Top Software Engineer Jobs in Denver & Boulder, CO

Design, develop, test, and support Java-based software and algorithms for the C2BMC/BMDS. Produce software design artifacts, decompose system requirements, participate in Agile/Scrum, perform integration and test, and collaborate across multi-company teams.

Develop and operate backend systems supporting post-transaction processing for Affirm Card. Break down projects, write tested and extensible code, collaborate with product and engineering teams, monitor system health, troubleshoot issues, participate in on-call support, and contribute to code reviews and team development.

Paid, full-time software engineering internship supporting self-service customer applications. Responsibilities may include software development, test development, requirements gathering, and participation in agile ceremonies. Interns will collaborate with department teams, attend professional development and networking activities, receive mentorship, and contribute to projects from May 26 through August 6, 2027.

Paid, full-time software engineering internship supporting Spectrum TV Android applications. Interns will develop features across a multi-module Android codebase, instrument analytics events, resolve Jira and QA bugs, participate in code reviews, and use agentic coding tools for development, exploration, and refactoring. The program also includes mentorship, professional development, networking, community service, and cross-functional activities.

Develop production-quality Java and/or TypeScript microservices in an AWS-based distributed systems environment. Responsibilities include feature development, defect resolution, automated unit, integration, and contract testing, code reviews, performance analysis, API and architecture documentation, Datadog observability improvements, Agile participation, modernization research, and presenting results to engineering leadership.

Paid, full-time software engineering internship on the SpectrumJS team. Interns will develop features, fix bugs, write tests, and build tooling for the Spectrum TV application across connected TV and web platforms. The program includes department projects, professional development, mentorship, networking, community service, and final presentations.

Paid, full-time software engineering internship supporting private wireless and network initiatives. Responsibilities may include developing graphical user interfaces and portals, integrating customer-specific use cases, coding for Android devices, applying AI and machine learning, researching 6G and non-terrestrial networks, and automating testing for radio and core access network solutions. Interns also participate in professional development, mentoring, networking, and cross-functional activities.

Paid, full-time software engineering internship focused on backend development for scalable telecommunications services. Interns may design and develop applications alongside senior engineers while gaining experience with Java, Spring Boot, microservices, REST APIs, Kafka, AWS, and distributed systems. The program also includes professional development, mentorship, networking, community service, and final presentations.

Paid, full-time software development internship supporting the Network Tools & Automation team. Responsibilities may include creating code artifacts for audit and remediation, scripting to retrieve and process data from internal and external systems, evaluating software designs, and supporting network automation initiatives. Interns also participate in professional development, mentoring, networking, community service, cross-functional projects, and final presentations.

Paid, full-time software engineering internship supporting Spectrum’s Service Activation platform. The intern will work with SCI and Release Management teams to develop automation tools, potentially using AI, and build Jira-integrated dashboards through APIs to improve release management. The program includes department projects, professional development, mentorship, networking, community service, and presentations. Candidates must be rising seniors pursuing a bachelor’s degree, maintain at least a 3.0 GPA, and be authorized to work in the U.S. without sponsorship.

Paid, full-time software engineering internship developing tools that improve network operations and customer experience. Interns translate ideas into functional software for Access Operations and collaborate with department teams while participating in mentorship, professional development, networking, community service, and presentations. Candidates must be rising seniors pursuing a bachelor's degree, maintain at least a 3.0 GPA, and be authorized to work in the U.S. without current or future sponsorship.

Paid, full-time 11-week software engineering internship for rising seniors pursuing a bachelor's degree in Computer Science or Computer Information Systems. Interns support development teams by building features, fixing bugs, and using testing and analytics tools to diagnose issues. The program includes mentorship, professional development, networking, and cohort activities. Candidates need at least a 3.0 GPA, U.S. work authorization without sponsorship, and local travel availability for internship events.

Paid, full-time software engineering internship supporting the Data Platforms Orchestration Services team. Interns may develop backend APIs for customer-facing portals and new customer features while participating in professional development, mentorship, networking, and cohort activities. The role requires enrollment in a bachelor's degree program, a minimum 3.0 GPA, rising senior status, and authorization to work in the U.S. without current or future sponsorship.

Blissway seeks a Software Engineer to build robust systems for toll collection and highway safety. Responsibilities include coding, scaling prototypes, and integrating ML models.

Build and maintain the full-stack platform connecting Blissway hardware to drivers, partners, and agencies. Own public user surfaces, partner integrations (DMVs, mailhouses, fleet vendors, ACH), platform/deployment tooling, service infrastructure, and internal access management. Ensure secure, robust, production-ready systems and tooling that support a fast-moving, small engineering team.

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.

Design and own secure, scalable wallet infrastructure for custody, key management, transaction signing, authorization, recovery, and multichain systems. Architect support for MPC, HSMs, secure enclaves, TEEs, smart contract wallets, account abstraction, and emerging cryptographic approaches. Define security boundaries, policy engines, secrets management, authentication, and programmable authorization while making foundational build-versus-buy decisions and guiding systems from first principles through production.

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.

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 scale Go backend services for agent quoting, configuration, and application submission. Design APIs and distributed systems, write unit and integration tests, resolve partner-specific issues, contribute to architecture, support production debugging, improve CI/CD automation, and use AI coding tools in daily engineering workflows. Collaborate with adjacent teams and mentor teammates through pairing and documentation.

Build and operate a stablecoin payment rail for merchant checkout, subscriptions, refunds, reconciliation, and onchain settlement. Deliver full-stack features across Go services and React/Next.js interfaces, including APIs, protobufs, database migrations, wallet connectivity, and durable Temporal workflows. Improve accessibility, conversion, performance, and observability through logs, metrics, and traces. Participate in on-call rotations and collaborate cross-functionally to integrate Payment Acceptance into Coinbase’s developer platform.

Own the specification, design, and implementation of features for FareHarbor’s large-scale web application. Collaborate with product team members, develop scalable and performant full-stack solutions, improve automated testing, resolve technical challenges, and participate in code reviews. The role requires strong Python and JavaScript skills, experience with front-end and back-end frameworks, relational databases, performance optimization, and agile development.

Contribute to full-stack features for spacecraft mission control and distributed ground control systems. Build React/TypeScript frontends and Elixir backend services, write maintainable and testable code, collaborate with operators, designers, and engineering specialists, and participate in design and code reviews. The role involves smaller, well-defined tasks under senior guidance during a three-month temporary engagement with potential conversion.

Develop and test flight software for spacecraft computers, integrate GNC algorithms, maintain command telemetry databases, support command scripting, build subsystem simulators, and create device drivers and communications libraries. The role involves embedded RTOS development, hardware integration, mission testing, and collaboration with ground-control software teams. This is a three-month onsite temporary engagement in Denver or Long Beach, with potential conversion to regular employment.

Develop and maintain modern C++ spacecraft simulation software and multi-physics libraries. Model spacecraft dynamics, thermal systems, attitude control, propulsion, power, sensors, and actuators; implement numerical solvers and time-stepping algorithms; maintain Python and C++ APIs; and collaborate on mission planning, algorithm development, testing, code reviews, and sprint planning.