Top Senior Backend Engineer Jobs in NYC, NY

As a Backend Software Engineer, you'll design scalable features, contribute to architecture, work closely with customers, and ensure quality code.

Develop scalable backend infrastructure for AI healthcare tools, focusing on API development, data processing, and compliance. Manage integrations with healthcare systems.

Build and operate the LangSmith Deployments runtime for long-running AI agents: design distributed queue/worker systems, own state persistence and job claiming, implement resumable streaming, instrument production systems, participate in on-call and incident response, produce system documentation, and contribute to open-source LangGraph.

The Senior Software Engineer will enhance backend systems, ensure low latency in transaction processing, and maintain service availability while improving core functionalities.

As a Senior Backend Engineer, you will architect solutions, develop RESTful APIs, design service communication systems, and ensure high product quality within a scalable team environment.

Own and evolve backend systems and cloud infrastructure for an AI discovery platform. Build scalable services in Python and Go, manage IaC (Terraform), containerized deployments (Docker/CI/CD), integrate LLM providers, optimize performance/cost/observability, mentor engineers, and influence long-term backend architecture to support growth.

Build, operate, and extend data platform and application-layer services enabling secure, self-service data applications at scale. Implement provisioning, CI/CD, access control, integrations, observability, automation, and incident response while contributing to semantic layer and AI-ready tooling roadmaps.

As a Senior Backend Engineer, you will enhance Polymarket's CLOB engine by optimizing performance, handling transaction states, and debugging production issues, focusing on concurrency and observability.

The Senior Software Engineer will lead and support a team in developing reliable and scalable backend systems, collaborating on product development, and improving infrastructure for secure communication between services.

Design and build tooling, workflows, and guidance to make GitLab easier to deploy, validate, and operate across cloud-native, self-managed, and ephemeral environments. Shape deployment architecture, topology, scaling principles, and platform contracts while collaborating with application, infrastructure, and delivery teams.

Build and scale Spotify’s backend infrastructure and Distribution API for millions of podcast shows and creator content. Design systems supporting emerging content formats, lead cross-functional technical initiatives, improve platform architecture, and maintain reliable critical services through on-call rotations. The role requires strong Java backend experience, cloud and relational database expertise, distributed systems knowledge, API development at scale, adaptability, clear communication, and regular use of AI-powered developer tools.

Build and scale Polymarket's low-latency exchange backend: design high-performance services, optimize for latency/throughput, architect distributed/event-driven systems, operate and debug production on Linux, ensure reliability and security, and collaborate across product, infra, and data teams.

Senior Full Stack Engineer (backend-focused) to design, build, and operate scalable backend systems and APIs, deliver full-stack features, improve reliability and observability, and contribute to architecture and technical strategy in a fast-paced startup environment.

Lead the backend development for Artian's AI automation platform, focusing on scalable services, API design, and architectural decisions. Mentor engineers and enhance engineering practices in a collaborative environment.

The Senior Backend Engineer will enhance the security and scalability of the LangChain platform, working on enterprise readiness features such as authentication and billing systems while collaborating with various teams and enterprise clients.

As a Backend Engineer, you will design and build backend systems and APIs for LangChain's observability and evals platform, optimizing performance and reliability while collaborating with cross-functional teams.

Design, build, and operate identity and access systems, financial operations (transfers, ledgering, reconciliation), and blockchain infrastructure. Define reliability/observability standards, lead cross-functional projects, mentor engineers, and uphold security and transactional correctness.

Lead design and implementation of production integrations (CRMs, CDPs, measurement vendors), own projects end-to-end, drive public API and developer platform architecture, improve pipeline reliability and scale, mentor engineers, set engineering quality standards, and collaborate with external partners. Use TypeScript/Python and cloud infrastructure to build scalable, production-grade systems.

As a Senior Back-End Software Engineer, you will design and implement robust software infrastructure for a telehealth platform, collaborating closely with key stakeholders and contributing to the engineering culture.

As a Senior Product Engineer, you will develop reliable backend systems, manage complex databases, and contribute to building revenue-critical infrastructure. You'll work closely with a lean team, guiding projects from ideation to implementation.

Design and implement complex financial systems for payment processing and compliance, lead technical decisions, mentor engineers, and optimize system performance.

Lead backend development for the Reporting & Measurement platform: architect and ship features, design relational and non-relational data models, scale distributed systems, collaborate with Data Science and Product, drive technical architecture decisions, mentor junior engineers, and conduct peer reviews.

As a Senior Backend Engineer at Socure, you'll develop scalable backend services for identity verification, optimize system performance, and collaborate with cross-functional teams on document processing integrations.

Build and own backend services that analyze patient medical charts, identify diagnoses, and surface supporting clinical evidence. Lead projects through the full lifecycle, make architectural decisions, design clinical data models and service contracts, improve system reliability and performance, mentor engineers, collaborate with clinicians and product teams, and participate in on-call, monitoring, and production support.

Build and maintain efficient backend web services and APIs, participate in daily deployments and code reviews, translate business ideas into product components, and collaborate on team projects to deliver high-quality code.