Top Senior Software Engineer Jobs in Denver & Boulder, CO

Design, develop, and optimize high-performance network datapath software for cloud infrastructure. Build packet-processing, forwarding, routing, filtering, tunneling, load-balancing, observability, and hardware-accelerated networking solutions. Analyze and improve throughput, latency, CPU efficiency, scalability, and reliability across Linux, kernel, user-space, and hardware systems. Lead technical designs through production, investigate complex networking issues, write architecture documentation, collaborate across engineering teams, and mentor engineers.

Develop and maintain scalable control-plane software for DigitalOcean’s Network Products team. Build APIs, optimize distributed services, troubleshoot customer-impacting issues, improve monitoring and reliability, and collaborate across networking teams on product development. Contribute to architecture, testing, CI/CD, tooling, best practices, and end-to-end ownership of cloud networking offerings such as LBaaS.

Lead the technical direction and architecture of the Foundations platform team, owning authentication, authorization, SSO, secrets management, tenancy, and core platform services. Design APIs, drive services through launch, make technical decisions, establish engineering standards, and mentor engineers without formal management authority. Partner with engineering and product leaders to align execution with priorities.

Build, test, deploy, and support production software using .NET/C#, React or Next.js, cloud platforms, databases, observability, and modern architecture patterns. Incorporate Claude Code, Gemini CLI, AI agents, MCP, and automation into structured engineering workflows while validating AI-generated output. Own delivery from planning through production, implement secure integrations and testing, document architectural decisions, troubleshoot systems, identify risks, and mentor engineers on responsible AI adoption.

Build and scale full-stack financial product experiences for OnePay’s employer benefits platform. Lead technical design, establish architectural and coding standards, optimize systems for reliability, security, performance, and scalability, and make technical decisions balancing rapid delivery with sustainable solutions. Collaborate with product, design, and operations to deliver features across web, iOS, and Android using distributed systems, APIs, and modern frontend technologies.

Develop, document, test, debug, and maintain enterprise mission applications and platform infrastructure software. Build Java microservices, deploy Docker containers, and operate applications in Kubernetes environments on AWS. Collaborate within an Agile/Scrum team, apply object-oriented design practices, use configuration-management tools, and support critical Department of Defense mission applications.

Develop and administer STIBO STEP solutions supporting enterprise master data management initiatives. Responsibilities include designing workflows, WebUI interfaces, attributes, validation rules, and integrations; ensuring data quality, governance, and platform performance; troubleshooting complex issues; supporting production operations and SaaS upgrades; and collaborating with Product, stakeholders, and engineering leadership. The role also includes mentoring engineers, estimating work, driving delivery, and implementing product, vendor, and customer data governance frameworks.

Designs, builds, scales, and operates distributed CI/CD services supporting millions of builds, tests, and releases. Develops code for Azure-based infrastructure spanning virtual machines, containers, and custom lab environments. Responsibilities include requirements analysis, architecture and design documentation, estimation, debugging, optimization, operational playbooks, on-call incident response, monitoring, reliability improvements, and mentoring engineers.

Designs and maintains enterprise software, APIs, microservices, databases, ETL pipelines, CI/CD workflows, RPA solutions, and AI/LLM applications. Leads architecture and engineering reviews while implementing secure integrations, data governance, HIPAA/PII compliance, vector search, RAG, agentic workflows, and responsible AI practices. Collaborates with technical, compliance, data, and business stakeholders to move automation and AI solutions from prototypes into production.

Lead maintenance and expansion of a flagship Windows client-server accounting product. Design, implement, test, and document features; maintain large legacy C++ codebase while developing in C#/.NET. Collaborate with cross-functional teams, gather user requirements, optimize databases, ensure code quality, and apply finance domain knowledge to deliver reliable accounting software.

Lead full-stack software development from design through delivery for Judi Health’s healthcare benefits platform. Partner with product, design, and QA teams to define requirements, build scalable features, provide technical leadership and support, and expand the platform using Python, AWS, React, TypeScript, and PostgreSQL in an Agile/Scrum environment.

Build and enhance Judi Health’s scalable healthcare platform using Python, AWS, PostgreSQL, and infrastructure-as-code technologies. Lead features from design through delivery, collaborate with product, design, QA, and engineering teams, provide technical guidance, and serve as a subject matter expert. Work in an Agile/Scrum environment while writing quality code, unit tests, and supporting cross-functional stakeholders.

