Top Senior Software Engineer Jobs in NYC, NY

Leads software engineering efforts within commercial banking, providing technical guidance, developing and reviewing secure production code, and solving complex design and functionality challenges. Drives adoption and governance of AI-assisted engineering practices, automation, responsible AI controls, and SDLC frameworks. Serves as a subject matter expert, influences product and technical decisions, promotes engineering standards, and partners with technical and business stakeholders to deliver stable, scalable cloud-native systems.

Leads development of secure, scalable Java and cloud applications; designs, codes, tests, debugs, and reviews production software. Drives AI-assisted engineering practices, automation, monitoring, operational stability, secure SDLC adoption, and application resiliency. Evaluates vendor and internal architectural solutions while coaching teams on responsible AI use, secure coding, testing, and agile delivery.

Build and ship backend features end-to-end using Ruby on Rails and SQL. Lead complex technical projects, solve architecture challenges, establish standards, conduct meaningful code reviews, resolve high-risk bugs, document systems, collaborate across engineering teams, and mentor junior engineers.

Build and operate production identity-platform features end to end, including data models, APIs, user interfaces, architecture, and deployment. Engineers independently make technical tradeoffs, collaborate with customers, design, and product, and maintain high standards for code quality, reliability, and system design. The role favors adaptable generalists, with opportunities for specialists in identity, security, distributed systems, connectors, performance, or large-scale data systems.

Develop and support scalable, secure applications and infrastructure across cloud and on-premises environments. Responsibilities include software development, testing, debugging, incident investigation, monitoring, deployment automation, server and network support, cloud migration, infrastructure scripting, and security alignment. The role also contributes to data-intensive analytics initiatives and continuous improvement while collaborating with technical and business stakeholders.

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.

Lead the technical design and delivery of electronic prescribing modernization for OncoEMR. Build and review full-stack software using C#, VB.NET, React, and .NET services; modernize legacy WebForms workflows; develop safety-critical prescribing features; partner with product, QA, design, clinical, and vendor teams; manage complex projects from planning through rollout; and mentor engineers through code reviews, pairing, and design guidance.

Own and operate Justworks’ shared Temporal platform, hardening its self-hosted cluster for multi-tenant reliability, scalability, security, and regional resilience. Define SLOs, observability, alerting, and safe workflow conventions; guide tenant teams on retries and idempotency; lead migrations and infrastructure consolidation; manage capacity and costs; and participate in on-call incident response, troubleshooting, and postmortems.

Build and maintain scalable Java backend services and APIs for internal platforms. Integrate services with Salesforce and other systems, contribute to internal web applications, troubleshoot distributed systems, and ensure strong testing, observability, resilience, and CI/CD practices. Collaborate with product, technical program management, and business teams to deliver reliable tools supporting operations, marketing, support, risk, and data functions.

Own backend engineering from problem definition through production for a platform handling sensitive financial data. Design backend architecture, build transaction, billing, and reimbursement automation, collaborate with product and operations teams, and improve engineering tooling and processes. The role requires shipping scalable, privacy-critical server-side systems with minimal oversight in a small, fast-moving team.

Build performant, beautiful, and usable frontend interfaces using JavaScript, React, TypeScript, Vite, and Ryu. Lead complex projects, influence technical vision, improve engineering processes, uphold high UX standards, and collaborate across teams. The role includes recruiting, interviewing, mentoring engineers and interns, and translating business and product ideas into scalable engineering solutions.

Develop platform software using container runtimes and Kubernetes to enable GPU-accelerated applications. Design systems software for container orchestration, cloud-native environments, and distributed systems. Integrate software across NVIDIA engineering teams while addressing performance, security, reliability, and evolving priorities. The role involves Rust and Go development, Linux system internals, container sandboxing, confidential computing, virtualization, and GPU resource management.

Build backend-leaning product features for Hex’s AI analytics platform, including APIs, CLI workflows, MCP integrations, access-control systems, enterprise administration, and full-stack product changes. Design scalable systems, implement complex business logic, collaborate through RFCs and code reviews, and contribute across the application stack. The role uses TypeScript, GraphQL, Postgres, Redis, Kubernetes, AWS, and related infrastructure technologies.

