Principal AI/ML Engineer

Location: Cambridge, MA (Eastern Time / UTC -4) Relocation package available Relocation package: AvailableStart date: ASAPLanguages: English (required)About the RolePragmatike is seeking a highly skilled Principal AI/ML Engineer to join a rapidly growing AI startup recognized as a Top 10 GenAI company by GTM Capital, founded by researchers from MIT CSAIL.In …

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.

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-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.

Teamwork makes the stream work. Roku is revolutionizing the way the world experiences televisionAs the leading TV streaming platform in the U.S., Canada, and Mexico, Roku is dedicated to powering every television globally. We pioneered the streaming experience and are on a mission to connect the entire TV ecosystem. We link consumers to their favorite content, empower publishers to build and monetize vast audiences, and offer advertisers unparalleled opportunities to engage viewers.Your journey at Roku begins with impactful contributions. As a rapidly expanding public company, every team member plays a vital role. Join us in delighting millions of TV streamers worldwide while gaining invaluable experience across diverse fields. About This TeamThe Embedded teams focus on device firmware, platform features, and the integration of system-on-chip (SoC) components, emphasizing reliability, performance, and seamless user experiences across devices and TVs. About the InternshipJoin Roku’s embedded software team as a Software Engineer Intern, where your enthusiasm for technology and creativity will be pivotal to our success. This paid internship lasts for 12 weeks, starting in Summer 2026.As an Embedded Software Engineer Intern, you will tackle a specific project that enhances our embedded stack, such as implementing a new feature, improving performance, or developing automation enhancements to ensure the delivery of high-quality software across devices. Your ResponsibilitiesLead a project in the embedded sphere; possible tasks include implementing a feature, optimizing memory/performance, or creating automated tests for a system module.Utilize C++ on Linux-based systems; employ debugging and analysis tools to reproduce, isolate, and resolve issues.Collaborate with engineers across firmware, platform services, and quality assurance to ensure reliable delivery. Preferred QualificationsCurrently pursuing a degree in Computer Science, Engineering, or a related field.Proficiency in C++ (experience with modern C++ is a significant advantage).Familiarity with development and debugging on Linux-based embedded platforms.

Contract Type: Full-time, PermanentLocation: Cambridge, UKJoin Nu Quantum - Pioneering the Future of TechnologyAt Nu Quantum, we are leading the charge in the realms of quantum computing and advanced technology, fueled by our commitment to innovation, diversity, and excellence. Our environment fosters collaboration among brilliant minds from various backgrounds, all dedicated to redefining the limits of possibility.Founded to commercialize a decade's worth of research from the prestigious Cavendish Laboratory, Nu Quantum is on a transformative mission to revolutionize quantum information systems.Our team is working on groundbreaking technology aimed at enhancing the utility and expediting the time-to-market of quantum computing systems. We are integrating cutting-edge quantum photonic technology to establish a robust and scalable quantum networking infrastructure, forged in partnership with leading companies and academic institutions.About the RoleWe are in search of a Senior People Operations Manager who will be instrumental in evolving and strengthening Nu Quantum's People function amidst our rapid growth phase. Our success thus far has been rooted in the strength of our people and culture, and this position is pivotal in ensuring we continue to scale efficiently by developing strong, effective people processes and frameworks that empower our teams and leaders.In this senior, autonomous role, reporting directly to the Director of People, you will be the expert in People Operations, employee relations, and scaling people processes in high-growth environments.This position will act as a trusted escalation point for employee relations, providing confident, legally compliant, and pragmatic solutions. You will also spearhead the design, implementation, and delivery of People programs and processes, ensuring they are executed to the highest standards, enabling sustainable business growth.You will work closely with our People Generalist on compliance, policy, benefits administration, HR system integration, and operational initiatives, enhancing the team's capabilities as Nu Quantum expands.Key ResponsibilitiesPeople Operations & DeliveryLead the design, implementation, and continuous improvement of People processes, policies, and systems to support an evolving organization.Drive the end-to-end delivery of specific People initiatives, ensuring projects are completed efficiently and to a high standard without requiring direct oversight.Oversee benefits administration, HR reporting, and operational compliance.Collaborate with Talent Acquisition on onboarding processes, HR systems integration, and workforce planning initiatives.Utilize people data and metrics to identify trends, inform decision-making, and assist leaders in understanding organizational health.

