Backend Developer Jobs in Colorado, United States

OneRTX Process & Systems Transformation Program at RTX builds a unified ERP platform using SAP S/4HANA. The SAP S/4 ABAP Backend Developer designs, develops, documents and supports ABAP applications, contributes to migration of ECC systems, and establishes enterprise-wide development standards.

Quindar builds cloud-native satellite mission operations software with the mission to operate satellites like servers, replacing fragmented legacy ground systems with an integrated, automation-driven platform. As a Backend Engineer, you will develop ground satellite operations software using Python and AWS services, design and integrate APIs, and work across backend development, generative AI integrations, DevSecOps/CI-CD tooling, and software architecture.

Space Communications team at Sphinx Defense builds a modern, scalable ground communications and data-transport platform for US government satellites. The Backend Engineer leads development of core platform services, designs and builds secure, automated APIs, and mentors junior engineers while owning problems end‑to‑end.

Vorto is on a mission to improve America’s supply chain efficiency and sustainability using AI. As a Backend Engineer you will design, build and operate high‑volume services, embed AI/LLMs to automate decision‑making, and own end‑to‑end problem solving. Based in Denver, CO with an on‑site work model, you’ll join a fast‑paced, mission‑focused squad delivering world‑class logistics systems.

Quindar builds cloud-native satellite mission operations software to operate satellites like servers, replacing fragmented legacy ground systems with an integrated, automation-driven platform. As a Backend Engineer, you will develop ground satellite operations software using Python and AWS services, design and integrate APIs, and optimize scalability, security, cost, and performance across containerized and Kubernetes-based deployments.

Oort team at Loft Orbital builds a unified web platform that centralizes infrastructure data and tools across the entire mission lifecycle. The Backend Engineer designs, implements, and operates APIs and services that collect, manage, and surface critical mission data, collaborating with program management, satellite engineering, and operations to streamline complex workflows.

Application Team at Windfall, building the system that ingests and processes customer data, the core of all customer interactions. The Backend Engineer designs and implements scalable distributed services, collaborates with product, frontend, and data teams, and models complex data for segmentation and enrichment.

Engineering at Volley Automation builds fully automated robotic parking systems, creating sustainable, compact parking solutions with EV charging. The Senior Backend Software Engineer designs, implements, and improves core backend services, data pipelines, and APIs, collaborating with hardware, operations, and product teams to deliver robust, field‑tested software.

Space Communications team at Sphinx Defense builds modern, scalable mission planning and command and control software for US government satellites. The Senior Backend Engineer leads development of core platform services, designs multi-tenant cloud APIs, and mentors junior engineers while collaborating with customers to integrate solutions.

Spire Global's Sat OS team develops the high-level operating system and file transfer layer for the company's nanosatellite constellation. As a Senior Backend Software Engineer, you will develop and enhance satellite-side applications focused on file transfer, design next-generation file transfer architecture in Rust, and ensure security, observability, and fault tolerance for critical services moving data across Spire's fleet.

DAT Backend Services team builds and scales the core SaaS platform that powers millions of freight transactions. The Staff Backend Software Engineer leads design and delivery of high‑performance Node.js microservices, drives AWS cloud architecture, and mentors engineers while handling incident response.

Cat Digital, Caterpillar’s digital arm, builds industry-leading solutions for connected assets using data and AI. This Senior Software Engineer designs scalable cloud-native backend services on AWS using Java and Spring Boot. The role involves technical leadership, mentoring, and collaborating across teams to drive engineering excellence.

Mission Operations Services (MOS) team at Loft Orbital builds backend services that enable operators to command, monitor, and automate satellite fleets via the Cockpit mission control system. The role designs, implements, and maintains Python microservices for passes, autopilots, and day‑to‑day satellite operations, collaborating with flight software, embedded, and test teams.

LG Ad Solutions seeks a Backend Software Engineer to join its Identification Engineering team in Denver. The role focuses on designing, building, and optimizing high‑performance distributed systems that process petabytes of data daily.

Semgrep backend team builds fast, reliable infrastructure and APIs that power Semgrep’s code security products at scale. The Senior Backend Engineer designs, builds and maintains backend services, optimizes databases and distributed systems, and integrates third‑party vendors while collaborating with cross‑functional engineers.

Enterprise IT team at DaVita builds and maintains the middleware, APIs, and integration platforms that connect public‑facing digital products with core enterprise systems. The Senior Backend and Integration Engineer designs, develops, and scales back‑end services, cloud database migrations, and secure integrations with Salesforce, BigQuery, and Fuse while mentoring peers and driving CI/CD standards.

Backend Capability team at CVS Health drives the backend platform, API ecosystem, and third‑party integration layer for its SaaS health suite. The role defines API standards, steers a scalable event‑driven microservices architecture, and leads integration strategy with EHR/EMR systems and emerging AI model APIs.

Launchpad team at Worldpay builds the merchant onboarding platform that streamlines payment acceptance and settlement. The Senior Backend Software Engineer designs, develops and maintains Java‑based RESTful APIs and event‑driven services, collaborates with architects, writes clean testable code, and mentors teammates in an Agile environment.

Worldpay, a global fintech leader, builds innovative payment solutions that power the world economy. As a Senior Software Engineer on the core development team, you will design, program, debug, and enhance backend .Net applications, collaborate with product managers and clients to define requirements, and participate in technical design meetings.

Leidos is hiring a Mid-Level Backend Software Engineer to build and maintain core backend services for a high-visibility, data-driven analytics and reporting application used across the organization. Day-to-day work includes designing and developing backend components in Java or Python, building RESTful APIs, applying object-oriented design, writing SQL queries, collaborating on data source integration, and troubleshooting within Linux-based environments to support system reliability, performanc