Top Senior Full-Stack Engineer Jobs in Boston, MA

Lead the development and technical direction of fullstack applications, ensuring high quality, performance, and security while collaborating with cross-functional teams and mentoring other engineers.

The Senior Fullstack Engineer will build foundational product features and integrations to drive user acquisition, optimization, and monetization at LangChain, collaborating with various teams for growth.

Lead the technical architecture and implementation for LangSmith, collaborating with teams, mentoring juniors, and ensuring code quality.

As a Senior Software Engineer, you'll implement collaboration features, support team architecture, work across tech stacks, and improve developer experience.

The Senior Fullstack Engineer will design, build, and maintain features for Clarium's AI-powered healthcare platform, collaborating with cross-functional teams to enhance efficiency.

As a Full Stack Engineer, you'll develop production-ready AI and ML features, build APIs, design scalable systems, and implement frontend solutions using Angular.

Lead the design and development of scalable SaaS platform solutions while producing and enhancing applications in the SaaS ecosystem using full-stack development practices.

Design and implement AI-powered backend systems for media experiences in Dropbox, collaborating with cross-functional teams, and influencing technical decisions.

Rapidly triage and resolve customer-reported full‑stack bugs across 3D visualization, report/PDF generation, and databases. Independently investigate unfamiliar codebases, implement tested fixes, ensure performance integrity, collaborate with CSE to prioritize and deploy fixes, and reduce backlog velocity.

Build enterprise-grade features for multi-location customers: frontend React+TypeScript interfaces, admin consoles, backend APIs, SSO/RBAC security, multi-tenant PostgreSQL architectures, and well-tested, maintainable code.

As a Full Stack Engineer, you will build features from database to UI, implement integrations, ensure stability, and improve the platform with a focus on technical excellence and user experience.

The Senior Full-Stack Developer will create software solutions jointly with clients, ensuring high-quality code and effective collaboration with the team.

Lead modernization of a legacy .NET/SQL Server payment-integrity platform: migrate services to modern .NET, design reliable RESTful APIs, improve database performance, implement security and observability, and use AI agents to accelerate refactors and testing while partnering with product, UX, DevOps, and QA to ship high-quality features.

The role involves building and scaling a core product, owning major features, and influencing architecture in a healthcare AI startup while ensuring security and ethics.

Design, develop, and maintain scalable applications, focusing on front-end with React, while contributing to APIs and backend systems.

The Senior Full Stack Engineer will architect and ship scalable features, mentor teammates, and collaborate on improving the rental platform experience for users.

Lead development initiatives for SaaS products, focusing on backend architecture, frontend design, and AI/ML integrations, especially generative AI technologies.

The role involves shipping full-stack AI projects, designing experiments for AI features, and optimizing AI infrastructure while collaborating with teams.

Design, develop, and maintain scalable web applications, mentor junior developers, optimize performance, and ensure best practices in coding.

Design, build, and scale data integrations for healthcare systems, collaborating with teams and enhancing functionality while ensuring security and quality.

The Senior Full Stack Software Engineer will oversee technical development in a B2B SaaS healthcare environment, mentor junior engineers, and lead product features.

The Senior Fullstack Engineer will autonomously deliver impactful software solutions, collaborating with various teams to innovate and scale the product, ensuring quality across development processes.

Design, build, and maintain scalable web applications using React.js and Node.js with TypeScript. Collaborate with cross-functional teams to deliver features, optimize performance, ensure security, automate deployments with DevOps, write tests, and participate in code reviews.

As a Senior Full Stack Engineer, you'll design and scale core features for Calendly's AI Notetaker, lead feature implementation, and mentor team members.

The Tech Lead/Full Stack Engineer will design core features, support system architecture, mentor junior engineers, and lead technical initiatives at Calendly.