Join Castle: The Innovative Finance App for Homeowners!At Castle, we empower homeowners to efficiently manage and track all their home expenses in one convenient platform. Our app not only simplifies payments but also identifies opportunities for savings. On average, our users save over $10,000.With housing affordability being a pressing issue in the U.S., we are committed to providing homeowners with superior data management for their most significant asset. Our mission is to create advanced payment infrastructure for the largest consumer sector in the country, helping people streamline and reduce their expenses.As a vital member of our engineering team, you will contribute to crafting simpler, smarter, and more intuitive experiences for our users. Working closely with our Head of Engineering, Head of Design, and fellow developers, you will help create a user-friendly application that demystifies home expense management and fosters long-term trust with our customers.This position is ideal for individuals who are eager to tackle complex challenges and keen on learning new technologies. You will play a key role in shaping a powerful product within an early-stage, high-growth company.

Join Luminance, the trailblazer in Legal-Grade™ AI for enterprises, and be part of a revolutionary journey in the legal industry. With the backing of esteemed venture capitalists and recognition as one of the 'Most Promising Private AI Companies in the World' by Forbes AI 50, as well as a spot on Inc. 5000’s list of 'Fastest Growing Companies in America', Luminance is transforming the legal landscape globally.We are on the lookout for innovative Software Engineers, Machine Learning Engineers, AI Engineers, or Data Scientists who possess a hacker mentality and a solid foundation in production-grade AI applications. Proficiency with Large Language Models (LLMs) like GPT, Claude, Mistral, etc., is crucial, particularly with experience in agentic environments.With ambitious growth plans ahead, we seek bright, passionate, and driven individuals to help us meet these exciting challenges. From day one, you will be developing features and tools for some of the world’s largest corporations, where speed and quality of execution are paramount.Your role will involve creating AI prototypes that integrate multiple components to effectively address complex tasks in intricate scenarios. You will also be responsible for incorporating cutting-edge agentic technologies (such as memory management and personalization) and transforming your solutions into reusable libraries and frameworks.If this opportunity excites you but your qualifications don’t perfectly match the job description, we still encourage you to apply. Your eagerness to learn and innovate is the most important asset we seek at Luminance!

Join alva-energy as a Senior Procurement Engineer, where you will play a pivotal role in the sourcing and technical procurement of essential equipment for large-scale steam-cycle power generation projects. This position melds engineering expertise with commercial strategy and supplier management. Collaborate closely with internal technical teams to define equipment needs, develop detailed specifications, and oversee competitive procurement processes while supporting contract awards and execution.This role is perfect for an accomplished engineer who has dedicated a significant part of their career to procurement within complex capital projects, with a solid understanding of how technical decisions impact costs, schedules, risks, and long-term operability.Key ResponsibilitiesCollaborate with mechanical, electrical, and project engineering teams to draft, review, and finalize technical specifications for major power generation equipment, including:Steam generatorsSteam turbines and generatorsFeedwater heatersCondensate and feedwater pumpsElectrical switchgear, transformers, and auxiliary electrical systemsOther balance-of-plant equipment as requiredDevelop and issue RFQs/RFPs for major equipment packages; manage bidder communications and technical clarifications.Conduct thorough technical and commercial bid evaluations, including compliance reviews, scope alignment, risk identification, and lifecycle considerations.Lead or assist in supplier selection recommendations and contract award packages in collaboration with legal, commercial, and project teams.Support commercial negotiations by translating technical scopes, guarantees, and exceptions into clear cost and risk implications.Coordinate with suppliers throughout design development, manufacturing, factory acceptance testing (FAT), inspections, and delivery.Interface with EPC contractors and vendors to manage scope boundaries, interfaces, and technical changes.

