Top Senior Software Engineer Jobs in NYC, NY

Leads software engineering within an agile financial-services technology team. Designs, develops, tests, troubleshoots, and maintains secure, scalable production applications using Java, Spring Boot, Kafka, and cloud-native technologies. Reviews code, improves operational stability, automates recurring remediation, and promotes enterprise-approved AI-assisted development practices with validation for security, performance, and correctness. Evaluates vendor and architectural solutions while applying software development lifecycle, resiliency, security, and agile expertise.

Design and maintain backend services and APIs supporting customer and account workflows, Schwab integrations, migrations, identity, KYC, and legal-entity systems. Collaborate across Product, Engineering, Security, and Operations; build automated tests, review code, support deployments, document solutions, and maintain reliable production operations.

Build Netflix’s centralized authorization platform for its Ads organization. Responsibilities include evaluating policy engines, designing RBAC, ABAC, and ReBAC models, architecting low-latency decision services, implementing caching and policy versioning, integrating authorization across services, and developing SDKs, middleware, testing practices, and migration plans. The role requires strong backend engineering and systems design experience, authorization expertise, and familiarity with multi-tenant platforms and policy-as-code technologies.

Build Retool’s automation platform, including Workflows and Agents, orchestration engines, execution infrastructure, AI integrations, and developer tooling. Design scalable distributed systems, collaborate with product and design, own projects from architecture through launch and iteration, improve platform reliability and performance, work with customers, and mentor engineers.

Design, maintain, and optimize encoding libraries and prompt-structure abstractions used across Anthropic. The role involves supporting multimodal data, running experiments on structured inputs, performing complex refactors, improving performance, and adapting systems for emerging AI research and production needs. The engineer will collaborate closely with researchers and engineers while maintaining intuitive APIs and enabling new encoding capabilities.

Design, develop, and maintain high-performance Go- and Python-based software supporting VOD, live event, linear streaming, dynamic ad insertion, and manifest manipulation. Build resilient, observable, multi-region systems and contribute to multi-CDN strategies, routing, origin workflows, architecture, testing, and code reviews. Partner with SRE teams and distributed international engineering groups to optimize global streaming performance and reliability.

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

Design, develop, deploy, and maintain scalable customer-facing software, APIs, workflows, and data-driven services. Define technical requirements, create implementation plans, automate and test releases, review code and architecture, and drive technical decisions. The role includes mentoring engineers, identifying technical gaps, maintaining engineering excellence, and serving as a product-domain expert while collaborating with product managers, data scientists, team leads, and managers.

Build frontend, backend, and occasional mobile features for creator sponsorships. Own projects autonomously from product research and concept through implementation and deployment, collaborating with designers, writers, support staff, leadership, and sponsorship partners. Work across TypeScript, Node.js, Express, React, and PostgreSQL while contributing to product direction and delivering high-quality production experiences.

Build and maintain production-grade Golang backend services for an AI-driven investment platform. Design APIs and data pipelines supporting AI and reasoning systems, improve performance, reliability, and observability, review scalable architectures, and debug production issues. The role requires end-to-end system ownership, collaboration with AI and product teams, and mentoring as responsibilities grow.

Build safety and oversight infrastructure for AI systems, including behavioral monitoring, automated enforcement, internal dashboards, multi-cloud deployments, sandboxed agent runtimes, network and data access controls, audit logging, and observability. Manage platform capacity, costs, and service-level objectives while collaborating with researchers, engineers, security, privacy, and legal teams to deploy trusted detection and mitigation systems.

Design and develop scalable C++ software for endpoint state and control across Windows, macOS, and potentially Linux. Build reliable, multi-process systems that enforce endpoint behavior, manage local state, support IPC, and operate across millions of devices. Responsibilities include implementing features, improving platform performance, writing design documents, defining architecture and IPC contracts, and making technical decisions in an evolving, sparsely documented environment.

Build and maintain a full-stack AI-native CRM and Sales Co-Pilot: implement features, integrate ERPs, email/telephony, develop GraphQL APIs, deploy to Kubernetes, and integrate LLM-driven automation.

Build and own backend services for a private markets investing platform. Deliver end-to-end software across design, implementation, testing, deployment, and operations. Collaborate with product and engineering teams, iterate on ambiguous problems, apply distributed systems principles, and incorporate AI/LLMs for data extraction and document generation. Participate in recruiting and maintain high-quality delivery practices.

Build and own end-to-end software features for a private markets investing platform. Work across frontend (TypeScript/React/Next.js) and backend services (Python/FastAPI/AWS), contribute to design systems, testing, deployments, and product development while collaborating with product and stakeholders.

As a Senior Backend Software Engineer, you'll design, build, and operate scalable infrastructure systems, contributing to complex data processing libraries and distributed systems, while collaborating with teams to create impactful software solutions.

As a Senior Front End Software Engineer, you will develop user interfaces and APIs for data-intensive applications, ensuring usability and performance while mentoring other engineers.

As a Senior Backend Software Engineer, you'll lead the architecture and development of scalable backend services, ensuring high performance and coding standards while collaborating with cross-functional teams to enhance user workflows and build robust APIs.

Design and develop software solutions, analyze complex problems, and provide support for trading activities in a dynamic environment.

Leads full-stack software engineering projects and developer teams building scalable, cloud-based microservices and customer-facing fintech travel products. Develops solutions using Scala, React, AWS, and related technologies; collaborates with product managers, mentors engineers, drives technology transformation, and supports regulatory and business needs.

Lead diverse software engineering projects and developer teams building full-stack, distributed microservices and cloud-based solutions. Develop regulatory and customer-focused systems using multiple programming languages, databases, container orchestration, and cloud platforms. Mentor engineers, collaborate with product managers, drive technology transformation, evaluate emerging tools, and promote engineering best practices, Agile delivery, and innovation.

Build and maintain high-traffic ABC News and ABC-owned television station websites using TypeScript, JavaScript, React, and Node.js. Responsibilities include developing scalable features, creating technical designs, improving architecture and engineering practices, reviewing code, enhancing performance and accessibility, supporting observability, and mentoring engineers. The role owns features through the full software development lifecycle and serves as a senior technical resource.

Leads development and architecture of scalable Java software for NinjaOne’s endpoint management platform. Designs high-availability systems, addresses large-scale datastore performance and data-volume challenges, contributes to APIs and platform improvements, drives quality practices, owns technical initiatives, collaborates cross-functionally, and mentors junior engineers.

Build scalable, API-first platform capabilities through manifest-driven development. Develop Java and Kotlin backend services and Python workers for third-party integrations, collaborate across engineering teams, participate in architecture reviews, and troubleshoot production systems using logs, metrics, and traces. The role requires expertise in highly scalable systems, object-oriented design, REST services, relational databases, responsive messaging, caching, and software quality practices.

Design and implement scalable backup software for endpoints, servers, and cloud applications. Develop Java and Kotlin services, optimize databases and queries, debug production systems, and resolve distributed-system performance issues. Contribute code, reviews, architecture discussions, documentation, and cross-team reliability initiatives. Mentor engineers and help deliver resilient products operating at large scale.