42 api developer jobs at 30 companies in Sun Prairie, WI
🚀PromotedHiringCafe
Founding Backend / Infra Engineer
Cupertino, CA, US
$160k-$300k/yrOn-SiteFull Time
HiringCafe: Building a 100× better job search engine to take on Indeed and LinkedIn.
Own the crawlers, pipelines, and infrastructure powering a real-time job search engine. Strong Node.js and Python fundamentals; bonus points for security and reverse-engineering chops.
Whisker: Designs and manufactures automated pet care products and appliances.
2+ YOE2–3+ years web development with PHP; experience with MVC (Laravel or Symfony); REST APIs; relational databases; Agile; BS in CS/CE or equivalent.
Horace MannNYSE: HMN: Providing insurance and financial solutions to educators and their families.
7+ YOEBachelor's in CS/IT or equivalent, 7+ years software development experience, technical leadership experience, strong proficiency with Java, .NET, SQL, DB2, SSIS, C#, COBOL, APIs; DevOps/CI/CD and AI experience preferred.
Alliant EnergyNASDAQ: LNT: Provides regulated electricity and natural gas services to customers.
3+ YOE3 years related experience; preferred bachelor's in IT; experience with React, APIs, Azure, Sitecore, integrations, Agile; apply AI and DevSecOps practices.
5+ YOE5+ years backend development experience with C#/.NET, building REST APIs and SQL databases; experience with Git, cloud (Azure/AWS) and Docker preferred; Bachelor\u0002s degree in CS or equivalent experience.
C#, .NET, .NET 9, REST APIs, SQL, Git, Microsoft Azure, Microsoft Azure SQL, AWS, Docker
Syms Strategic Group: Provides IT and professional services to federal government agencies.
8+ YOEU.S. citizen with eligibility for Public Trust clearance; 8+ years software development experience with strong back-end focus (Java/NodeJS), RESTful API design, Angular front-end, AWS cloud, Git/GitHub, and healthcare data experience.
Java, NodeJS, Angular, C#, .Net, TypeScript, XML, JSON, AWS, Azure, API Gateway, Lambda, S3, CloudWatch, Git, GitHub, JUnit, Jest, Docker, ECS, EKS, JIRA, Microsoft Teams
Sentry Insurance: Provides commercial insurance, life insurance, and retirement plans.
2+ YOEBachelors required; minimum 2 years data engineering experience. Proficiency with Microsoft .NET, C#, REST API, JavaScript, ASP.NET MVC, SQL Server, Visual Studio/VS Code/SSMS, Git, Postman, Bootstrap, AutoMapper; agile and software design principles.
Microsoft .NET, C#, REST API, JavaScript, ASP.NET MVC, HTML, CSS, SQL Server, Microsoft Visual Studio, Microsoft Visual Studio Code, Microsoft SQL Server Management Studio, Git, Postman, Bootstrap, AutoMapper
Duluth Trading CompanyNASDAQ: DLTH: Retailer of workwear, casual apparel, and outdoor accessories.
5+ YOEBachelor's in CS (or equivalent), 5+ years software development, full-stack and PWA experience, proficiency with JavaScript/Python/Ruby, HTML5/CSS3/Node.js, REST APIs, strong communication, and US work authorization required.
InsperityNew York Stock Exchange: NSP: Provides human resources and business performance solutions to businesses.
5+ YOEBachelor's or equivalent experience, 5+ years in software/ML/AI engineering, advanced Python and API skills, experience with large-scale data platforms and LLM systems, familiarity with AI orchestration frameworks, strong communication.
Bruno Independent Living Aids: Manufacturer of mobility and accessibility products for homes and vehicles.
6+ YOEBachelor’s in CS or related field; 6+ years progressive exp, 3 in manufacturing; AI-first development with agentic LLM tools; polyglot across languages; SQL, REST APIs, system integrations, GIT, BI, vendor mgmt; strong prompt engineering.
Recovery.com: Matches patients with mental health and addiction treatment centers.
10+ YOE10+ years professional software engineering experience; deep TypeScript/full-stack expertise; proven architecture, API, scalability, and reliability experience; strong communication and mentorship skills.
Resource Innovations: Provides clean energy services and software solutions for utilities.
6+ YOEExpertise in PHP, Laravel, Vue.js; 10+ years with PHP frameworks; 6+ years with Vue; API design; AWS; Git; SaaS experience; testable code with Pest/PHPUnit; agile team experience.
Geospatial Backend Developer – Multiple Positions at Junior/Mid/Senior Levels
Springfield or Vienna or St. Louis or Sun Prairie
OnsiteFull Time
NV5: Provides engineering, consulting, and geospatial solutions for infrastructure projects.
2+ YOEUS citizen with active/current Top Secret/SCI clearance, Bachelor's in CS/Engineering/GIS/STEM, 2+ years backend development experience using Python/Node.js/Java, ArcGIS Enterprise experience, containerization (Docker/Kubernetes), REST API design, and cloud familiarity.
Zendesk: Provides cloud-based software for customer service and support.
3+ YOE3+ years of production software experience; backend-first with APIs, async systems, integrations, and real-time systems; ownership of features end-to-end; experience with real-time or event-driven tech such as WebSockets/WebRTC.
UnitedHealth GroupNYSE: UNH: Provides health insurance and technology-enabled health care services.
8+ YOE8+ years as a full stack developer; 5+ years C#; 3+ years FHIR/interoperability; 3+ years healthcare IT; 2+ years knowledge of data structures, algorithms, and version control (Git).
Colony Brands: Operates multi-channel retail brands and catalog sales for consumer products.
5+ YOEBS or equivalent, 5+ years software development experience, 3+ years with .NET Core/C#, REST APIs, microservices, MySQL/Dynamo, Azure DevOps, Git, AWS; strong problem solving, Agile collaboration, and mentoring ability.
Sub-Zero Group: Manufactures premium luxury kitchen refrigeration and cooking appliances.
3+ YOE3-5 years mobile development; 2+ years Flutter/Dart; RESTful APIs; cross-platform mobile app experience; UI/UX consistency; data modeling and database knowledge.
Flutter, Dart, RESTful APIs, Microsoft Dynamics CRM, Web-based CMS