Top Senior Full-Stack Engineer Jobs in NYC, NY

Lead a portfolio and team building cloud-based, full-stack systems and distributed microservices. Mentor engineers, collaborate with product managers, design and deliver scalable AWS solutions, and occasionally write or review code. Drive technology experimentation and participate in internal/external communities to meet regulatory and customer needs.

As a Full Stack Developer, you'll build cloud-native applications, develop scalable APIs, and implement CI/CD processes, while collaborating with cross-functional teams.

As a Senior Full-Stack Software Engineer, you will develop and enhance software platforms, focusing on backend services, APIs, and front-end applications, while mentoring junior developers and collaborating with cross-functional teams.

Design, build, and deploy cloud-native, agentic AI applications on AWS/GCP. Apply AI and automation to improve developer productivity, design and consume APIs, ensure security and compliance, support generative/agentic AI in production, collaborate in Agile teams, and contribute to architecture and engineering best practices.

Lead a team of developers and a portfolio of technology projects, building cloud-based full-stack solutions with distributed microservices. Collaborate with product managers, address regulatory needs, evaluate and contribute to code, mentor engineers, and adopt emerging technologies. The role uses JavaScript, Java, TypeScript, SQL, Python, Go, AWS, databases, Docker, and Kubernetes.

The Senior/Staff Full Stack Engineer will build and maintain child care management software, focusing on both backend and frontend development, while collaborating with cross-functional teams. Responsibilities include designing APIs, improving user experience, and managing technical debt.

Build and maintain full-stack Decision Intelligence products using React, TypeScript, Python, and SQL. Design and support REST APIs and backend integrations, create reusable components and prototypes, collaborate with product, design, and data science teams, and contribute testing, documentation, and deployment practices to deliver data-driven user experiences.

Responsible for scaling the consumer finance platform, improving API performance, integrating with third-party APIs, and enhancing user experience for millions of users.

The Senior Full Stack Engineer will design and develop features for the platform, maintain code, and collaborate across teams to improve engineering processes.

The Senior/Staff Full Stack Engineer will develop AI-driven products, enhance the advisor portal's functionality, and ensure system reliability using best practices in software and AI development.

The Senior Full Stack Engineer will build Fora's products and infrastructure, focusing on web development and collaborating with cross-functional teams to enhance the user experience for travel advisors.

As a Full Stack Software Engineer, you will build and improve user-facing products, collaborate with cross-functional teams, and design robust APIs.

As a Founding Senior Software Engineer at EliseAI, you will develop both frontend and backend applications, design APIs, and work closely with teams to build features that enhance user experience. The role requires ownership of projects and driving product development with a focus on efficiency and scalability.

Lead development of full-stack, cloud-native microservices and applications for Risk Tech GRC solutions. Mentor engineers, drive technical strategy, collaborate with product managers, and build AI-enhanced cloud solutions using modern languages, containers, orchestration, and databases.

The Full Stack Senior Software Engineer will design, implement, and ship features across frontend and backend systems, enhancing the Grow Therapy platform. Responsibilities include lifecycle ownership of work, improving core systems, resolving production incidents, writing maintainable code, and collaborating with cross-functional teams.

The Full Stack Engineer will design applications, enhance existing architecture, improve user experience, and utilize AI tools in a hybrid environment.

Lead full‑stack development for hedge fund technology: gather requirements, design and implement Java/Python/React applications, support AWS/Terraform infrastructure and RDS databases, drive AI‑assisted engineering practices, mentor engineers, integrate third‑party vendor systems, and ensure secure, scalable, test‑driven delivery.

Lead and mentor engineering teams to deliver cloud-based, full-stack microservices solutions. Collaborate with product managers, adopt new technologies, and occasionally write or review code to meet regulatory and customer needs.

Lead and mentor a team building scalable, resilient cloud-native fraud and disputes systems. Design and implement distributed microservices and full-stack solutions, collaborate with product and business stakeholders, contribute code, adopt modern cloud, container, database, and AI-assisted development tools, and ensure regulatory-aligned delivery.

Design, build, and maintain scalable backend services and APIs for commerce workflows using Python/Django. Improve reliability, performance, and observability, operate AWS deployments, work with PostgreSQL and event-driven architectures (SNS/SQS), modernize legacy systems, and support CI/CD, testing, and production troubleshooting.

Build and maintain React and Streamlit front-ends and FastAPI backends for analytics applications. Architect cloud-native services using Kubernetes (EKS), DynamoDB, Jenkins, and containerized CI/CD pipelines. Collaborate with data teams and stakeholders, lead code reviews, champion UI/UX best practices, and optimize platforms for scalability, security, and reliability.

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.

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.

Build and maintain React + TypeScript front-end applications, create prototypes, contribute reusable components and tests to shared libraries, integrate APIs and data services, and collaborate with designers, product, data scientists, and engineers to deliver data-driven decision intelligence products.