Top Senior Software Engineer Jobs in NYC, NY

Build and ship end-to-end full-stack features across frontend, backend, APIs, databases, and cloud infrastructure. Develop AI-powered capabilities, integrate external services, optimize performance, write unit and integration tests, conduct code reviews, mentor junior engineers, and participate in production support. Collaborate with product, design, and engineering partners to define requirements, make architectural decisions, and deliver reliable, accessible user experiences.

Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.

Design, build, deploy, and support scalable Java microservices on AWS. Provide technical leadership, architectural direction, code reviews, troubleshooting, proof-of-concept development, and cross-functional collaboration. Work with high-throughput data, messaging systems, distributed architectures, observability, and AI-assisted development tools. Participate in on-call support, mentor engineers, lead architectural initiatives, and deliver reliable SaaS platform features.

Own the development and maintenance of large-scale React Native applications for iOS and Android. Lead architecture improvements, React Native upgrades, native module development, performance optimization, automated testing, CI/CD reliability, and production debugging. Collaborate with cross-functional product pods, contribute to technical discovery and architecture, mentor engineers, and raise engineering standards while delivering scalable, maintainable mobile experiences.

Design, build, and operate foundational developer infrastructure across CI, build systems, deployment orchestration, and test platforms. Improve build speed, deployment safety, and test reliability while owning services end to end, including SLOs, observability, and on-call responsibilities. Partner with engineering teams to address platform pain points and lead cross-cutting technical projects through production.

Design, build, test, and scale Gusto’s payments infrastructure and platform. Make architectural decisions focused on fault tolerance, scalability, and modularity; modernize Ruby/Rails and TypeScript/React systems; collaborate across engineering, product, design, data science, and operations; deliver software supporting millions of businesses; and mentor fellow engineers.

Lead development of scalable platform software supporting BlackRock’s Aladdin investment operating system. Responsibilities include building Java systems, CI/CD pipelines, container platforms, distributed services, data and messaging capabilities, and highly available applications. The role provides technical leadership, manages project priorities, applies test-driven and Agile practices, supports production operations, collaborates on roadmaps, and contributes to recruiting and team culture.

Develop and maintain FreeWheel AdManager SDKs across Web, iOS/tvOS, Android, and Connected TV platforms. Design APIs, improve performance and reliability, support video-player integrations, troubleshoot production issues, participate in testing and releases, collaborate cross-functionally, and mentor engineers. The role requires strong software engineering fundamentals, client-platform development experience, SDK or reusable-component development, debugging, automated testing, CI/CD, and effective communication.

Develop and scale NinjaOne’s ticketing and billing products using Java and Kotlin. Design reliable enterprise software, REST services, relational data systems, caching solutions, and client-server applications. Address scalability, asynchronous design, API development, testing, and integrations with accounting platforms such as QuickBooks and Xero. Contribute hands-on code, apply object-oriented design principles, and help ship software serving millions of endpoints.

Build and operate backend-focused production software, APIs, integrations, databases, distributed systems, and asynchronous workflows. Develop AI-enabled and agentic systems with retrieval, tool use, evaluation, permissions, observability, and reliability controls. Own products from definition through iteration, collaborate with data engineering, data science, and SRE, make pragmatic technical tradeoffs, and mentor engineers.

The role involves designing and developing core features for the Linux sensor in CrowdStrike's security platform, collaborating with teams across the company, and maintaining software quality for cross-platform delivery.

Architect and develop scalable full-stack benefits platforms, including customer-facing web applications, shared services, benefits workflows, and AI-driven interfaces. The role involves frontend and backend development, system scalability, observability, CI/CD, personalization, and recommendation capabilities. The engineer will mentor colleagues, establish AI-native development practices, influence technical roadmaps, and partner with Marketing, Sales, Operations, and leadership to deliver reliable benefits shopping experiences.

Own full-stack HR Experience features from technical design through implementation, testing, deployment, monitoring, and incident response. Write maintainable code, collaborate with product and design, participate in engineering ceremonies, improve system reliability and performance, and mentor less-tenured engineers. The role requires strong backend and frontend development, relational database expertise, software engineering fundamentals, end-to-end project ownership, and clear technical communication.

