Top Software Engineer Jobs in Peoria, IL

Designs and implements scalable software solutions as a Calypso SME, integrating Calypso with market utilities, developing Java/MQ/APIs, applying Agile best practices, conducting code/design reviews, and mentoring engineers.

Design, build, and maintain backend services and APIs using Ruby on Rails. Improve performance, scalability, reliability, and write well-tested production code. Collaborate with Product, Frontend, Data Engineering, and QA teams.

Lead the engineering organization to define vision, scale teams, and deliver enterprise-grade SaaS features. Ensure reliability, security, data integrity, and high-velocity execution across product squads while partnering with Product and Exec leadership on roadmap, architecture, and build-vs-buy decisions.

Develop, deploy, and maintain the UDS Registry and related tools (Pepr, Lula). Lead architecture and implementation, integrate with defense systems, participate in on-call rotation, contribute to open source, produce documentation, mentor engineers, and influence product direction with user-focused design.

Design, develop, test, and maintain complex Workday integrations (Studio, EIBs, Core Connectors, Web Services). Collaborate with HR/payroll/IT stakeholders, ensure data integrity and security, manage integration lifecycle, troubleshoot and optimize integrations, and mentor junior analysts.

Architect, build, and maintain scalable full‑stack applications using React, TypeScript, Node.js, and AWS. Own features end-to-end, optimize performance and usability, collaborate with founders, and use AI tools to accelerate development in a fast-paced startup.

Build polished, maintainable React-based front-end product experiences; evolve front-end architecture and component patterns; translate ambiguous product ideas into executable plans; collaborate with product and design; prioritize UX quality, testing, and pragmatic tradeoffs; mentor and raise team effectiveness at the Staff level.

The SharePoint Developer will customize and manage SharePoint applications, perform .NET development, and upgrade existing sites while facilitating client requirements and providing best practices.

Lead a 3–5 person API engineering team designing and supporting credit card processing platforms. Architect and deliver microservices/event-driven solutions, ensure code quality, mentor engineers, participate in Agile ceremonies, troubleshoot production incidents, and support periodic 24x7 on-call rotations. Collaborate with product, architects, and vendors to modernize applications and maintain security and compliance.

Develop, deploy, and maintain InterSystems IRIS/Cache applications and complex HL7 interfaces (SDA, CCDA, JSON). Implement CQ Initiator/Responder workflows, support IRIS in Kubernetes (IKO), use adapters (SFTP, HL7, HTTP), troubleshoot integrations, and collaborate across teams.