Full Stack Developer (New York)

Position Title -Sr. Software Engineer / Tech LeadDuration: 6+ months(possible extension)Location: Lower Manhattan, NY 100073 days onsitePosition DescriptionClient is seeking a Senior Software Engineer / Tech Lead to join the Public Facing Systems team within the IT Enterprise Solutions Delivery team. This is a hands-on technical development role responsible for the architecture, development, and modernization of mission-critical applications that serve client residents, Section 8 landlords, and the general public.The ideal candidate is a seasoned full-stack engineer who thrives at the intersection of legacy system modernization and modern AI-assisted development. You will serve as the technical anchor for a portfolio of public-facing applications — leading design decisions, mentoring engineers, and driving the adoption of AI tooling to accelerate delivery and improve code quality across the team.Tasks/Duties:Technical Leadership• Serve as the technical lead for one or more cross-functional development teams, owning architecture decisions, code quality standards, and delivery outcomes• Translate business and program requirements from stakeholders into scalable, maintainable technical solutions• Lead system design reviews, define technical standards, and establish best practices across the team• Collaborate closely with the Senior Manager to inform roadmap prioritization, resource planning, and technical risk assessment• Act as a subject matter expert and escalation point for complex engineering challenges across the portfolioApplication Development & Modernization• Design, develop, and maintain features across .NET/C#, Java, and React-based applications in both web and mobile contexts• Drive the modernization of legacy systems — refactoring aging codebases, improving performance, and introducing contemporary patterns (REST APIs, microservices, component-based front ends) using AI-assisted development workflows• Build and maintain RESTful APIs and integrate with internal client data systems, third-party services, and city agency platforms• Ensure all applications meet security, accessibility (WCAG), and compliance standards appropriate for a public-sector environment• Contribute to mobile development efforts supporting the client iOS and Android applicationsAI Tooling & Developer Productivity• Champion the adoption of AI-assisted development tools (e.g., GitHub Copilot, Cursor, Claude Code, or similar) to increase team velocity and reduce technical debt remediation timelines• Develop and refine internal AI-augmented workflows for code generation, automated testing, documentation, and legacy code analysis• Evaluate and implement LLM-based capabilities where appropriate within applications (e.g., intelligent search, automated summarization, chatbot interfaces for resident-facing features)• Stay current on AI/ML tooling trends and serve as an internal resource for the team on responsible and effective AI usage in software developmentMentorship & Team Development• Mentor mid-level and junior engineers through code reviews, pairing sessions, design discussions, and direct feedback• Foster a collaborative team culture that values craft, continuous learning, and inclusive problem-solving