Build foundational frontend systems, reusable components, developer tooling, and customer-facing experiences for a large TypeScript and React platform. Lead projects from technical design through rollout, improve developer experience, ensure accessibility and performance, collaborate across engineering and design teams, and mentor engineers through reviews, pairing, and technical guidance.

Develop and support SAP ABAP and HANA solutions for Finance, Procurement, Subledger, and BRIM systems. Design CDS views, OData services, SQL objects, AMDPs, and RAP-based Clean Core extensions. Participate in SAP implementations, integrations, migrations, debugging, testing, production support, and ongoing enhancements across S/4HANA and ECC environments. Collaborate with business stakeholders, product teams, and distributed engineering resources while following development standards, controls, and project methodologies.

Architect and develop production-grade business systems across Salesforce, NetSuite, and integrated enterprise platforms. Build quoting, subscription, and entitlement engines; create automation pipelines and API integrations; establish architecture, security, documentation, and code-review standards; and translate commercial policies into scalable technical solutions. The role partners with Finance, Sales Operations, Customer Success, and product stakeholders while maintaining system reliability, auditability, observability, and production readiness.

Build and evolve Notion’s Developer Platform, including APIs, MCP tools, integration infrastructure, and internal platform capabilities. Partner with product, design, data science, and research teams to define strategy and deliver reliable, scalable features. Own production software end to end, improve platform performance and robustness, and drive high-leverage technical investments. Help developers and customers create integrations, automations, and connected workflows.

The Senior Software Engineer will design and build scalable AI/ML backend systems, develop data pipelines, and collaborate with cross-functional teams to implement ML-driven features while ensuring system performance and documentation.

Lead technical strategy and execution across multi-quarter initiatives, build and optimize AI-enabled software systems, mentor engineers, collaborate across disciplines, and protect user privacy and security. The role works with large-scale healthcare data in an AWS and Kubernetes environment, using technologies including Python, TypeScript, React, Go, Airflow, DBT, and Claude Code.

Build and scale full-stack applications for Braze’s Cloud Data Ingestion and Data Transformation platforms. Own features end-to-end, with emphasis on backend development, scalable web applications, architecture, technical strategy, and high-volume data processing. Collaborate in an agile environment and deliver front-end experiences as needed. The role may involve automated data pipelines, asynchronous processing, ETL, microservices, distributed systems, and technologies such as Python, Django, React, Ruby on Rails, Snowflake, Kafka, Airflow, Sidekiq, SQS, and RabbitMQ.

Build and enhance Ramp’s marketing website, brand design system, and reusable component library. Partner with designers, engineers, paid advertising, and growth teams to create interactive experiences, conduct landing-page A/B tests, and drive lead generation. The role requires strong frontend and design engineering skills, responsive design expertise, and close attention to implementation details.

Build and operate scalable backend infrastructure for financial data, including ingestion, transformation, integration, and serving systems. Design high-performance distributed pipelines handling millions of documents and datapoints, support AI and retrieval systems, and integrate heterogeneous financial sources. Ensure secure, compliant, reliable handling of customer data while collaborating with globally distributed engineering teams and influencing technical direction.

Own major full-stack product features from design through launch for an AI platform serving financial institutions. Build scalable, reliable software using React, TypeScript, Python, and cloud technologies; collaborate with engineers, domain experts, users, and Customer Success; and develop AI-powered user experiences using modern framework capabilities.

Designs and develops large-scale, distributed, multithreaded software applications and services for trading and post-trading workflows across equity and options asset classes. Builds order state management components for trading platforms, conducts scrums, and manages deliverables. The role requires extensive Java and distributed-systems experience, along with messaging, database, testing, integration, and server-side development expertise.

Leads development of scalable Disney media product applications across web and mobile platforms. Translates product requirements into technical solutions, writes and reviews robust tested code, supports application lifecycles, improves engineering standards, collaborates with service teams, and mentors developers. The role emphasizes React, Node.js, mobile applications, APIs, cloud deployment, accessibility, and high availability.