Top Software Engineer Jobs in Peoria, IL

Build and maintain internal web services and UIs to support deployment workflows, strengthen CI/CD and release safety, improve observability and auditability, and operate internal services including on-call support and production rollouts.

The role involves building user-facing features, collaborating with product and design teams, and ensuring high-quality product delivery while optimizing performance across systems.

The Software Engineer will scale and optimize the platform's infrastructure, manage data layers, and enhance system operations to support growing LLM requests.

As a Software Engineer at OnePay, you will develop and implement features, build scalable products, and work closely with teams to enhance customer experiences.

Contribute to building and operating scalable cloud services, develop user interfaces, collaborate on products, and improve engineering practices.

The Software Developer designs, builds, and maintains custom software solutions, collaborating closely with product owners and development teams to deliver high-quality software while participating in Agile Scrum ceremonies.

As a Software Engineer, you will develop and maintain features using AI-assisted tools, collaborate with teams, and enhance software solutions for better user insights.

Develop, integrate, and test spacecraft flight software across the full lifecycle. Implement and upgrade cFS-based applications, perform unit-to-platform verification in simulation and HIL/FlatSat environments, support integration with hardware and payloads, and participate in anomaly resolution, mission operations support, and proposal activities.

Build and operate CrewAI's infrastructure across AWS, Azure, and GCP. Own containerized deployments, CI/CD pipelines, observability, secrets, networking, databases, and on-call reliability. Harden security, automate deployments and installs, partner with runtime and product engineers, and reduce operational toil through tooling and automation.

Build and operate Sourcegraph Cloud platform: develop inter-cloud connectivity, control plane orchestration, expose infrastructure APIs, debug and patch upstream IaC dependencies, ensure reliability and participate in on-call rotation to meet SLAs.

Develop and optimize distributed systems for syncing customer data, focus on scalability, reliability, and performance for global clients.

Design, architect, develop, and maintain OneStream Marketplace solutions using web, cloud, SQL, and enterprise platform technologies. Lead design and code reviews, define APIs and coding standards, optimize application and database performance, support deployment automation, and ensure software quality. Mentor engineers, train new hires, guide requirements discussions, approve pull requests, and collaborate with technical and non-technical stakeholders to deliver customer-focused solutions.

Own the automated testing strategy and frameworks across the company’s UI and service-oriented systems. Build risk-weighted coverage dashboards, API-based integration tests, CI quality guardrails, and AI-assisted testing workflows using Claude and MCP tooling. Coach engineers to own automated tests, reduce flaky tests and escaped defects, and lead the Quality Enablement practice. The role requires hands-on coding across unit, integration, contract, and browser testing while partnering with engineering, product, and platform teams.

Build and evolve scalable backend systems and APIs for a large SaaS platform. Partner with Product, Design, and QA from ideation through deployment, contribute to microservices architecture, improve testing and observability, identify operational risks, and mentor teammates. The role emphasizes reliable, maintainable solutions, strong collaboration, architectural decision-making, and continuous improvement.

Develops and supports software applications. The posting requires U.S. citizenship or naturalized citizenship and mandates that all work be performed within the continental United States, Alaska, or Hawaii.

Develop and improve embedded graphics and compute drivers, customize products for embedded hardware and real-time operating systems, and profile and optimize drivers and applications. Write and review technical specifications while collaborating on reliable, high-quality safety-critical solutions. The role requires embedded software development, debugging, troubleshooting, and familiarity with graphics APIs, ARINC 653, and safety-critical development practices.

Design, architect, develop, test, and support scalable full-stack applications for a high-volume, multi-tenant data platform. Own features from design through delivery, contribute to technical strategy and roadmap development, ensure operational excellence, collaborate across distributed teams, and mentor engineers. Apply cloud-native technologies and AI-assisted development practices while supporting near-real-time analytics and reliable production operations.

Build and ship robust Android features for ClassPass in a large modular codebase. Collaborate with product and design, mentor junior engineers, conduct code reviews, write technical documentation, solve complex problems, improve systems, and contribute to architectural decisions using Kotlin and Jetpack Compose.

Design, build, and maintain scalable brokerage systems supporting international markets. Develop Go-based backend services, gRPC microservices, React interfaces, and vendor integrations. Collaborate with global engineering teams to support multiple languages, currencies, and markets. Lead regional reliability efforts, act as incident commander, troubleshoot production issues, mentor engineers, and contribute to recruitment and cross-functional initiatives. Participate in on-call support and help ensure proactive 24x7 system stability.

Build and maintain Mapboxs cloud-native infrastructure and GitOps deployment platforms on AWS. Work with Terraform/Terragrunt and legacy CloudFormation/CDK, migrate services to EKS/ArgoCD, architect centralized GitHub Actions CI, configure observability (Datadog/CloudWatch), provide on-call SRE support, document designs, and lead platform strategy and developer experience improvements.

Build and operate Yahoo’s developer experience platform, including CI/CD infrastructure, artifact repositories, release pipelines, and ArgoCD GitOps deployments. Develop reusable golden-path workflows, AI-assisted automation, configuration validation, and platform tooling. Support pipeline troubleshooting, artifact management, runner optimization, observability, security practices, and developer adoption through migrations, documentation, office hours, and technical enablement.

The Principal Software Engineer will embed with product teams to solve complex technical problems, deliver production code, and make application and service-level architectural decisions. The role owns shared services, reliability, performance, incident response, and cross-system issue diagnosis. It also leads solution design, mentors engineers through influence, supports multiple products and domains, and establishes effective standards for AI-assisted software development.

Evaluate AI coding-agent interactions for usefulness, correctness, engineering judgment, reasoning quality, and developer trust. Provide clear, opinionated feedback, distinguish response-quality levels, and help define standards for excellent interactions with tools such as OpenAI Codex, Claude Code, and Cursor. This contract role requires staff- or principal-level software engineering experience and familiarity with modern AI-assisted development workflows.

Architect and refine scalable cloud infrastructure software for enterprise and internet-scale environments. Responsibilities include developing robust software, designing systems supporting 1,000+ nodes, optimizing performance, and collaborating with distributed technical teams in agile environments.

Lead architecture and delivery across Rails backends and React frontends, build Node.js and NestJS platform integrations, establish testing and code-quality standards, mentor engineers, review code, and improve reliability, performance, and developer experience. The role requires technical ownership across multiple backend technologies and leadership in AI-assisted development practices.