Top Senior Full-Stack Engineer Jobs in Boston, MA

Design and build features across a React/TypeScript frontend and Go backend for real-time dispatch systems. Implement WebSocket-driven tracking, GIS integrations, multi-tenant architectures, performance and state management improvements, production debugging, and collaborate with Product and Operations to deliver agency commitments.

As a Senior Full-Stack Engineer, lead design and development of complex search features, optimize development processes with AI tools, and mentor juniors in a collaborative environment.

Own and ship end-to-end full-stack features for a high-scale, AI-native publishing marketplace. Design APIs, optimize queries, deploy cloud-native apps, build LLM-powered capabilities, ensure security and privacy compliance, mentor engineers, influence architecture, and maintain reliability and performance under load.

The Senior Full-Stack Engineer will design, implement, and maintain systems for Trading API customers, focusing on both frontend and backend development, while leading projects and mentoring peers.

Design, build, and maintain backend applications, microservices, and APIs; implement third-party integrations; ensure security, testing, and documentation; deliver client-facing features; collaborate with product and business stakeholders; estimate scope/timelines; work across the stack to create scalable, high-performance systems.

Lead consolidation and modernization of two legacy giving marketplace applications into a single scalable stack. Re-architect, refactor, and optimize back end (Java, Spring Boot, Hibernate) and front end (Angular, NgRx, SCSS). Implement features, ensure UI/UX feasibility, address performance and scalability, conduct code reviews, and collaborate with the team to deliver a robust application.

Design, develop, and maintain web applications and RESTful APIs using Java/Spring Boot. Develop and maintain PL/SQL stored procedures and Oracle database logic. Participate across the SDLC, troubleshoot backend and database issues, collaborate with cross-functional teams, and improve development processes and tooling.

Lead full‑stack development of enterprise web and middle‑tier applications for financial advisors using Angular/TypeScript and Java/Spring. Design, implement, test, and deploy features in an Agile Scrum team, driving CI/CD, cloud (AWS) deployments with Docker, Kubernetes, and Terraform, while mentoring engineers and collaborating with business stakeholders.

Design, develop, and maintain web applications using Java/Spring Boot backends and Angular frontends. Build RESTful APIs, write clean maintainable code, participate across the SDLC, collaborate with cross-functional teams, troubleshoot full-stack issues, and help improve development processes and tools.

Design, develop, and maintain full-stack web applications using Java/Spring Boot backends and Angular frontends. Build RESTful APIs, write clean code, collaborate with cross-functional teams, troubleshoot issues, and participate across the SDLC.

Develop consumer-centric web applications, enhance usability, collaborate with designers, implement backend software and APIs, write tested code, and follow agile development cycles.

Build and ship complex consumer-facing full stack applications. Work on React/TypeScript frontends (offline PWAs using IndexedDB/DexieJS and Workbox) and Scala/Play backends with PostgreSQL. Deploy on AWS via Kubernetes. Mentor engineers, collaborate in product-focused cycles, and thrive in a fast-moving startup environment.

The Senior Full Stack Engineer will design, build, and scale healthcare integrations, ensuring high security and quality, while collaborating with cross-functional teams and supporting enterprise-level integrations.

Design, architect, and build full-stack web applications and AI-powered solutions integrating LLM APIs, RAG pipelines, vector databases, and agentic frameworks. Lead code reviews, mentor engineers, support PoC engagements, and maintain cloud-native, containerized deployments with CI/CD best practices. Advocate AI-augmented engineering workflows and produce technical documentation for ATC lab environments and customer-facing prototypes.

The Sr. Full Stack Developer will design and build full-stack applications, focusing on AI-powered solutions, and lead code reviews while mentoring junior engineers in the Advanced Technology Center.

Own end-to-end product verticals across frontend and backend: real-time voice/chat, billing and payments, communications, service-provider workflows, and platform features. Design and implement robust APIs, data models, payment integrations, multi-tenant billing, and notification systems while driving architecture, testing, and production quality.

Develop fullstack web applications, enhance platform performance, collaborate on high-impact opportunities, and ensure stable, scalable solutions. Engage in rapid iterations and be a committed team player.

Build and operate end-to-end premium purchasing and subscription systems (Stripe, Apple/Google IAP, payments). Own projects from design through rollout and reliability, instrument observability, debug production, define metrics, mentor engineers, and drive technical direction and standards.

Lead frontend-leaning full-stack implementation work for carrier and enterprise integrations: architect reusable UI and API layers, author RFCs, guide technical delivery, enforce testing and security best practices, and partner with cross-functional teams to scope and ship production integrations.

As a Senior Software Engineer in ZT1, you will lead backend system development, manage projects, and influence product direction in a fast-paced, AI-centric environment.

The Senior Full-Stack Engineer at SafeRide Health will develop and maintain healthcare applications, ensuring high performance and security while collaborating with cross-functional teams in an agile setting.

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.

Deliver and scale full‑stack product features end-to-end: design and implement frontend and backend systems, align architecture, collaborate with product/design/data/QA, estimate work, ensure SDLC quality, communicate status, and participate in on-call rotation.

Lead modernization of dtn.com as a senior full-stack engineer—improving architecture, performance, accessibility, and integrations. Build responsive front-end experiences and back-end APIs, integrate CMS/CRM/analytics, optimize conversion and SEO, and establish engineering best practices to support marketing, content, and demand-generation goals.

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