Top Software Engineer Jobs in Denver & Boulder, CO

Develop and maintain physics-based space and missile defense models, engagement and mission simulations, and analysis tools using Python and C++. Integrate simulations into SIL, HIL, and distributed environments; perform verification, validation, Monte Carlo studies, and data correlation. Collaborate with engineering and government stakeholders on requirements, testing, and technical recommendations. The role requires aerospace or related experience, knowledge of orbital mechanics or missile trajectories, and eligibility for Secret or TS/SCI clearance.

Build and operate full-stack software for the company’s digital thread, including services, APIs, data models, user interfaces, integrations, data migrations, and workflow automation. Write tests, participate in code reviews, monitor production systems, resolve data and user issues, and document technical work. Engineers will progressively own larger features while learning product-data systems and supporting aerospace engineering operations.

Design and implement backend APIs, microservices, and checkout platform components for Affirm’s financial products. Own system health, improve performance and reliability, collaborate across engineering teams, and contribute to technical standards, tooling, and processes. The role requires developing, testing, and shipping high-quality software at scale while making customer-centric technical decisions.

Assists with designing, developing, maintaining, testing, and debugging software applications. Participates in code reviews and Agile ceremonies, writes technical documentation, researches relevant technologies, and collaborates with Quality Assurance to validate application reliability and user requirements. The role requires onsite work four days per week, a variable schedule including potential nights and weekends, and independent judgment in significant matters.

Design, develop, integrate, and maintain ERP financial applications using Oracle and PL/SQL. Optimize performance, resolve defects and integration issues, apply security and compliance standards, participate in Agile/Scrum, lead code reviews, estimate work, and mentor junior developers to support finance operations and revenue objectives.

Develop and maintain backend services for OppFi’s financial technology platform. Responsibilities include building Java applications and services, collaborating in an Agile environment, conducting code reviews and testing, documenting best practices, and refining technical requirements into production-ready solutions. The role uses AWS, Docker, PostgreSQL, APIs, and related cloud-native technologies.

Designs, develops, tests, and debugs systems software, storage firmware, operating-system components, and platform interfaces. Leads software engineering projects, creates test plans and documentation, resolves integration issues, collaborates with internal and outsourced teams, and mentors less-experienced engineers. The role requires expertise in Python and shell scripting, firmware validation, PCIe, NTB, NVMe, networking, Linux, Windows, and VMware environments.

Develop and scale backend streaming and data infrastructure using Kafka, Flink, AWS, Kubernetes, and related technologies. Break down projects, deliver tested software, collaborate with product and engineering teams, monitor system availability, participate in on-call support, debug code, conduct code reviews, and contribute to team development.

Develop high-fidelity spacecraft simulation software in modern C++ and Python. Build multi-physics models covering spacecraft dynamics, thermal systems, attitude control, propulsion, power, sensors, and actuators. Implement solver architectures and time-stepping algorithms for real-time and faster-than-real-time simulation, maintain multi-language APIs, collaborate with engineering teams, and participate in code reviews and planning.

Develop and test Java-based C2BMC missile defense applications across the full software development lifecycle. Responsibilities include architecture and requirements development, design artifacts, coding, reviews, integration and testing, agile execution, issue resolution, and performance optimization. The role also involves collaborating with industry partners, documenting test activities, deploying integration processes, and mentoring junior engineers. Work is fully onsite in Colorado Springs or Huntsville and requires an active U.S. Secret clearance.

Build, optimize, and maintain software systems using AI while collaborating across disciplines on healthcare technology. Develop distributed, event-driven systems, learn new languages and frameworks, and protect user privacy through data security and HIPAA-compliant practices. The role works with AWS, Kubernetes, and large-scale medical datasets in a fast-paced, mission-driven environment.

Design, deploy, and optimize Philo’s distributed video streaming infrastructure, including ingest, transcoding, packaging, delivery, RESTful services, analytics pipelines, DRM, and ad insertion. Improve platform reliability, performance, latency, security, video quality, and cost efficiency. Collaborate with content partners and internal video, advertising, client, and data teams while supporting streaming quality across new platforms. The role also involves architectural ownership, cloud operations, and mentoring.

Architect and build a high-performance trading platform for active traders. Develop responsive web interfaces integrating real-time market data, low-latency execution workflows, and advanced trading tools. Collaborate with cross-functional engineering teams on large-scale initiatives, emphasizing scalability, performance, API quality, maintainability, developer experience, and end-user usability.

Develops and supports Windows-based applications, implementing features, fixing bugs, and maintaining platform functionality. Responsibilities include unit and integration testing, documentation, full-stack debugging across operating systems, databases, applications, and networks, and applying secure, high-performance, highly available design practices. The role independently solves technical problems, collaborates on pragmatic solutions, mentors teammates, and contributes to ongoing technical and product knowledge growth.

Develop and maintain native iOS applications using Swift and SwiftUI for DraftKings’ financial platform. Responsibilities include building user-facing features, integrating APIs, managing data and state, optimizing performance, monitoring crash analytics, participating in code reviews and testing, and troubleshooting reliability issues. The role collaborates with product, design, analytics, and engineering teams to deliver scalable, compliant mobile experiences.

Develops, integrates, tests, maintains, and supports Java-based software systems and mathematical algorithms for Boeing’s C2BMC missile defense applications. Responsibilities include software architecture, requirements decomposition, interface development, design documentation, coding, debugging, performance optimization, agile execution, integration and testing, operational support, and technical issue resolution. The role collaborates with systems engineering, integration and test teams, and industry partners while supporting full software lifecycle activities for ballistic missile defense systems.

Build and launch backend identity decisioning systems that validate consumer identity and satisfy KYC regulations. Collaborate with Product, Compliance, Auth, Fraud, Analytics, and engineering teams; decompose projects, write tested and extensible code, monitor system metrics, support availability and on-call operations, debug code, participate in reviews, and contribute to technical decisions and team development.

Develops and maintains software requirements, architectures, algorithms, APIs, backend services, and user interfaces for SATCOM mission-planning systems. Supports Agile and DevSecOps development across design, integration, testing, and deployment, including CI/CD automation, vulnerability scanning, code reviews, and performance optimization. The role works with space and ground systems, geospatial visualization, databases, Kubernetes, and modern front-end technologies. It requires active Secret clearance, U.S. citizenship, full-time onsite work in Colorado Springs, and up to 10% travel.

Build and deploy full-stack healthcare financial products used by millions of patients. Develop AI- and ML-powered features, integrate LLMs, enhance an AI billing assistant, and create patient payment solutions. Collaborate with product, design, and partner engineering teams to deliver production-ready software. Contribute to technical planning, coordinate complex development efforts, mentor peers, and maintain high standards for testing, code quality, efficiency, and technical debt management.

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.

Develop and support software for satellite radiometric calibration, imaging sensor commissioning, and space operations. Responsibilities include service architecture, reliability monitoring, CI/CD integration, automated testing, operational troubleshooting, cloud-based distributed systems design, and collaboration with scientists and software teams. The role supports production and test environments, investigates data anomalies, and advances calibration operations for satellite imagery and geospatial data products.

Develop and operate Java and Kotlin services for a large-scale cloud platform. Responsibilities include designing, testing, deploying, and improving software; diagnosing production reliability and performance issues; addressing scalability bottlenecks; enhancing observability; participating in incident response; and contributing to architecture, code reviews, and operational improvements.

Build and operate an agentic SOC investigation platform using LLMs, including telemetry tools, investigation workflows, evidence-backed outputs, evaluation systems, and analyst productivity features. Develop secure, reliable, observable backend services that handle attacker-influenced data across customer environments. Collaborate with SOC analysts, researchers, technical leads, and product managers to translate investigative expertise into production agent behavior.

Build and maintain real-time, event-based systems for the Offers team. Lead the design and development of scalable services, create maintainable technical solutions, enforce code quality and governance, and own systems from development through production. The role involves mentoring developers, estimating work, documenting solutions, supporting business needs, and working across Go, TypeScript, React, SQL, Kafka, and GCP.

Design, implement, and operate scalable managed database platform systems across distributed control planes and infrastructure. Lead architecture and cross-team technical projects, improve performance, resiliency, failover, backups, and recovery, and support multi-region workloads. Mentor engineers, conduct design and code reviews, establish observability practices, participate in on-call rotations, and turn production incidents into lasting improvements.