Top Senior Full-Stack Engineer Jobs in NYC, NY

We're seeking a Senior Full Stack Engineer to develop LLM-powered tools, drive product decisions, and shape the engineering culture. Responsibilities include building frontier products, voice-to-voice survey tools, a mobile app, and an AI native CRM system.

The Senior Full Stack Engineer will develop backend services, manage databases, implement APIs, and ensure system reliability while collaborating with cross-functional teams to deliver high-quality features in a fast-paced startup environment.

As a Senior Full Stack Engineer, you will develop AI-enhanced solutions, collaborate with teams, and optimize learning experiences using various technologies.

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.

Lead a team to design and build AI-native engineering harnesses and agentic workflow orchestration for governed model use. Implement typed contracts, observability, CI/CD integration, evaluation gates, developer tooling, and cloud-native services to enable secure, auditable, and repeatable AI-assisted software delivery across the enterprise.

As a Senior Fullstack Engineer, you will own product features from design to launch, build backend APIs, and integrate AI tools while collaborating with a small, dynamic team.

Build and scale an AI agent platform and internal tools; ship end-to-end features; own backend services, APIs, and CRM integrations; collaborate with customers to prioritize features and operate in an early-stage startup environment.

As a Senior Full-Stack Engineer, you will build applications for clinical operations, design APIs, implement real-time interfaces, and collaborate with teams on patient data management.

Build and maintain fullstack messaging and communication features for Recura, including inboxes, message threading, conversation state, automation triggers, and integrations between backend services and frontend experiences. Ensure reliability of event-driven flows, collaborate with infrastructure and product engineers, and participate in on-call incident response.

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.

You will build agentic AI products across web, backend, and iOS, owning features end-to-end and mentoring junior teammates.

The role involves building and operating core services for authentication and data privacy, owning projects end-to-end, and enhancing system reliability.

As a Senior Software Engineer at Braze, you'll design and implement scalable product components using TypeScript and JavaScript, collaborating with cross-functional teams. You'll influence product strategy while ensuring customer success through robust software engineering practices.

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.

Lead design and implementation of the PSA Liquidity Platform connecting buyers and sellers. Build buyer tooling, matching/ranking engines, and seller experiences. Architect and operate microservices and Kafka-driven systems on Kubernetes/AWS, instrument observability, apply AI tooling across the SDLC, and drive cross-functional delivery from 0-to-1 while owning end-to-end outcomes.

Build end-to-end features, design intuitive interfaces, manage asynchronous backend jobs, and contribute to open-source efforts, while leading project development from concept to monitoring.

As a Full Stack Engineer at Deepnote, you'll develop and enhance features across the tech stack, support community engagement, and tackle complex engineering challenges.

Build and scale agentic payments infrastructure including agent wallets, delegated authorization, transaction orchestration, and card rails. Design secure, compliant systems bridging onchain/offchain components, ship APIs/SDKs, integrate card networks, own features end-to-end, participate in on-call rotations, and mentor teammates to raise engineering standards.

Lead the development of Coperniq's platform by designing, developing, and maintaining scalable full-stack solutions while collaborating with teams and mentoring juniors.

The Senior Lead Software Engineer will lead diverse technology projects, collaborate with product managers, and deliver cloud-based solutions while mentoring other engineers and utilizing various programming languages and technologies.

The Senior Software Engineer will design, develop, and optimize scalable PHP APIs and web applications, collaborating with product and design teams to support product development and implement best coding practices.

The Full Stack Engineer will architect and build 'The SOURCE®' platform, integrating AI and automating workflows while ensuring scalability and simplicity.

The Senior Full Stack Engineer will design and maintain features across backend and frontend systems, focusing on scalability and security while collaborating on production-grade solutions in a fast-paced environment.

As a Senior Full Stack Engineer, you'll build interactive customer experiences, manage backend architecture, write well-tested code, and ensure smooth production processes.

The Senior Full Stack Engineer will develop banking and investment systems, balancing business and technical needs while collaborating and maintaining the full lifecycle of Autopilot technology.