Top Senior Full-Stack Engineer Jobs in Boston, MA

Own and evolve an internal portfolio management and decomposition platform. Build full-stack applications and backend systems for high-performance data processing, attribution, and reporting. Collaborate with PMs, quants, and engineers to deliver scalable, cloud-ready tools that support real-time investment decision-making and improve the investment process.

The role involves leading the development of a full-stack platform for biopharma, focusing on architecture, UX, backend services, and API integrations, while ensuring reliability and collaboration with cross-functional teams.

Design, build, and maintain full‑stack features for a clinical SaaS platform. Drive architecture, collaborate with product, ML, infra, and regulatory teams, uphold engineering standards, mentor peers, and ensure reliability, data integrity, and compliance for clinical trial workflows.

Responsible for leading a team of engineers, supporting product development, identifying technical issues, and ensuring high-quality code delivery in backend systems at scale.

Design, build, and operate production-grade Java-based enterprise applications and microservices. Implement RESTful APIs, front-end features with React, and relational database schemas and tuning. Deploy and manage applications on AWS/Azure/GCP using CI/CD, containerization, and observability practices. Perform debugging, troubleshooting, and root-cause analysis; contribute to architecture and DevOps practices.

Senior technical leader responsible for end-to-end architecture and technical direction of a performance measurement and attribution calculation platform. Own cross-cutting design, lead cross-team integration, prototype and adopt AI/ML, mentor senior engineers, and write code for the hardest problems to ensure performance and correctness at scale.

Design, develop, test, and maintain firmware, user interfaces, PC applications, and web services for machine vision sensors. Lead scrum stories, drive design reviews and code quality, mentor junior developers, integrate core vision features, debug customer issues, and collaborate with product, marketing, and support teams to meet milestones.

Lead design and implementation of the PSA Liquidity Platform connecting buyers and sellers. Build buyer tooling, matching/ranking engines, and seller experiences. Architect and operate microservices and Kafka-driven systems on Kubernetes/AWS, instrument observability, apply AI tooling across the SDLC, and drive cross-functional delivery from 0-to-1 while owning end-to-end outcomes.

Design, develop, test, deploy, and maintain full‑stack web applications. Build front-end interfaces, back-end logic, APIs and databases; troubleshoot accessibility and performance; integrate with Salesforce; create automated tests, prototypes and documentation; participate in code reviews and continuous improvement.

The Senior Full-Stack Engineer will manage client relationships, design integration solutions, and ensure seamless delivery and optimization of technical workflows, while leveraging AI for efficiency.

As a Full Stack Engineer III at Calendly, you'll develop features, scale the platform, and mentor team members while using various technologies.

Design, develop, and maintain scalable web applications using React front ends and .NET 8 back ends. Build RESTful APIs and microservices, implement CI/CD with GitHub Actions, troubleshoot performance issues, participate in architecture and code reviews, and mentor junior engineers while collaborating with cross-functional teams.

Design, build, and operate customer-facing features for a React+Vite portal and the AWS backend services that power it. Lead TypeScript migrations, optimize performance, create reusable design-system components, and maintain unit and BDD/e2e tests (Playwright/Cypress). Implement IoT communication (MQTT, WebSockets, AWS IoT Core), event-driven architectures (SQS, SNS, EventBridge), and CI/CD pipelines. Instrument services for observability and collaborate across product, design, firmware, and hardware teams.

The Senior Full Stack Engineer will build platform integrations, work across the full stack, shape product architecture, and collaborate cross-functionally to enhance digital experiences.

Build and ship end-to-end features across a TypeScript/Next.js monolith: dashboard, marketing site, billing, email, and AI-assisted tools. Own data models, APIs, third-party integrations, testing, observability, and production quality. Collaborate with the founder, review code, and improve engineering practices while delivering customer-facing features rapidly.

Lead design and implementation of end-to-end product features, drive technical decisions, use AI tools to accelerate development, support teammates through code reviews and standards, and continuously improve architecture, tooling, testing, and developer experience to deliver reliable production software for financial advisors.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Design, build, and maintain AI-powered B2B SaaS products across frontend, backend, and AI. Own projects end-to-end, collaborate with product and design, ensure maintainability, mentor teammates, and inform roadmap and implementation decisions.

Lead architecture and implementation of scalable web applications using NestJS and Next.js. Build and optimize PostgreSQL schemas and queries, implement responsive UIs with Tailwind CSS, integrate LangChain-driven AI features, manage authentication with Clerk, and create end-to-end tests and automation with Puppeteer to ensure launch readiness and reliable user experiences.

Senior full‑stack engineer responsible for building backend services (Node.js/TypeScript) and integrating with frontends (React/Vue). Ship production APIs, collaborate cross‑functionally, own delivery, mentor peers, and develop modular, testable, performant systems across diverse greenfield projects.

Founding-team senior engineer to architect and build core platform components. Work with CEO/CTO to develop scalable distributed backend systems and frontend using React, Node.js and TypeScript. Implement solid coding practices, testing, CI/CD, and agile workflows while iterating rapidly in an early-stage fintech startup.

Lead the development of Coperniq's platform by designing, developing, and maintaining scalable full-stack solutions while collaborating with teams and mentoring juniors.

The Senior Software Engineer will own the development of full-stack features from UI to backend, mentor junior engineers, and drive technical decisions.

The Senior Full Stack Java Developer will design and maintain enterprise applications using Java and modern front-end technologies while collaborating in Agile teams and mentoring junior developers.

As a Senior Fullstack Software Engineer at Vanta, you will lead complex projects, set technical direction, design and develop new functionalities, and contribute to the engineering culture while mentoring other engineers.