Top Senior Full-Stack Engineer Jobs in NYC, NY

Develop and support enterprise full-stack applications for a trust accounting and FinTech platform. Build .NET and C# backend services, SQL Server solutions, REST APIs, and modern web interfaces. Modernize legacy systems, troubleshoot production issues, and collaborate in an Agile environment. Design secure AI and LLM capabilities using prompt engineering, RAG, tool calling, and enterprise AI integrations while protecting financial data. Translate complex business requirements into scalable technical solutions and mentor less experienced developers.

Leads software engineering teams and a portfolio of technology projects within Enterprise Data Tech. Designs and implements large-scale, distributed, cloud-native systems and data platforms using full-stack technologies, microservices, databases, containers, and cloud services. Provides architectural and technical leadership, shapes platform roadmaps, establishes engineering standards, mentors developers, drives reliability and observability, and partners with product and architecture leaders to deliver secure, high-performance solutions.

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 operate full-stack features for Nebius’s agentic web infrastructure, including high-throughput API gateways, customer and identity platforms, usage and billing interfaces, self-service workflows, feature entitlements, SDKs, CLI tools, MCP servers, and developer-facing documentation.

Build and scale Statusphere’s AI-powered creator-brand matchmaking platform. Responsibilities include designing matching and recommendation pipelines, developing fullstack web services, maintaining CI/CD, conducting code reviews, investigating performance incidents, and leading features through design, deployment, and maintenance. The role also involves mentoring engineers, improving development processes, communicating technical progress, and collaborating on product and engineering strategy in a fully remote startup 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.

Build and ship full-stack AI visual creation products, including music videos, generative cover art, and animated video covers. Develop preference data pipelines, integrate and evaluate image and video generation models, and create agentic AI director workflows. Collaborate with designers and product managers to shape product scope and improve visual quality.

Lead design and build of New York Life's enterprise AI platform and agentic solutions. Work across cloud-native infrastructure, model and agent lifecycle, RAG knowledge systems, multi-agent orchestration, MLOps/LLMOps, governance, CI/CD, observability, and production operations. Partner with security, legal, and architecture to embed responsible AI and deliver production-ready, compliant AI systems.

Build and operate full-stack features for an AI-powered consulting platform. Responsibilities include frontend and backend development, data pipelines, APIs, LLM-based extraction, retrieval, chat, content generation, AI coding workflows, testing, evaluations, and quality checks. The role owns platform areas end to end, collaborates with consultants, product, and design, and translates expert judgment into reliable AI-assisted functionality.

Lead technical vision and software engineering strategy across complex domains. Design scalable, operable systems; modernize monoliths into microservices and event-driven platforms; define platform strategy and API standards; ensure implementation quality; and mentor engineers. The role requires hands-on technical contribution, cross-organizational collaboration, knowledge sharing, and leadership of modernization and best-practice initiatives.

Leads full-stack engineering teams, technology portfolios, and large-scale cloud-native initiatives. Responsibilities include setting technical strategy, mentoring engineering leaders, driving architectural decisions, managing multi-team Agile programs, defining technology roadmaps, and aligning engineering execution with business goals. The role involves designing distributed systems, supporting regulatory needs, evaluating code, developing talent and succession plans, and guiding teams using modern programming languages, cloud platforms, databases, containers, and open-source technologies.

Leads full-stack software engineering teams and a portfolio of large-scale technology initiatives. Responsibilities include setting technical strategy, mentoring engineering leaders, guiding architectural decisions, delivering distributed cloud-native systems, managing roadmaps and investment priorities, and aligning engineering execution with enterprise objectives. The role oversees multiple Agile teams, drives organizational development and succession planning, and collaborates with product, architecture, and platform leaders using modern programming languages, cloud platforms, databases, containers, and DevOps practices.

Develop and scale full-stack features for internal billing and customer-facing products using Node.js, React, and TypeScript. Own projects from conception through deployment and monitoring, solve complex technical and product problems, collaborate with product and design, maintain reliable code, and mentor teammates. The role requires strong backend and frontend expertise, experience with B2B products or enterprise workflows, independent leadership, and residence in the NYC metro area for a hybrid schedule.

