110 api developer jobs at 64 companies in Fort Atkinson, WI

PromotedHiringCafe
Founding Backend / Infra Engineer
Cupertino, CA, US
$160k-$300k/yr On-SiteFull Time
HiringCafe
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.
Node.js, Python, Elasticsearch, Redis
3w
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Senior Software Engineer (Hogan API)
Hopkins or Atlanta or Chicago or Charlotte or Englewood or Brookfield or Irving
$120k-$141k/yr HybridFull Time
U.S. Bank
U.S. BankNYSE: USB: Provider of personal, business, and institutional financial services.
5+ YOEBachelor's degree or equivalent and 5+ years relevant experience. Experience with mainframe/Hogan development (COBOL, JCL, CICS), APIs, system design, testing, security, and cross-team collaboration; Scrum familiarity.
Hogan COBOL, JCL, CICS, JSON, Splunk, IMS Database, GitLab, IDz/RDz (IBM Developer for zOS), Jira
2mo
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Senior Java Developer
Milwaukee, Wisconsin, United States
$106k-$180k/yr HybridFull Time
MGIC
MGICNYSE: MTG: Provides mortgage insurance to lenders for low-down-payment home loans.
2+ YOE2-5 years Java experience; Spring, Hibernate; API development; relational databases; Agile; JUnit; ServiceNow/Jira; COBOL, Angular an asset.
Java, Spring, Hibernate, API development, Junit, Relational databases, Jira, ServiceNow, Angular, COBOL, OutSystems
2w
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Python Developer
Milwaukee, Wisconsin, United States
HybridFull Time
Neostella
Neostella: Provides legal case management and workflow automation software.
2+ YOE2+ years software development experience, proficiency in Python, API/backend development, familiarity with AWS serverless services, strong communication and problem-solving skills.
Python, Serverless Framework, AWS Lambda, AWS Step Functions, API Gateway, SQS, GitHub, Jira, Coralogix, REST, SOAP
2w
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Interactive Technology Developer (Unity)
Milwaukee, Wisconsin, United States
RemoteFull Time
Stamm
Stamm: Provides event technology rentals and managed IT services.
Strong Unity and C# proficiency, professional Unity development experience, experience integrating SDKs/APIs and hardware, familiarity with networking protocols (OSC, TCP/IP, UDP, WebSockets, HTTP/REST), camera/sensor/tracking experience preferred, strong problem-solving and communication skills.
Unity, C#, DMX, OSC, WebSockets, TCP/UDP, HTTP APIs, TCP/IP, UDP, REST APIs, MediaPipe, OpenCV, ZED, Azure Kinect, Intel RealSense, TouchDesigner, Linux, JavaScript, HTML, V systems, AI
3w
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Software Engineer III - Tech Lead
Plano or Madison
$90k-$126k/yr HybridFull Time
Horace Mann
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.
Java, .NET, SQL, DB2, SSIS, C#, COBOL, APIs, CI/CD pipelines, AI services
2w
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Software Developer (GIS)
Waukesha, Wisconsin, United States
OnsiteFull Time
Ruekert & Mielke
Ruekert & Mielke: Civil engineering and infrastructure services for municipal governments.
3+ YOEBachelor's degree or equivalent experience; 3+ years software development or GIS application experience; proficiency with JavaScript/TypeScript, Python, Esri/ArcGIS tools, AWS, SQL/NoSQL, REST APIs; strong communication and problem-solving skills.
ArcGIS Pro, ArcGIS Online, ArcGIS Enterprise, ArcGIS Dashboards, ArcGIS Field Maps, Survey123, VertiGIS Studio, AWS, SQL, NoSQL, REST APIs, Python, JavaScript, TypeScript
2w
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Enterprise Application Developer II
Madison or Cedar Rapids
$79k-$102k/yr OnsiteFull Time
Alliant Energy
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.
React, APIs, Azure, Sitecore, DevSecOps, Artificial Intelligence
1mo
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Software Engineer
Delafield, Wisconsin, United States
OnsiteFull Time
Evans Transportation Services
Evans Transportation Services: Provides third-party logistics and end-to-end transportation management solutions.
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
17h
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Python Engineer
Milwaukee, Wisconsin, United States
$100k-$130k/yr HybridFull Time
Allspring Global Investments
Allspring Global Investments: Provides global asset management and investment advisory services.
3+ YOEBachelor's degree and 3+ years Python development experience; experience with APIs, data processing (Pandas/NumPy), SQL, FastAPI, cloud/AWS, CI/CD, testing, and Agile delivery; must be authorized to work in the U.S.
Python 3.10+, Pandas, NumPy, Matplotlib, Plotly, Bokeh, Streamlit, PostgreSQL, Microsoft SQL Server, Snowflake, FastAPI, