5 results for Back End Developer in Madison, WI

Full Stack Developer

Middleton, WI
remote
Temporary
45 - 52 USD / Hourly
We are seeking a Mid–Senior Level Full Stack Developer to support and maintain a suite of existing enterprise applications. This role will focus on stabilizing, upgrading, and maintaining legacy systems that are currently in “keep the lights on” mode.These applications will eventually be sunset, so the work will primarily involve maintenance, upgrades, and support of existing functionality rather than new product development or greenfield engineering.The ideal candidate is comfortable working within established systems, addressing technical debt, upgrades, and out-of-support components, and collaborating in an Agile environment.Key Responsibilities<ul><li>Maintain and support existing enterprise applications</li><li>Implement system upgrades and updates to ensure applications remain stable and secure</li><li>Address out-of-support technologies and compatibility changes</li><li>Troubleshoot and resolve issues in legacy application environments</li><li>Participate in Agile / SAFe ceremonies, including stand-ups, ticket management, and story refinement</li><li>Collaborate with development teams to ensure continuity of application functionality</li><li>Contribute primarily to back-end development, while still supporting full stack functionality as needed</li></ul>Required Qualifications<ul><li>Mid–Senior level developer experience (not a Lead or Architect role)</li><li>Strong experience with TypeScript</li><li>Strong experience with .NET (4.6 – current versions)</li><li>Experience working with legacy ASP.NET applications</li><li>Experience with Python (some flexibility; willingness to work in Python environments)</li><li>Experience working within Agile or SAFe frameworks</li><li>Ability to maintain and enhance legacy or enterprise systems</li></ul>Nice to Have<ul><li>Experience modernizing or supporting applications approaching end-of-life</li><li>Strong debugging and troubleshooting skills in complex environments</li><li>Experience working on backend-heavy workloads within full stack applications</li></ul>
2026-03-11T00:00:00Z

Senior Software Developer

Madison, WI
onsite
Permanent
110000 - 130000 USD / Yearly
Robert Half is seeking a Senior Software Developer to help design, build, and support business-critical applications for our client in the Madison area. This role focuses on developing reliable, scalable software systems used directly in production environments. You’ll work closely with a small, experienced engineering team supporting applications where uptime matters and problems need real solutions. We’re looking for someone who can think creatively during design, stay focused during execution, and take ownership when systems need attention. This is a remote position for Wisconsin based candidates only. What You’ll Do:<ul><li>Design, develop, and maintain core business applications supporting manufacturing operations</li><li>Build backend and full-stack solutions using modern .NET technologies</li><li>Develop and support applications hosted in Azure, including Azure SQL–backed systems</li><li>Troubleshoot production issues and participate in root-cause analysis to improve system stability</li><li>Collaborate with engineering and business partners to deliver practical, reliable solutions</li><li>Participate in occasional production cutovers or off-hours support (infrequent, typically a few times per year)</li><li>Contribute to application architecture and continuous improvement efforts</li><li>Explore opportunities to incorporate AI capabilities into applications as the organization defines its roadmap</li></ul>
2026-02-12T00:00:00Z

Java Native Developer

Middleton, WI
remote
Temporary
49.0865 - 56.837 USD / Hourly
We are seeking a Mid–Senior Level Android Mobile Developer to support and maintain a suite of existing enterprise mobile applications. This role focuses on supporting legacy applications that are currently in “keep the lights on” mode, ensuring stability while performing upgrades and addressing technology components that are reaching end-of-support.This is not a greenfield development role. The work will involve maintaining and enhancing existing applications as they move through their lifecycle and eventually toward sunset.The ideal candidate is comfortable working in legacy environments, implementing upgrades, and supporting production systems within an Agile / SAFe development framework.Key Responsibilities<ul><li>Maintain and support existing Android mobile applications built with Java Native</li><li>Implement upgrades and updates to keep applications functional and secure</li><li>Address out-of-support technologies and framework updates</li><li>Troubleshoot and resolve issues within existing mobile applications</li><li>Participate in Agile / SAFe ceremonies, including stand-ups, sprint planning, ticket management, and story refinement</li><li>Collaborate with cross-functional teams supporting backend and integration layers</li><li>Contribute to both mobile application updates and related system maintenance</li></ul>Required Qualifications<ul><li>Mid–Senior level developer experience (not a Lead or Architect role)</li><li>Strong experience building Android mobile applications using Java Native</li><li>Experience working directly with Android frameworks and SDKs</li><li>Experience with TypeScript</li><li>Experience working within Agile development environments, ideally SAFe</li><li>Ability to work within existing legacy codebases</li></ul>Nice to Have<ul><li>Experience supporting enterprise mobile applications</li><li>Familiarity with application lifecycle management and sunsetting legacy systems</li><li>Strong troubleshooting and debugging skills in production environments</li></ul>
2026-03-11T00:00:00Z