Lead the technical roadmap for partner integrations across APIs, SDKs, and web experiences. Design and build scalable products, standardize external partner integrations, and deliver payment and data-sharing capabilities. Collaborate with Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success teams while remaining hands-on. Drive architecture, code quality, delivery, stakeholder alignment, and technical strategy for high-impact fintech products.

Design and implement backend services, modernize legacy systems into microservices, ensure strong testing and production observability, and collaborate with Product and Engineering teams. The role requires independent project ownership, strong system design, AI-assisted development using tools such as Claude or Cursor, effective communication with nontechnical stakeholders, and adaptability in an ambiguous, fast-changing environment.

Design, develop, test, and operate secure, scalable cloud microservices for Veeam’s FedRAMP-compliant SaaS data protection platform. Implement cryptography, authentication, auditability, observability, and reliability controls using Go and C#/.NET. Translate compliance requirements into application code and security tests, participate in technical design and code reviews, collaborate with compliance engineers, and support production services through on-call rotation.

Develop and maintain scalable backend services and RESTful APIs using .NET Core, while supporting React frontends. Build and test software components, query SQL Server and PostgreSQL databases, collaborate cross-functionally, participate in code reviews and Agile ceremonies, and use AI-assisted development tools. The role also involves continuous improvement and may include microservices, CI/CD, Docker, cloud, authentication, GraphQL, and event-driven systems.

Leads architecture, design, development, deployment, and technical direction for cloud-based SIGINT microservices. Collaborates with customers, analysts, systems engineers, and software teams using Agile methods. Develops Java/Spring back-end services and modern front-end applications, works with databases and containerized cloud systems, and manages CI/CD pipelines. The role requires active TS/SCI clearance with CI polygraph, technical roadmap ownership, and participation in quarterly customer reviews involving approximately 10% travel.

Build and maintain full-stack features for Vanta’s third-party risk management products, including vendor onboarding, lifecycle management, monitoring workflows, data models, and platform abstractions. Write tested code, participate in reviews and architecture decisions, and collaborate with product, design, and engineering teams to deliver customer-facing functionality. Experience with TypeScript, React or Node.js, web applications, databases, and REST or GraphQL APIs is expected.

Build and own the software platform connecting AI frameworks to analog hardware. Responsibilities include developing a hardware abstraction layer, experiment framework, unified simulation and physical-backend API, analysis pipelines, telemetry, diagnostics, and comprehensive testing. The role requires extensive hardware-control software experience, Python expertise, systems-language proficiency, instrumentation experience, and ownership of APIs and abstraction layers. The position offers significant technical ownership and potential to lead a platform software team.

Build and optimize pipelines migrating 8,000+ documentation pages, recreate technical documentation UI components in Angular, manage CI/CD and DevOps workflows, and work with Java backend services and proprietary enterprise infrastructure. Collaborate with design and digital teams, engage directly with clients, lead technical projects, and deliver reliable systems under aggressive timelines.

Designs and builds full-stack cloud applications with AI-powered features for supply chain and operations. Responsibilities include integrating ML models and LLM APIs, developing agentic workflows and MCP servers, modeling knowledge graphs and ontologies, establishing engineering standards, implementing CI/CD and testing, monitoring production systems, and mentoring junior engineers. The role also leads complex application projects and translates business problems into reliable, production-ready solutions.

Design, implement, and maintain scalable serverless backend services and responsive Next.js front-end components. Build data scrapers and integrations, improve CI/CD and IaC, mentor junior engineers, and collaborate with product and clients to solve complex compliance problems.

Senior Full Stack Engineer building scalable, high-performance web applications. Own feature design through delivery, write clean reusable code, optimize databases, work with CI/CD, containers, cloud, distributed systems, mentor teammates, and maintain zero customer-reported bugs.

Modernize and develop a large-scale React Native mobile application with reliable offline-first functionality, local data storage, synchronization, BLE device integrations, scalability, and strong performance. The role includes shaping architecture, improving engineering practices, collaborating cross-functionally, mentoring developers, providing technical leadership, and visiting customer farms to understand workflows. Requires extensive mobile development experience and occasional U.S. travel.

Design, implement, test, review, and maintain reliable onboard spacecraft software for monitoring, control, mission logic, fault detection, recovery, and lifecycle management. Contribute to software architecture, development standards, release coordination, and operation of Loft’s on-orbit satellite fleet. The role requires strong C/C++, Python, distributed systems, networking, multithreading, version control, CI, and build-system experience.