven demand generation company-wide. Key Responsibilities Take ownership of critical components in the data lake and analytics architecture, working with technologies such as Iceberg, Spark, and both batch and streaming data pipelines. These systems underpin large-scale demand generation, segmentation, and scoring. Design and refine data systems to achieve the right balance between cost, latency, data freshness, and reliability. Apply principles like the CAP theorem, efficient partitioning, and thoughtful storage layout to guide decisions. Collaborate closely with Product Management, product analytics, and go-to-market leaders to deliver solutions that drive business outcomes: improved lead scoring, enhanced funnel visibility, audience segmentation, and campaign attribution for marketing and sales. Contribute to transforming Data Hub into an AI-powered platform, aiming for curated, always-available datasets that support AI agents and reporting tools, eliminating the need for manual integrations or custom pipelines. This is a hands-on principal engineering position. The role involves building systems, working alongside product and design, and amplifying the impact of HubSpot's broader engineering community.

Your Role at Lila Sciences Lila Sciences is on the lookout for an experienced Principal Software Engineer specializing in Instrument Simulations. In this pivotal position, you will spearhead the architecture and development of our cutting-edge laboratory automation platform. Your expertise will be crucial in designing the simulation framework and integration layer that links AI-driven experimental design with physical robotic systems, enabling groundbreaking scientific discoveries at an unparalleled scale. Key Responsibilities Design and implement high-fidelity simulation environments that accurately model intricate laboratory instrumentation, fluidics, and robotic processes. Establish and maintain robust integration frameworks between diverse hardware systems, ensuring the safe and reliable execution of fully automated experiments. Lead the development of APIs and interfaces to facilitate seamless interaction between scientists and AI agents with complex automation infrastructures. Champion best practices in hardware-software integration, system monitoring, and continuous integration/deployment (CI/CD) within laboratory automation contexts. Provide mentorship to engineers, likely overseeing a small, agile team.

POS-31591About Our TeamThe Prospecting Solutions team is revolutionizing the way B2B SMB and mid-market sales teams cultivate their pipeline. The current outbound sales approach is often inefficient and outdated, with representatives dedicating excessive time to research, tool integration, and uncertain contact strategies. Our focus transcends mere outreach execution; we prioritize intelligent sourcing, prioritization, and trust.This team is developing a comprehensive, signal-driven prospecting ecosystem that aligns with contemporary B2B purchasing behavior: account-centered, aware of buying groups, and trust-oriented. Our mission is to merge human discernment with automation, enabling sales teams to generate consistent, high-quality pipeline without compromising their brand integrity or their representatives' well-being.About the RoleWe are seeking a Principal Software Engineer to serve as a pivotal technical leader for Prospecting Solutions. This role is highly hands-on, perfect for an innovator who excels in dynamic, product-defining environments.As a Principal Engineer within our team, you will play a crucial role in shaping how data, AI, and workflows converge to facilitate intelligent prospecting at scale. You won't just follow a roadmap; you will help craft it, transforming ambiguous challenges such as “who should I contact next and with what message?” into robust, transparent, production-grade systems utilized by millions of sales professionals.Key ResponsibilitiesDesign signal-driven prospecting systems: Define the integration of intent signals, firmographics, behavioral insights, and CRM context to create actionable prioritization and recommendations.Hands-on, impactful developer: Write production-quality code, steer complex projects from conception to completion, and scale prototypes into full-fledged systems.AI and systems integration: Guide the integration of machine learning and generative AI models into deterministic workflows, balancing efficiency with transparency and user trust.Influential technical leadership: Shape not only the construction of the product but also its vision, collaborating closely with Product to define interfaces, workflows, and necessary trade-offs.Extensibility focus: Design systems capable of functioning across diverse accounts, buying groups, and regions while ensuring adaptability and ongoing evolution.Cross-department collaboration: Work collaboratively across CRM, data, AI, and GTM teams to synchronize patterns and avoid localized optimizations.Elevate technical standards: Foster a culture of excellence in engineering practices and innovation.