Your Role at Lila SciencesWe are on the lookout for exceptionally skilled Forward Deployed Engineers across various levels (Engineer, Senior Engineer, and Lead Engineer) to be a part of our dynamic team. Our FDEs are versatile professionals with a wide array of skills and specialized knowledge in one or more areas. This particular role in Physical Sciences demands a solid background in chemistry and materials science within an industrial manufacturing environment.As an FDE, you will work closely with our internal biotech and materials science teams as well as with external clients, immersing yourself in their challenges and swiftly developing solutions that enhance their research capabilities. You will utilize our AI and software platform tools to create custom features that cater to each customer’s specific needs. This role transcends conventional software development; it's a fast-paced, AI-driven engineering position where you will deploy production code in days rather than months.Your ContributionsCrafting, wrapping, and adapting specialized tools for data analysis, process optimization, molecular modeling, and more.Implementing tailored scientific workflows that connect with industrial instruments (PLCs, control software) and data systems (ERP, MES, SCADA).Establishing real-time data pipelines that convert complex scientific data into actionable insights.Designing user-friendly interfaces that make sophisticated AI/ML functionalities accessible to scientists.Engineering solutions that evolve from proof-of-concept to enterprise-wide implementation.

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.

KAYAK, a proud member of Booking Holdings (NASDAQ: BKNG), stands as a premier travel search engine, processing billions of queries to assist customers in discovering their ideal flight, accommodation, rental car, and vacation package. Our innovative corporate travel solution, KAYAK for Business, is redefining business travel.Joining KAYAK means becoming part of a dynamic travel organization that encompasses a variety of global metasearch brands, including momondo, Cheapflights, and HotelsCombined. Our journey from a startup to an industry frontrunner is fueled by innovation, and every team member is empowered to leave their mark. Our mission is to develop the most effective travel search engine, simplifying global exploration for everyone.We are seeking talented Java Backend Engineers to enhance and sustain KAYAK’s search and booking systems. If you are passionate about travel and committed to crafting reliable and user-friendly experiences, we invite you to apply.This position requires in-office work at our Cambridge, MA location at least 3 days a week.

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!

Teamwork makes the stream work. Join Roku in Revolutionizing TV ViewingRoku stands as the leading TV streaming platform across the U.S., Canada, and Mexico, with a vision to power every television globally. As pioneers in streaming technology, our mission is to connect the entire TV ecosystem. We bridge consumers with their favorite content, empower publishers to grow and monetize their audiences, and offer advertisers unique opportunities to engage viewers.Your journey with Roku begins with a meaningful contribution. As a rapidly expanding public company, we value proactive team members who thrive in a dynamic environment. Here, you will have the chance to delight millions of global TV streamers while gaining invaluable experience across diverse disciplines. About the TeamThe International TV Software team at Roku is dedicated to developing and delivering innovative software solutions for television platforms in international markets, particularly in Europe and Australia. Collaborating closely with SOC partners, the team aims to introduce new TV products, ensure compliance with regional broadcast standards, and support certification with organizations such as ETV, the BBC, and DTG. As a cross-functional team, we value engineers who are curious, adaptable, and eager to explore the complexities of the systems they work on.Your Role at RokuAs a Senior Software Engineer on the Regional TV Software team, you will play a pivotal role in developing and delivering software for regional TV platforms. Your responsibilities will include working on new TV platform initiatives, collaborating with SOC vendors, supporting certification processes with UK and European broadcasting organizations, and defining new software features. This position offers an excellent opportunity for engineers looking to advance their careers in a complex software environment.Your ResponsibilitiesDevelop and maintain software for regional TV platforms, focusing on European and Australian markets.Collaborate with SOC vendors and broadcasting organizations to ensure compliance and certification.Contribute to the design and implementation of new software features.