DevOps Engineer | Terraform

Monroe, WI
onsite
Contract / Temporary to Hire
35 - 40 USD / Hourly
We are looking for a skilled DevOps Engineer to join our team in Monroe, Wisconsin. This is a Contract to permanent position where you will play a key role in enhancing our cloud infrastructure and supporting development processes. The ideal candidate is eager to learn, thrives in a collaborative environment, and is passionate about enabling self-service capabilities for development teams. Responsibilities: • Collaborate with cloud engineering and development teams to design and deploy pipelines using Terraform. • Assist developers in creating automated solutions and self-service modules for streamlined deployment. • Build and maintain cloud-based infrastructure using Azure DevOps, ensuring stability and optimal performance. • Support the transition from legacy systems to modern platforms, including replacing virtual machines with Nutanix. • Train and mentor team members on DevOps best practices and tools to enhance operational efficiency. • Optimize nightly processing systems to improve business workflows. • Work closely with network, storage, security, and server teams to ensure seamless integration of DevOps solutions. • Focus on maturing pipelines and filling variables to improve deployment readiness. • Actively participate in troubleshooting and resolving technical issues related to cloud environments. • Maintain and update technical documentation to support ongoing development and deployment processes.
2026-03-03T00:00:00Z

Sr. Software Engineer

Janesville, WI
remote
Permanent
125000 - 170000 USD / Yearly
Robert Half is seeking a Senior Full-Stack Developer to lead the evolution of modern web applications and cloud-native systems for our client in Wisconsin. This role will take AI-assisted prototypes and transform them into secure, scalable, production-grade solutions. You will own application architecture across the stack and help guide the transition from legacy platforms to modern web technologies. This is a hands-on technical leadership role for someone who can move quickly, think strategically, and balance speed with long-term maintainability. Key Responsibilities Application Development<ul><li>Own and productionize modern React and TypeScript applications, refactoring prototype or AI-generated code into secure, maintainable systems.</li><li>Design and build API-first, cloud-native full-stack solutions using JavaScript/TypeScript, Node.js, and relational or NoSQL databases.</li><li>Implement complex business logic such as pricing rules, workflow automation, and multi-level authorization.</li><li>Support and modernize legacy components as needed.</li></ul>Cloud & Architecture<ul><li>Design and maintain scalable cloud-native architectures.</li><li>Develop serverless backend services and optimize database performance.</li><li>Implement secure document storage and file management solutions.</li><li>Enforce security best practices, identity management, and access controls.</li></ul>API & Database Development<ul><li>Design and optimize relational and NoSQL database schemas.</li><li>Build RESTful APIs with structured service layers and role-based access.</li><li>Implement event-driven and real-time data patterns.</li><li>Manage third-party integrations, data migrations, and ETL processes.</li></ul>DevOps & Deployment<ul><li>Establish CI/CD pipelines for automated testing and deployment.</li><li>Configure hosting environments and manage environment variables and secrets.</li><li>Implement monitoring, logging, and performance optimization.</li><li>Ensure reliability, scalability, and cost efficiency.</li></ul>Collaboration & Leadership<ul><li>Mentor team members transitioning from legacy or low-code platforms to modern web stacks.</li><li>Conduct code reviews and establish development best practices.</li><li>Translate business requirements into technical solutions.</li><li>Document architecture decisions and development standards.</li><li>Bridge rapid prototyping efforts with production-ready deployment.</li></ul>
2026-02-27T00:00:00Z