Top Entry Level Software Engineer Jobs in Denver & Boulder, CO

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.

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.

Develops satellite ground-system software for command and control, mission planning, and data analysis. Performs full software lifecycle activities, including requirements, architecture, design, coding, testing, integration, documentation, and support. Works on a collaborative Agile team delivering reliable software in a primarily on-site environment. The role may involve office, laboratory, production floor, cleanroom, and outdoor or remote research settings.

Develops satellite ground system software for command and control, mission planning, and data analysis. Performs full software lifecycle activities, including requirements, architecture, design, coding, testing, integration, documentation, and support. Works onsite within an Agile, cross-functional team to deliver reliable software using cloud, web, frontend, backend, modeling, or embedded technologies. Clearance is not initially required, though eligibility for future submission may be necessary.

Develops satellite ground system software for command and control, mission planning, and data analysis. Performs full software lifecycle activities, including requirements, architecture, design, coding, testing, integration, documentation, and support. Works within an Agile, cross-functional team to deliver reliable capabilities for space and mission systems. The role is fully on-site five days per week and may involve travel between campuses or other locations.

Lead the design and delivery of complex distributed systems and high-impact product initiatives for Toast’s Catering & Events platform. Own critical architecture, drive technical strategy, improve scalability and reliability, mentor engineers, establish engineering best practices, and collaborate with Product and Design. The role also involves applying AI tools to improve developer productivity and enable new capabilities.

Develop, test, document, deploy, and troubleshoot software for semiconductor Atomic Layer Deposition equipment. Implement C# and .NET features, support equipment integration and laboratory testing, execute verification activities, maintain technical documentation, and collaborate with software and equipment engineers. The role also supports commissioning, system startup, software releases, and continuous improvement in office, laboratory, and manufacturing environments, with up to 15% travel for customer-site activities.

Assists with designing, developing, testing, debugging, documenting, and integrating software for aerospace applications. Collaborates with multidisciplinary teams, participates in code reviews, supports hardware-software integration, and helps maintain software quality throughout the development lifecycle. The role requires a bachelor's degree, foundational programming skills, and the ability to obtain and maintain an active Secret U.S. security clearance.

The Software Engineer - AI Systems will design and implement systems to coordinate LLMs, build testable software stacks, conduct research, and collaborate with team members to create AI-powered security solutions.

Build and operate full-stack systems for an AI-powered offensive security platform. Responsibilities include developing React frontends, TypeScript APIs, Kotlin and Go backend services, deploying on AWS, designing scalable systems, optimizing databases, supporting production, and owning features from concept through deployment. The role involves close collaboration with AI and security researchers in a fast-paced remote startup.

Own post-launch bugs, production issues, and enhancements for AI agents and related products. Investigate root causes across logs, code, conversation data, APIs, authentication, telephony, and integrations; implement and test fixes; support customers directly; guide frontline Support Engineers; and build internal tools that improve investigation and resolution speed.

Own production bugs, escalations, and enhancements for AI agent products. Investigate issues across logs, code, conversation data, telephony, integrations, authentication, APIs, and LLM prompting; implement, test, and ship fixes. Support customers directly, coordinate testing, guide frontline support engineers, build internal investigation tools, and relay feedback to Product while meeting SLAs.

Build and scale high-throughput streaming infrastructure that ingests, forwards, and computes on billions of behavioral events in real time. Own projects end to end, solve customer scaling challenges, and influence the technical roadmap. The role focuses on distributed systems capable of processing millions of messages per second with very low latency, supporting real-time personalization and AI-driven marketing products.

Develop backend systems for Hightouch’s Customer Studio product, focusing on data warehouse performance, analytics and experimentation, real-time audience syncing, and generative AI workflows. Design scalable, maintainable, and reliable distributed systems while contributing to product specifications and customer-focused solutions. The role requires strong product sense and the ability to architect data-processing features end to end.

Contribute to design, development, and implementation of client software. Write clean Java, C++, and Python code, participate in code reviews, debug and optimize applications, and collaborate with cross-functional teams.

Build and maintain core products and collaborate on larger consulting projects using TypeScript, Python, FastAPI, Next.js, GCP, and generative AI frameworks. The role involves hands-on software development within a rapidly growing, remote team serving Saudi Arabia and the GCC.

Develops and supports TMWSuite integrations for transportation and fleet systems. Responsibilities include troubleshooting enterprise applications, maintaining pre- and post-process scripts, analyzing SQL and relational databases, performing root-cause analysis, ensuring data integrity, and identifying opportunities for AI and automation. The role is fully remote with minimal travel and involves collaboration across engineering, product, and support teams.

Graduate software engineers will develop open-source and commercial software across the Linux stack, from firmware, kernels, and drivers to desktop applications, containers, clouds, and Kubernetes. Responsibilities include writing resilient, performant code, contributing to product roadmaps, engaging with users and open-source communities, addressing customer issues, and developing secure software. The role is globally remote with twice-yearly international team sprints and emphasizes mentorship, collaboration, and continuous technical growth.

Build and ship frontend features for a financial marketplace using React and Next.js. Collaborate with product, design, and backend engineers; contribute to architecture, component design, code quality, tooling, and the shared component library. Own work from design through delivery, participate in pairing and code reviews, and use AI-assisted development tools thoughtfully.

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

Develop and maintain Tailscale’s open-source client and backend networking software. Design, test, document, and optimize networking components, distributed systems, and overlay routing features. Own services through observability, incident response, and customer escalations while collaborating with product managers and designers. Apply security-first practices and improve system efficiency, scalability, and stability in a fully remote, asynchronous startup environment.

Develops real-time cloud processing solutions, signal processing and geolocation algorithms, user interfaces, and data visualization tools. Responsibilities include software design, testing with real data, integration, deployment, operations and maintenance, and delivering applications to defense and intelligence customers. The role requires independent problem-solving and collaboration across software, systems engineering, integration, and testing disciplines.

Designs and develops real-time cloud software, signal processing and geolocation algorithms, user interfaces, and data visualization tools for national security applications. Responsibilities include testing with real data, systems integration, deployment, operations and maintenance, and collaboration across engineering disciplines. The role requires independent initiative and may involve direct customer mission support.

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.

Build and maintain developer tools, SDKs, CLI, MCP interfaces, integrations, and supporting backend services. Collaborate on API contracts, compatibility, testing, releases, documentation, and shared tooling. Support developers through GitHub issues and pull requests while designing reliable systems with authentication, retries, idempotency, rate limits, monitoring, and error recovery.