Principal Software Engineer Jobs in Boston, NH

About the OpportunityJob Description: The Research Software Engineer (Chemical Engineering) will conduct independent research and software development in the West Lab focused on the design implementation maintenance and extension of open-source scientific software for chemical kinetics thermodynamic...

Job Summary (Lead Software Engineer Platform Engineering) - Location: Hybrid must be local to Needham MA; Boston MA; New York City NY; Chicago IL; San Francisco CA; or Radnor PA - Type: W2 Role Summary of Responsibilities: - Design develop and maintain core platform services and APIs to support int...

Embark on a transformative journey as our Expert Consultant where intellectual rigor meets technological innovation. As an Expert Consultant you will blend your advanced analytical skills and domain expertise to provide strategic oversight to our human-in-the-loop and model-in-the-loop data pipeline...

Who we areZus is a shared health data platform designed to accelerate healthcare data interoperability by providing easy-to-use patient data via API embedded components and direct EHR integrations. Founded in 2021 by Jonathan Bush co-founder and former CEO of athenahealth Zus partners with HIEs and...

Be Klaviyos senior IC for scale you will report into a VP of Engineering and lead performance reliability multiregion and largetenant readiness. Youll drive platform-wide architectural change hunt bottlenecks and optimize systems and partner across teams to productionize improvements. Given that thi...

Who we areZus is a shared health data platform designed to accelerate healthcare data interoperability by providing easy-to-use patient data via API embedded components and direct EHR integrations. Founded in 2021 by Jonathan Bush co-founder and former CEO of athenahealth Zus partners with HIEs and...

Position Title: Senior Software EngineerAbout the Team: Profile data is the bedrock upon which Klaviyos entire product ecosystem is built. The Profiles Identity and Consent teams tackle massive distributed systems challenges operating at a breathtaking scalestoring tens of billions of records and pr...

Why You Should Join the Developer Infrastructure TeamOur core focus is empowering engineers to ship code efficiently and safely. We own the CI/CD pipelines and infrastructure automation that drastically improves developer productivity. As the Lead for this team you will define the technical roadmap...

Job Title: Senior Software Engineer - Java/React Duration: 1 Year Location: Boston MA (Remote) Job Description: We are seeking three high-caliber Senior Software Engineers to join a specialized team at our clients corporate headquarters in Burlington MA. This is a 12-month remote contract (w...

About the RoleKlaviyo is looking for a Full Stack Software Engineer II to join the Signup Forms team. On Signup Forms youll help rebuild and evolve one of Klaviyos core growth surfaces so brands can reliably capture high-intent profiles across web SMS and messaging channels.The team is explicitly fo...

We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building owning & scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort...

About the team:When you hear billing chances are you might think of a dusty corner office with several decade old file cabinets. Klaviyos Billing & Monetization team is not that! We oversee the payments and enforcement infrastructure that allow hundreds of thousands of companies to send billions of...

Team OverviewThe Infrastructure Security team makes it simple and easy for engineers to make secure choices while developing world-class software at high speed. Security is built in by defaultseamless and effortlessmaking engineers lives better and Klaviyo more secure.Our work sits at the intersecti...

Lead AI EngineerAt Klaviyo we believe the future of software lies not in productivity tools for human users but in systems that can learn run and optimize themselves based on measurable outcomes. Weve built the infrastructure and applications that power the interface between businesses and consumers...

As the Software Engineer Product Recommendations at Klaviyo youll help build the machine learningpowered systems that decide which products to show to whom and when across our platform. Youll work on large-scale backend and data systems that turn billions of behavioral events into real-time personal...

Why You Should Join the Editors Team:The Editors team is responsible for building common reusable components for the message editor. This team powers all the editors at Klaviyo. This team focuses on building intuitive and powerful interfaces to create highly customizable and dynamic content ranging...

About the RoleKlaviyo is looking for a Full Stack Engineer to support key initiatives that enhance our product offerings and drive company this role youll play a critical part in delivering end-to-end solutions using both front-end and back-end technologies. Youll improve existing products and deve...

Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building owning & scaling features end to...

Team OverviewThe Integrations team is responsible for building and maintaining Klaviyos integrations to a variety of 3rd party vendors. These vendors can be grouped across a number of industries such as ecommerce point of sale payment processing advertising and order to enable our customers to inte...

Why You Should Join the Channel Processing TeamThe Channel Processing team has direct technical responsibility for Klaviyos most-used engagement product. It is responsible for designing building and operating highly-scalable highly-available distributed systems to process ever-increasing campaign tr...