Build and own full-stack, AI-native products, including multi-agent LLM orchestration, scalable FastAPI services, high-throughput pipelines, and React interfaces. Develop experimentation, evaluation, observability, safety, and rollout systems for AI agents. Optimize performance, reliability, and infrastructure while partnering with Product, Design, Customer Success, and customers. Lead incident response, on-call operations, testing, deployments, and architectural decisions in a high-ownership NYC engineering team.

Build and release full-stack web applications using TypeScript, Vue or React, and Node.js. Develop billing automation tools, enhance internal workflow portals, transform irregular data into useful workflows, and handle sensitive information with appropriate privacy and access controls. The role requires end-to-end feature ownership, independent problem solving, and experience in high-growth technology environments.

Designs, develops, tests, deploys, operates, and maintains scalable full-stack software products. Builds React-based enterprise applications, writes production-ready code, performs code reviews, improves reliability and performance, integrates APIs, and follows security, compliance, accessibility, and DevOps practices. Collaborates across teams using agile methods, analyzes failures, prioritizes work, and contributes to technology transformation and continuous improvement.

Design, build, and operate full-stack services for Unity’s global advertising platform. Own TypeScript and NestJS APIs, data models, schema migrations, event-driven integrations, and React interfaces. Operate containerized services on Kubernetes, maintain SLOs, improve observability, and ensure correctness across serving, billing, and reporting systems. Mentor engineers and establish development standards through design and code reviews.

Develop and maintain scalable full-stack web applications for an advertising measurement and reporting platform. Build responsive interfaces, APIs, backend services, microservices, database integrations, and AI agent solutions. Optimize performance, scalability, reliability, and data integrity; troubleshoot complex issues; write automated tests; conduct code reviews; mentor junior engineers; and collaborate with cross-functional teams and contractors throughout the development lifecycle.

Build and own full-stack AI applications, data APIs, dashboards, and cloud-native services. Develop Python and Node.js backends, React frontends, AI/ML integrations, RAG pipelines, authentication, API management, testing, CI/CD, and performance improvements. Collaborate with AI/ML engineers, data scientists, product, and design teams to deliver scalable, reliable, intuitive, and responsible AI experiences.

Build and operate scalable Ruby on Rails APIs and React interfaces for data activation. Responsibilities include API design, performance and reliability improvements, automated testing, production troubleshooting, documentation, architecture discussions, incident response, and cross-functional collaboration. The role requires secure, maintainable software development and responsible use of AI-assisted tools, with opportunities to establish API standards and mentor engineers.

Own end-to-end full-stack development across web applications, Chrome extensions, mobile platforms, and backend services. Build scalable React interfaces and Node.js microservices handling large datasets and concurrent requests. Translate customer needs into technical solutions, integrate APIs, create workflows and schemas, and deliver iterative, high-quality features. Collaborate autonomously with product and remote engineering teams while supporting post-launch improvements.

Develop and launch scalable full-stack web applications using PHP, Laravel, SQL, JavaScript, React, and related technologies. Responsibilities include building APIs, designing database schemas, optimizing queries and code, implementing secure and maintainable software, collaborating cross-functionally, mentoring junior developers, and owning features through production in an agile continuous-deployment environment.

Develop and maintain full-stack security infrastructure features, expand PKI, PAM, and KMS products, collaborate directly with enterprise customers, and explore AI applications for secrets management. The role requires deep JavaScript ecosystem expertise, particularly React.js, Node.js, and TypeScript, with Go and DevOps experience preferred. This is a primarily remote role for candidates in specified regions who can work U.S. hours.

Build and ship full-stack web and mobile experiences across Affirm’s consumer products. Break down projects, collaborate with product, design, and analytics teams, develop scalable APIs, write well-tested code, monitor service health, participate in on-call support, review code, and contribute to engineering growth and interviewing.

Build and lead full-stack applications using React, Node.js, and REST services. Design APIs and databases, optimize frontend performance, uphold testing and CI/CD practices, and improve observability, scalability, security, and maintainability. Collaborate with product, design, data science, medical, and security teams. Mentor engineers, document technical decisions, and advance secure AI-assisted development workflows.