Your Contribution at Lila Sciences Lila Sciences is seeking a passionate Software Engineer to spearhead the development of cutting-edge Lab Instrument Integration Software, a crucial element of our AI-powered laboratory ecosystem. We want innovative thinkers who thrive at the intersection of software, science, and hardware, delivering impactful solutions that propel scientific advancements. Key Responsibilities Lab Instrument Software Development: Design and implement reliable software that facilitates seamless communication between robotic systems and automation hardware (e.g., robotic arms, liquid handlers, sensors) and control software, guaranteeing effective hardware integration. System Integration: Integrate lab instruments into our next-gen AI-driven lab automation framework, managing intricate connections between cloud and edge infrastructures, along with device execution. Testing and Debugging: Conduct comprehensive testing, debugging, and troubleshooting of drivers to pinpoint, isolate, and resolve performance issues, bugs, and compatibility hurdles. Technical Documentation: Develop, revise, and maintain thorough documentation for driver interfaces, APIs, and integration procedures, ensuring clarity for internal teams and end-users. Collaboration and Support: Partner with cross-functional teams, including hardware engineers, software developers, product managers, and end-users, to provide technical assistance and resolve integration challenges efficiently. AI-Driven Development: Leverage advanced coding models and development tools to enhance the speed and quality of software delivery. Qualifications for Success Proficiency in Python, C#/.NET, or other programming languages/frameworks is essential. Proven experience in debugging and problem-solving, particularly in hardware-software integration contexts. Strong analytical skills and a methodical approach to troubleshooting complex technical challenges. Excellent verbal and written communication skills to facilitate effective collaboration within multidisciplinary teams. Bonus Qualifications A keen interest or background in science. Experience in developing software for laboratory instruments.

Join our dynamic team at Ramboll as a Senior / Principal Electrical Engineer. In this role, you will lead innovative projects, collaborate with a talented team, and contribute to the development of sustainable electrical solutions. Your expertise will be pivotal in driving forward our commitment to excellence in engineering.

At Cambridge Mobile Telematics (CMT), we are the leading telematics service provider globally, dedicated to enhancing road safety and improving driver performance. Our innovative AI-driven platform, DriveWell Fusion®, integrates sensor data from millions of IoT devices—including smartphones, proprietary Tags, connected vehicles, dashcams, and third-party devices—providing a comprehensive view of driver and vehicle behavior. Our insights empower auto insurers, automakers, commercial mobility firms, and public sector entities to refine risk assessment, safety measures, claims processing, and driver enhancement initiatives. With our headquarters in Cambridge, MA, and additional offices in Budapest, Chennai, Seattle, Tokyo, and Zagreb, CMT is committed to safeguarding and measuring the journeys of millions of drivers every day.We are currently seeking a dynamic and innovative Principal Software Engineer specializing in Android to join our mission of making roads safer and drivers better. This pivotal role as a principal-level individual contributor on our Android SDK team emphasizes deep technical ownership, cross-functional leadership, and strategic architectural guidance for CMT's Android SDK platform.

Role Overview Lila Sciences is seeking a Principal Engineer with expertise in AI Security for its Cambridge, MA office. This senior individual contributor will help define and drive the technical strategy to secure AI applications across the organization. The role involves close collaboration with IT and business teams to ensure AI tools and platforms are implemented safely and in compliance with internal and external requirements. Securing both third-party and in-house AI tools is central to this position. The work will focus on protecting sensitive data, intellectual property, and scientific processes as AI becomes increasingly embedded in Lila's operations. What You Will Do Enterprise AI Security Strategy: Develop and roll out security controls and guidelines for using AI tools throughout the company, covering LLM APIs and SaaS AI platforms. AI Gateway & Agentic Gateway Security: Design and enforce controls for AI gateways, monitoring and managing access to AI systems. Ensure agentic workflows are secured with strong identity and authorization measures. AI Red Teaming & Adversarial Testing: Lead red teaming and adversarial testing efforts to uncover vulnerabilities in AI usage, such as prompt injection and data exfiltration risks. Data Protection for AI Usage: Establish and maintain safeguards to prevent sensitive data exposure through AI systems, with a focus on input/output filtering and secure data management. Multi-Layer AI Security: Integrate AI security practices with the organization's broader security framework, maintaining visibility and control over AI service access and data flows. AI Threat Modeling: Build and maintain threat models tailored to enterprise AI applications, addressing risks like data leaks and unauthorized agent actions. Vendor & Platform Security: Assess and advise on secure integration of third-party AI vendors, with close attention to their data handling practices and model behavior.

Join Lila Sciences as a Staff or Principal Engineer specializing in Technical Mitigations Research. This role offers an exciting opportunity to leverage your engineering expertise to develop innovative solutions in the field of technical mitigations.