Top Senior Level Software Engineer Jobs in CO

Design, build, and own backend services, APIs, and integrations supporting customer care workflows. The role connects Salesforce, billing, identity verification, document management, and iPaaS platforms; requires automated testing, code reviews, incident response, performance monitoring, and cross-functional collaboration. The engineer will also apply AI tools and may build production LLM solutions.

Designs, builds, and ships scalable full-stack features for Toast’s restaurant and retail technology platform. Responsibilities include developing resilient backend services and APIs, responsive web interfaces, distributed systems, and high-throughput enterprise solutions using Java, Kotlin, React, and TypeScript. The role requires solving ambiguous technical problems, ensuring system reliability and observability, applying engineering best practices, collaborating cross-functionally, and mentoring engineers.

Leads enterprise-wide software architecture and engineering initiatives for highly distributed, large-scale systems. Designs and delivers new services, evaluates technologies and frameworks, drives engineering standards, prototypes solutions, and resolves architectural challenges. Provides technical leadership through mentoring, architecture reviews, cross-team consultation, public speaking, technical writing, hiring interviews, and engagement with external engineering communities. Remains hands-on in software architecture, design, implementation, performance analysis, and reliability.

Build and architect scalable React Native mobile applications from scratch. Lead technical decisions involving app structure, patterns, libraries, coding standards, and architecture. Collaborate with cross-disciplinary teams, mentor engineers, conduct code reviews, plan major projects, and promote high-performance software engineering practices using Agile methodologies.

Build scalable backend services and infrastructure for mobile and web products. Design secure RESTful APIs, architect high-performance systems, apply engineering best practices, estimate and track Agile tasks, mentor teammates, collaborate with clients and engineers, and take ownership of technical solutions.

Lead development of custom Shopify themes and apps, optimize storefront performance and SEO, integrate APIs and third-party services, and collaborate with design, strategy, and engineering teams. The role requires maintaining scalable Shopify solutions, applying responsive design and modern development practices, and staying current with Shopify platform updates. This is a fully remote position with flexible work location and professional development support.

Design, build, test, deploy, monitor, and support scalable enterprise software across the full lifecycle. Evaluate requirements, estimate effort, identify risks, collaborate with Product Management, conduct code and design reviews, and improve architecture and development practices. The role requires full-stack Java and modern front-end experience, API and event-driven integration expertise, database design, incident response, and CI/CD experience with Docker and Kubernetes.

Leads and develops a software engineering team responsible for real-time, event-based bonus systems. Oversees people, delivery, governance, quality, architecture, risk mitigation, and process improvement. Drives SDLC transformation through AI and agentic workflows, removes delivery blockers, mentors developers, and remains hands-on with technical solutions. The role requires expertise in scalable, highly available, low-latency systems, server-side and frontend development, databases, messaging, and middleware.

Lead a small team developing and supporting a business-critical verification platform. Design and deliver scalable, maintainable, performant systems during a ground-up re-architecture using Golang, React, cloud platforms, Kafka, SQL, .NET, and TypeScript. Provide technical leadership, solution governance, estimation, hands-on development, escalation support, code-quality oversight, and coaching while collaborating with UK teams and ensuring reliable delivery.

Build and maintain production frontend applications for mission-critical communications software. Develop reusable UI components, integrate frontend systems with APIs and backend services, implement testing and CI/CD pipelines, resolve defects and performance issues, and support technical documentation. Translate requirements into development tasks, contribute to agile planning, provide technical leadership and mentorship, and collaborate with engineering, UI/UX, and customer stakeholders.

Leads software systems engineering for SATCOM mission planning supporting military NC3 networks. Responsibilities include requirements, architecture, API and backend development, user interface implementation, integration, testing, deployment, code reviews, security, performance improvements, mentoring, and Agile DevSecOps delivery. The role requires onsite work in Colorado Springs, active U.S. Secret clearance, U.S. Person status, and up to 10% travel.

Develop and maintain high-performance networking platform software for switch and NIC Linux systems. Responsibilities include custom ASIC driver development, API creation, scalable and resilient systems programming, testing, debugging, documentation, and integration. The role leads software engineering projects, collaborates with internal and external development teams, contributes to architecture decisions, and mentors less-experienced engineers.

Design, build, and improve scalable backend systems that collect hard-to-access OSINT; build pipelines and ETL for messy data; collaborate with product and mission teams; mentor engineers and ensure reliable data delivery for DoD workflows.

Develops embedded satellite command and control, mission planning, and data analysis software. Performs full software lifecycle activities including requirements, architecture, design, coding, testing, integration, documentation, and support. The role requires on-site work five days per week and may involve travel between campuses or other locations. Work spans cloud, web, backend, modeling, simulation, test infrastructure, and formal software development practices.