Top Senior Full-Stack Engineer Jobs in NYC, NY

The Senior Full-Stack Engineer will develop web applications using modern frameworks, create endpoints, maintain code quality, and collaborate on features through the complete lifecycle.

The role involves collaborating with product management and quality assurance teams to design and implement features for web-based investment/trading applications, focusing on building and maintaining high-quality code and APIs, while supporting production environments.

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 Fullstack Engineer will build and manage enterprise authentication systems, improve user session management, ensure security compliance, and support internal API usage across services, while enhancing performance and reliability.

Design, build, deploy, and optimize scalable full-stack applications integrating databases, APIs, and AI/LLM workflows. Lead architecture, CI/CD (ArgoCD, GitLab), Airflow pipelines, and collaborate cross-functionally to deliver production-grade fintech solutions.

Design, develop and deliver full stack applications using Java, AngularJS, and SQL, while collaborating in engineering pods through the software development lifecycle.

Build and scale AI agent platform and tools, prioritize feature development, and manage backend services and integrations with CRMs.

As a Senior Full Stack Engineer, you will design and develop scalable APIs, integrate financial data, and enhance user experience in a collaborative environment.

The Senior Full-Stack Engineer will build and maintain scalable backend services and frontend applications while collaborating with teams to deliver high-quality solutions in AI-driven health and wellness.

As a Senior Fullstack Engineer, you'll contribute to backend development for Toast's New Ventures team, collaborating on architecture and launching MVPs while addressing unmet operator 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.

The Software Engineer will architect and build front-end experiences, collaborating with experts to design solutions and ensuring high-performance user interfaces.

The Staff Software Engineer will lead backend system design, improve data platforms, mentor engineers, and drive technical direction in Agile development environments.

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

Develop end-to-end product features, lead projects, shape technical systems, and mentor teammates while collaborating with cross-functional teams.

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

Lead engineering efforts at Headway, designing software architecture, mentoring teams, and shaping technical requirements to build a mental health care platform.

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.

The Senior Full Stack Engineer will build and scale the performance marketing platform, focusing on both front-end experiences and backend APIs, while collaborating cross-functionally and mentoring junior engineers.

The Senior Full-Stack Developer will design, build, and maintain AIO Logic's cloud-based AXIS platform, utilizing React and Java/Spring Boot to deliver software solutions for complex financial workflows, collaborating with cross-functional teams, and mentoring junior developers.

Lead diverse technology projects and a development team to create solutions for regulatory needs, while collaborating with product managers on cloud-based systems.

As a Senior Fullstack Engineer, you'll develop and maintain scalable APIs and web applications, engage with customers to meet their needs, and collaborate on product features to improve Layer Health's applications.

Lead full-cycle projects impacting millions and collaborate with product and UX teams to define requirements and execute development plans.

Lead development and scaling of the StashWorks B2B fintech platform. Own product roadmap, deliver end-to-end features, instrument and test systems, deploy to cloud infrastructure, and leverage AI tools to accelerate development while ensuring security, reliability, and platform maturity.