Design and evolve shared backend infrastructure, including APIs, realtime transport, storage frameworks, background job systems, workflow orchestration, and internal tooling. Improve reliability, performance, observability, and security while partnering with product teams on reusable abstractions. Lead technical design discussions, drive migrations and refactors, mentor engineers, and help establish backend architecture and engineering standards.

Build secure, scalable AI integration platforms connecting enterprise systems, external tools, and data sources. Design backend APIs, distributed services, authentication boundaries, and agent orchestration workflows. Drive reliability through observability, SLOs, incident readiness, and performance optimization. Partner cross-functionally on technical strategy, lead architecture reviews, mentor engineers, and own delivery from design through production.

Designs and delivers scalable Java and Python applications for mortgage trading, analytics, workflows, and reporting. Partners with business, risk, product, and technology teams to integrate platforms and develop products. Applies AI and GenAI to automate workflows and analysis, manages the software development lifecycle, supports production applications, resolves complex initiatives, and mentors junior team members.

Staff backend infrastructure engineer responsible for platform reliability, performance, regional resilience, failover, migrations, data pipelines, observability, incident response, and shared engineering tooling. The role leads cross-team technical direction, mentors engineers, and partners with security and compliance in a regulated financial services environment. Key technologies include Java, MongoDB, Kubernetes/GKE, Terraform, Datadog, and cloud infrastructure.

Develop and maintain CrowdStrike’s macOS endpoint security sensor using C/C++ and Swift. Design high-performance, reliable software across operating-system subsystems including filesystems, memory, processes, and networking. Own features from design through delivery, collaborate with distributed teams, troubleshoot customer-reported issues, and contribute to major product releases. The role requires strong concurrency, performance, and low-level systems expertise, plus effective use of AI technologies to improve workflows and decision-making.

Build and lead development of the core computation platform powering payroll, money movement, and tax products. Own large-scale projects from discovery through launch, improve system performance, reliability, and scalability, and expand fault-tolerant processing infrastructure. Mentor engineers, strengthen testing and deployment practices, secure sensitive data, and collaborate with product managers, designers, and cross-functional teams to deliver accurate, compliant financial solutions.

Own large-scale software projects from discovery through launch, improve system performance, reliability, and scalability, and expand fault-tolerant infrastructure. Provide technical leadership, mentorship, and knowledge-sharing while collaborating with product managers and designers. Enhance testing, monitoring, and continuous deployment systems, and ensure sensitive data remains secure.

Lead technical strategy and execution for Affirm’s account management team, building secure, scalable fullstack systems and customer account security experiences. Collaborate with product, design, analytics, and engineering teams; establish quality, monitoring, testing, and operational standards; support availability and on-call practices; communicate technical decisions; and mentor engineers.

Design, implement, maintain, test, monitor, and debug Cloudflare’s distributed Load Balancing systems. Collaborate with security, network engineering, SRE, and product teams to build scalable, fault-tolerant solutions. Participate throughout the software development lifecycle, review code, mentor teammates, support production operations, and improve system reliability using Go, Rust, TypeScript, databases, containers, and orchestration technologies.

Build and scale mission-critical tips, earnings, and payroll platforms for restaurant employees. Own systems end to end, lead complex projects from design through deployment, improve reliability and correctness, collaborate with product and design, review code, mentor engineers, and deliver scalable backend services that affect employee pay and product revenue.

Build and maintain backend platform systems that connect digital banking software with core banking systems. Develop reliable, performant APIs and support account and transaction data integrity, real-time transaction alerts, transfers, and payment settlement workflows. The role requires collaboration on complex financial integrations and may involve Python, Django, infrastructure automation, and Linux administration.

Develop and maintain a fraud-analysis web application and platform. Build APIs and user interfaces, write automated tests, troubleshoot production issues, collaborate with product and cross-functional teams, analyze product metrics, and support SLA compliance through production on-call rotation.