We are looking for an experienced Back End Developer to join our team in De Pere, Wisconsin, on a Contract-to-Permanent basis. This role involves designing, implementing, and optimizing backend systems to support web-facing APIs and database applications. Ideal candidates are skilled in creating efficient solutions and thrive in a collaborative environment.<br><br>Responsibilities:<br>• Develop and maintain backend systems to support web-facing APIs, ensuring functionality across versions 5 to 9.<br>• Design and implement CRUD applications to efficiently manage data operations.<br>• Optimize stored procedures and queries to enhance database performance.<br>• Collaborate on transitioning database systems from Microsoft SQL Server to PostgreSQL.<br>• Write clean, scalable code using modern programming languages and frameworks.<br>• Work closely with front-end developers to integrate backend functionality with user interfaces.<br>• Troubleshoot and resolve issues in backend systems to ensure reliability.<br>• Conduct thorough testing and debugging to maintain high-quality application performance.<br>• Document development processes and create technical specifications for future reference.

• Minimum of 5 years of experience in backend development, with 8+ years preferred.<br>• Proficiency in JavaScript, CSS, and HTML.<br>• Hands-on experience with front-end frameworks and JSON.<br>• Strong knowledge of SQL and PostgreSQL database systems.<br>• Familiarity with designing and consuming APIs.<br>• Ability to write efficient stored procedures and optimize database queries.<br>• Excellent problem-solving skills and attention to detail.<br>• Strong communication skills to collaborate with cross-functional teams.

<h3 class="rh-display-3--rich-text">Technology Doesn't Change the World, People Do.^®</h3> <p>Robert Half is the world’s first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles.</p> <p>Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. <a href="https://www.roberthalf.com/us/en/mobile-app" target="_blank">Download the Robert Half app</a> and get 1-tap apply, notifications of AI-matched jobs, and much more.</p> <p>All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit <a href="https://roberthalf.gobenefits.net/" target="_blank">roberthalf.gobenefits.net</a> for more information.</p> <p>© 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking “Apply Now,” you’re agreeing to <a href="https://www.roberthalf.com/us/en/terms">Robert Half’s Terms of Use</a>.</p>