Top Senior Full-Stack Engineer Jobs in Boston, MA

Leads full-stack software engineering teams and technology portfolios supporting risk and GRC solutions. Responsibilities include managing developers, setting technical strategy, driving cloud-native distributed-system design, mentoring engineering leaders, partnering with product and architecture teams, defining roadmaps, and delivering large-scale initiatives. The role involves JavaScript and TypeScript ecosystems, multiple programming languages, AWS and other cloud platforms, microservices, databases, Kubernetes, AI-enabled solutions, and enterprise technical governance.

Leads software engineering projects and developer teams building distributed microservices and full-stack cloud solutions. Develops regulatory technology, collaborates with product managers, evaluates code, mentors engineers, and drives technology modernization using modern programming languages, databases, containers, orchestration platforms, and cloud services.

Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.

Build and ship customer-facing products across backend services, APIs, data models, React web interfaces, and Android point-of-sale applications. Learn unfamiliar platforms quickly, collaborate with product and design, deliver resilient code, and own testing, instrumentation, on-call support, and cleanup. The role emphasizes 0-to-1 product development, customer-focused decision-making, rapid experimentation, and using AI tools to improve development velocity and quality.

Leads software engineering projects and developer teams building distributed microservices and full-stack, cloud-based solutions for risk management and regulatory compliance. Responsibilities include coding and code evaluation, mentoring engineers, collaborating with product managers, adopting emerging technologies, and developing systems using Python, TypeScript, React, AWS, databases, Docker, and Kubernetes.

Build and scale WHOOP AI platform systems and member-facing experiences across the frontend and backend. Design scalable web applications, APIs, and intuitive interfaces; contribute to agent orchestration architecture; translate business requirements into reliable solutions; write tested code; and monitor, debug, and improve production performance and stability. Collaborate with product managers, designers, data scientists, and other cross-functional partners in a fast-paced environment.

Build scalable, data-intensive products from the ground up, focusing on Java/Kotlin backend services, REST or GraphQL APIs, data access, and React/TypeScript interfaces. Responsibilities include architecture, performance optimization, testing, observability, production troubleshooting, technical documentation, and end-to-end feature ownership. Collaborate with data, reporting, design, and product teams while using AI-assisted development tools to accelerate delivery.

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.

Leads technical vision and strategy for Affirm’s Marketplace, Search, Ads Platform, and consumer experiences. Designs scalable full-stack platforms, guides architecture and technical excellence, coordinates initiatives across engineering teams, mentors engineers, and drives reliable delivery of customer-focused products across iOS, Android, and Web.

Lead the technical vision and delivery of high-performance APIs and patient and provider web experiences using Ruby on Rails and React. Collaborate with Product, Design, and Engineering to deliver scalable features, improve development and testing standards, and balance user experience with maintainable code. Responsibilities include backend API architecture, frontend performance, automated testing, deployment pipelines, on-call support, and protecting user data.

Build and maintain high-quality full-stack SaaS applications for third-party risk management. Own loosely defined features from technical design through delivery, develop and optimize REST APIs, create modern web interfaces, write well-tested code, and collaborate with engineers and product owners in a continuous delivery environment.

Lead and mentor engineering teams to build distributed microservices and full‑stack cloud solutions for risk management. Collaborate with product managers, deliver scalable AI‑enhanced systems, and apply modern tooling (containers, databases, cloud).

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.

The Senior Fullstack Software Engineer will design, implement, and maintain features for Conveyor's SaaS platform, involving both backend and frontend work, while collaborating closely with team members and mentoring juniors.

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.

Designs, builds, tests, deploys, and optimizes full-stack product features using React and Python. Develops GraphQL integrations, scalable backend services, data visualizations, analytics instrumentation, and production-ready platform capabilities. Contributes to UX workflows, CI/CD, monitoring, code quality, and stakeholder updates while collaborating in agile sprints and evaluating new technologies.

Lead architecture and implementation of LangSmith platform features across Go, Python, and TypeScript. Collaborate with product, design, customers, and internal stakeholders to deliver scalable observability and evaluation capabilities. Write clean, tested code, design high-performance APIs, work with Postgres and Redis, and drive rapid project execution. The role requires strong fullstack engineering, communication, ownership, and customer engagement skills.

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.

Develop and maintain scalable web and mobile applications across front-end and back-end platforms. Build .NET and Angular solutions, write unit tests, document technical requirements, evaluate designs, support cloud-native architectures, collaborate with business and vendor teams, and communicate project status through leadership updates and technical demonstrations. The role focuses on performance, scalability, user experience, reusable components, and modern Azure technologies.

Lead technical direction and delivery for the Acquisition & Onboarding full‑stack team. Build and maintain mobile (React Native/native) and web experiences, backend services at scale, and operational tooling. Drive architecture, mentor engineers, ensure reliability/monitoring/on‑call readiness, collaborate with product and design, and improve dev processes, testing, and release practices to impact conversion and retention.

Design, build, and optimize scalable cloud and web software with focus on infrastructure, performance, and hardware integration for IoT devices. Collaborate with hardware teams to ensure connectivity and high availability, implement new features, and improve system efficiency.

Build and own scalable fintech products end to end, partnering with product, design, and data teams. Design high-performance, event-driven systems, integrate AI models and autonomous agents, instrument features, monitor business outcomes, and optimize user experiences. Work across React, TypeScript, React Native, Laravel, PostgreSQL, and AWS while influencing technical strategy, architecture, and product decisions.

Build and scale backend-focused systems supporting truckload freight operations, including high-volume carrier quotes, automated transactions, distributed services, and APIs. Design scalable data models and architectures, contribute across the React and TypeScript stack, make key technical decisions, mentor engineers, and collaborate with product leadership. The role also involves developing AI-powered logistics tools and maintaining reliable, secure infrastructure on Kubernetes and GCP.

Owner of Vannevar's authentication and authorization platform: build tenant-isolated auth systems, self-service user/group/permission admin UI, tooling to visualize and validate access, feature-flag and platform management interfaces, and shared authorization capabilities across products.

Senior fullstack engineer to build and scale Brigit's consumer finance platform. Own end-to-end features across frontend (React/React Native/TypeScript) and backend (Java/REST/SQL), optimize database and APIs for high scale, integrate 3rd-party services, implement risk and transaction algorithms, improve CI/CD, testing, monitoring, and internal tooling to support millions of users.