Top Senior Software Engineer Jobs

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

Designs, develops, supports, and troubleshoots complex software and platform solutions using Python, Slurm, Spark, Linux, and server infrastructure. Leads technical problem-solving, documentation, SDLC practices, and architecture-related initiatives while mentoring an offshore team and guiding colleagues. The role requires strong application or platform support experience, project or team leadership, and collaboration across QA and production environments.

Design, build, scale, and operate high-volume payment APIs and distributed systems serving global traffic. Lead complex engineering projects from requirements through production, improve reliability, performance, observability, fault tolerance, and security, and participate in on-call and incident response. Collaborate across product and engineering teams, use AI-assisted development tools responsibly, and mentor engineers through technical reviews and documentation.

Leads the design, development, testing, and implementation of high-throughput Java applications, microservices, and foundational frameworks for capital markets trade processing and clearing. The role requires expertise in Core Java, distributed systems, databases, containers, event-driven architectures, and production support. Responsibilities include resolving complex technical issues, ensuring system quality and compliance, mentoring engineers, collaborating with stakeholders, and applying generative AI tools to improve software engineering productivity and modernization.

Leads the design, development, testing, and implementation of high-throughput capital markets applications for prime brokerage, trade processing, clearing, financing, and lifecycle automation. Writes performant Core Java code, architects distributed microservices, supports containerized platforms, resolves complex technical issues, and ensures quality, scalability, resiliency, risk compliance, and maintainability. Mentors engineers, collaborates with stakeholders, and applies generative AI tools to software development and modernization.

Develop and maintain software applications using Python, Java, JavaScript, and AI-enabled technologies. Translate business requirements into technical designs, build microservices and enterprise integrations, debug and test code, support CI/CD releases, troubleshoot issues, and apply quality standards. Collaborate with stakeholders, interpret data, contribute to solution design, improve user experience, manage workstreams, and mentor junior team members.

Develop and support cloud, network, and enterprise computing infrastructure for a government customer. Responsibilities include recommending and troubleshooting multi-cloud solutions, developing web applications and ServiceNow applications, building web-based UIs, automating systems, and supporting Linux environments. The role also involves cloud guidance, infrastructure services, and technical support across containerized, virtualized, and on-premises environments.

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.

Develop and support software solutions for supply chain planning and parts distribution. Translate business requirements into user stories, maintain and enhance systems, integrate Servigistics and SAP with mainframe platforms, scope accurate data feeds, configure planning parameters, and analyze scenarios. The role requires Java web development, REST APIs, databases, ETL, scripting, DevSecOps, CI/CD, AWS, and Agile experience, with collaboration across business stakeholders.

Develops secure, scalable Java software and leads engineering practices across agile teams. Responsibilities include building SDD tooling from API specifications, implementing automated unit and integration testing, troubleshooting production systems, improving resiliency, and integrating AI-assisted development practices. The role also evaluates architectural solutions, coaches teams on responsible AI use, promotes automation, and leads software engineering communities of practice.

Designs and delivers software engineering solutions focused on performance, resiliency, and production stability. Responsibilities include load and stress testing, capacity modeling, observability, incident triage, root-cause analysis, resiliency patterns, progressive delivery, container optimization, autoscaling, secure coding, and code reviews. The role also leads responsible adoption of AI-assisted engineering tools and automation across development teams.

Develop and lead full-stack software engineering for cybersecurity operations tooling. Responsibilities include architecting resilient systems, writing and reviewing code, improving automation, supporting security operations workflows, mentoring engineers, coordinating cross-team initiatives, applying cloud and modern development practices, and communicating technical updates to leadership.

Leads full-stack engineering initiatives involving distributed microservices, cloud-native systems, platform architecture, and high-reliability applications. Provides technical leadership across teams, mentors engineers, shapes technology roadmaps, and collaborates with product and architecture leaders. Builds solutions using multiple programming languages, cloud platforms, databases, containers, APIs, CI/CD, infrastructure as code, automated testing, and observability practices.

Develops real-time embedded software for the F-15 Operational Flight Program and Advanced Display Core Processor II. Responsibilities include designing architectures, requirements, algorithms, interfaces, and software; coding and integrating components; creating and executing verification plans and tests; troubleshooting issues; documenting research; and serving as a software subject matter expert. The role works within Agile teams and supports military aircraft systems.

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.

Develop and test features for a distributed, event-driven microservices platform supporting avionics application development and integration. Design, build, test, and deploy containerized services using DevOps and continuous delivery practices. Implement unit, functional, contract, and canary deployment testing; diagnose production issues and provide occasional off-shift support. Collaborate with engineering leaders, product managers, and stakeholders in an Agile environment.

The Software Engineer Sr. will design, build and maintain high-transaction APIs and Microservices, utilizing Java and collaborating in an Agile environment. Responsibilities include coding, testing, deploying solutions, and preparing technical documentation while adhering to PNC's risk management framework.

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.

Designs, develops, tests, and architects complex flight software for space systems. Responsibilities include writing maintainable code, using Git, conducting code reviews, troubleshooting, documenting software processes, and collaborating on requirements. The engineer will mentor other engineers, provide technical leadership, and apply secure coding, automated testing, CI/CD, and software development best practices.

Lead the architecture and roadmap for Android TV streaming products, solve platform scalability and security challenges, and contribute directly to critical Android applications. Drive cross-functional initiatives, engineering standards, CI/CD improvements, and technical debt reduction across teams. Mentor engineers, conduct root-cause analysis, optimize Android performance, and evaluate generative AI and other emerging technologies for product and development improvements.

Build and operate Vercel Connect, a platform for agent identity, authorization, credentials, integrations, and event forwarding. Develop third-party provider integrations, authentication flows, token infrastructure, secure credential storage, SDKs, consent flows, and webhook systems. Improve uptime, performance, developer experience, and integration scalability while collaborating with external companies and internal teams. The role requires strong TypeScript, backend and frontend development, OAuth/OIDC expertise, and security knowledge related to integration systems.

Develop and maintain full-stack data analytics applications, interactive dashboards, visualization tools, backend services, RESTful APIs, and database integrations. Integrate data sources, analytical models, and processing services into secure, scalable user-facing applications. Collaborate with data scientists, engineers, analysts, and government stakeholders while supporting testing, troubleshooting, performance optimization, CI/CD, and deployment activities.

Provides technical leadership for real-time, high-throughput trading and market data platforms supporting institutional public-markets workflows. Designs low-latency, event-driven, API-first architectures; establishes engineering standards; leads design reviews; promotes CI/CD, testing, observability, and responsible AI use; collaborates with product and architecture stakeholders; and mentors engineers. Requires strong Python and AWS experience, distributed-systems expertise, and familiarity with regulated financial services.

Develop and sustain full-stack data analytics applications for a U.S. Government platform. Build responsive user interfaces, dashboards, visualizations, RESTful APIs, microservices, database integrations, and analytical capabilities. Collaborate with data scientists, engineers, analysts, and government stakeholders to deliver secure, scalable software. Support agile development, troubleshooting, performance optimization, testing, CI/CD, deployment, and platform integration.