Top Senior Software Engineer Jobs in NYC, NY

As a Software Engineer at Citadel, you will build systems for investments, collaborate with researchers, and tackle complex problems.

Design, build, and maintain scalable backend enterprise services for user, group, and membership management. Develop TypeScript, REST, and JSON services; implement SCIM-based identity synchronization and lifecycle management; operate high-scale systems through on-call rotations; and use Terraform, AWS CloudFormation, and Kubernetes to deliver highly available applications. Collaborate across teams on large-scale projects involving security, identity protocols, and access control models.

Lead a small engineering team while remaining hands-on in designing, building, and shipping production software. Own complex technical initiatives, set architectural direction, mentor engineers, remove technical blockers, and collaborate with Product and Design. The role focuses on distributed systems, cloud-native architecture, software quality, technical execution, and scalable AI platform features.

Build and productionize quantitative software for systematic macro research and trading. Responsibilities include prototyping research implementations, designing architectures, analyzing model impacts, evolving research systems, and partnering with quantitative researchers, product managers, engineering leaders, and business stakeholders. The role requires developing expertise across multiple research domains and delivering high-quality software products for macro instruments and markets.

Develop and productionize software for portfolio research, optimization, forecasting, and simulation. Partner with quantitative researchers to prototype architectures, accelerate research, analyze model impact, evolve core systems, and build expertise across portfolio research domains. The role requires strong software engineering and quantitative skills, including mathematical optimization, linear algebra, statistical methods, and numerical methods.

Build and operate scalable backend services powering AI agent orchestration, real-time data pipelines, scheduling, conversation history, APIs, and platform infrastructure. Collaborate with AI, product, and front-end engineers to deliver AI-powered features, improve reliability, and support consumer and enterprise customers. The role includes infrastructure as code, testing, documentation, production debugging, cross-functional prioritization, and mentoring junior engineers.

Leads the development and deployment of data solutions using Palantir Foundry and AIP. Manages engineering teams, coaches team members, oversees project planning and execution, analyzes system interactions, manages client relationships, and drives innovation. The role applies software engineering, data engineering, analytics, and AI/ML techniques to deliver scalable client solutions while maintaining technical and professional standards.

Leads the development and deployment of software and data solutions using Palantir Foundry and AI/ML technologies. Responsibilities include data engineering, analytics, system improvement, client account management, project ownership, team leadership, coaching, stakeholder engagement, and continuous improvement. The role requires building scalable applications with large datasets and delivering customer-focused solutions.

Build and evolve Notion’s Developer Platform, including APIs, MCP tools, integrations, and automation infrastructure. Develop internal and customer-facing platform capabilities, improve product reliability, performance, and scalability, and partner with product, design, data science, and research teams to define strategy and deliver features. Identify high-leverage technical investments and own software features end to end.

Build and operate high-throughput backend services for AI agents, calendar, scheduling, integrations, real-time data pipelines, and APIs. Design platform infrastructure, event-driven systems, and client-server protocols using Go, PostgreSQL, Kubernetes, and cloud platforms. Collaborate with AI, product, and frontend teams, improve reliability through testing and infrastructure as code, and mentor junior engineers.

As a Senior Software Engineer, you will lead technical design, execution, and delivery of banking features, drive architectural decisions, and collaborate across teams to enhance customer experiences.

Design, build, deploy, and operate Philo’s scalable server-side ad insertion and programmatic advertising services. Develop resilient data pipelines, ad integrations, identity and measurement solutions, monitoring tools, and highly available microservices. Collaborate with ad ecosystem partners, video delivery, ad operations, data science, and business stakeholders to optimize ad delivery, reliability, performance, security, and compliance with industry standards.

Design, implement, and optimize MongoDB database integrations, Change Data Capture and streaming capabilities, and observability systems. Develop high-performance C++ services, contribute to query engine and distributed systems architecture, lead projects from design through production support, and collaborate with product and engineering teams on technical roadmaps.

Own product features end-to-end across web app, GraphQL API, and embeddable components. Design schemas and APIs, build backend and frontend, write tests, monitor real-user behavior, and ship weekly. Establish shared component library, design system, and testing patterns. Optimize performance and leverage AI tooling to accelerate engineering and product collaboration.

Lead development of scalable Java backend applications and high-availability cloud services. Design architectures, REST APIs, databases, caching systems, and distributed session infrastructure. Mentor engineers, drive technical initiatives, address performance and scalability challenges, and uphold quality and automation practices for endpoint management products.

Design, implement, test, and deploy scalable software solutions for high-availability environments. Collaborate with technical teams, apply modern frameworks and technologies, evaluate solutions against business goals, document software and system designs, and mentor colleagues through knowledge sharing and training. The role supports virtualization, microservices, software-defined networking, network functions virtualization, and big data initiatives while resolving technical issues independently.

Design, build, and own scalable microservices and secure APIs that transfer value across blockchain and banking protocols. Extend in-house blockchain infrastructure, integrate with banks and cloud services, troubleshoot production issues, document system and testing procedures, and collaborate with product and engineering teams to deliver reliable payment experiences.

Design, develop, deploy, and maintain scalable distributed systems, microservices, APIs, data pipelines, event-driven applications, and cloud services for a marketing technology platform. Responsibilities include database optimization, observability, incident response, AI integration, production controls, technical documentation, code reviews, testing, and client implementation reviews.

Leads enterprise adoption of agentic AI-enabled engineering practices, establishing governance, security, auditability, and human oversight. Designs scalable software frameworks, writes secure production code, reviews and debugs systems, and shapes AI-enabled architecture across Consumer and Community Banking. Partners with product and engineering leaders on roadmaps, advises cross-functional teams, and drives automation across development, testing, releases, incident triage, and root-cause analysis.

Senior Software Engineer responsible for designing scalable systems serving millions of borrowers and financial partners. The role includes shaping architecture and technical roadmaps, maintaining production-grade systems, mentoring engineers, collaborating with Product, Design, and Operations, and improving organization-wide engineering practices. Teams include consumer conversion, voice AI, and compliance and money operations. The position requires in-person work at least three days per week in New York City.

The Founding Engineer will lead the development of Sailor Health's AI-powered platform, building systems for patient care and mentor the engineering team.

Lead technical architecture and large, ambiguous projects for Braze’s Messaging Experience division. Build and evolve scalable backend systems, real-time and batch processing infrastructure, orchestration frameworks, and complex web interfaces using Ruby on Rails, TypeScript, and React. Mentor engineers, improve reliability and observability, reduce technical debt, and deliver foundational platforms and code-generation tooling supporting messaging journeys across multiple teams.

Build and scale TrueMark’s education platform, focusing on real-time integrity analysis, typing behavior models, AI rubric grading, similarity search, and platform reliability. Work closely with founders and customers, influence the roadmap, and act as an IC-focused technical lead while contributing across backend and frontend systems.

Build the core AI platform for an AI-native trading experience. Develop a high-performance Rust backend supporting streaming responses, low-latency tool execution, caching, and model orchestration. Design secure, observable APIs and runtime components with authentication, authorization, rate limiting, auditing, tracing, retries, and fallbacks. Build safe trading action infrastructure with deterministic previews, confirmations, idempotency, and audit logs while partnering with product and frontend teams.

Lead the shared UI developer tooling platform used by engineering teams across the organization. Responsibilities include designing module federation architecture, Vite build tooling, CI pipelines, CLI automation, dependency management, security scanning, monorepo workflows, editor validation, preview environments, and migration strategies. The role also involves mentoring engineers, influencing technical standards, partnering with product groups, and using AI to improve engineering productivity.