Join Roku, a leading streaming platform, as a Senior Software Engineer focused on enhancing our infrastructure, efficiency, and productivity. In this role, you will play a key part in architecting and developing innovative solutions that drive our technology forward. Collaborate with cross-functional teams to optimize system performance and ensure robust reliability in our services.

Join our dynamic team at Ramboll as a Structural Engineer specializing in building structures across multiple levels. We are seeking a passionate individual who is eager to tackle complex engineering challenges and contribute to innovative designs that enhance the built environment. You will collaborate closely with architects, contractors, and other engineering disciplines to ensure the successful execution of projects.Your expertise will play a vital role in delivering high-quality solutions, optimizing structural performance, and adhering to industry standards. This role offers the opportunity to work on a diverse portfolio of projects while advancing your professional development in a supportive environment.

At HyperLight, we are pioneering the commercialization of thin-film lithium niobate (TFLN) integrated photonics, a transformative technology that facilitates high-performance and scalable optical components across various fields including AI and datacom infrastructure, hyperscale computing, and quantum computing. Established in 2018 and supported by prominent venture capital, we are dedicated to advancing the mass deployment of TFLN photonics technology.Our flagship TFLN Chiplet™ platform represents a groundbreaking modular integrated architecture designed for scalability and manufacturability, ensuring seamless integration into complex systems. This platform provides an exceptional blend of performance and industrial readiness, allowing system developers to rapidly deploy our technology across diverse applications. We collaborate closely with our customers and suppliers throughout all phases—from conceptualization and design to prototyping and mass production—to ensure a smooth transition to TFLN photonic technology.We believe that our platform is a cornerstone in the golden age of integrated photonics, empowering humanity to reach new heights. Our world-class team comprises experts in engineering, business, and operations, all united by core values of integrity, innovation, collaboration, and practical solutions. Driven by a shared commitment to excellence, we embrace challenges with curiosity, humility, and a profound care for one another.Join us in making a significant impact in a dynamic, collaborative, and rapidly growing environment.

Join our innovative team as a PhD Mechanical Engineer - Technical Consultant, where you'll leverage your expertise in mechanical engineering to provide cutting-edge solutions in the Health Tech sector. Collaborate with multidisciplinary teams to drive projects that enhance healthcare technologies, ensuring they meet the highest standards of quality and efficiency.

ABOUT PIONEERING INTELLIGENCEPioneering Intelligence is a visionary organization that builds on Flagship Pioneering’s outstanding legacy of founding revolutionary science and computational ventures. By leveraging recent advancements in artificial intelligence, machine learning, and data analytics, we aim to expedite fundamental research and foster a portfolio of AI-first companies. As a key component of Flagship’s integrated model that combines science, entrepreneurship, and investment, we transform groundbreaking ideas into impactful companies, enhancing AI advancements across various sectors including human health and sustainability.Position SummaryWe are in search of a Senior Front End Engineer who will play a pivotal role in our early-stage initiative. In this position, you will architect and implement an unparalleled user experience for our new platform, which utilizes large language models (LLMs) and AI agents to optimize intricate, high-stakes workflows. This innovative, user-first, AI-augmented product will redefine abstract reasoning tasks, converting them into intuitive, high-performance tools that empower experts across a multitude of research fields. You will spearhead front-end development and work in close collaboration with engineers, AI scientists, product designers, and end users. This is a unique opportunity to shape the future of AI applications in research.

Join Luminance, a trailblazer in Legal-Grade™ AI for enterprises, and seize this incredible internship opportunity. Backed by prestigious venture capitalists and recognized in the Forbes AI 50 list as one of the ‘Most Promising Private AI Companies in the World’ as well as in Inc. 5000’s ‘Fastest Growing Companies in America’, Luminance is at the forefront of transforming the legal industry worldwide.We are on an ambitious growth trajectory and are continuously seeking bright, passionate individuals eager to contribute to our success. This internship offers you a unique chance to gain hands-on experience as part of our dynamic software engineering team at a fast-paced company. You will immerse yourself in the work from day one, collaborating closely with and being mentored by one of our skilled engineers.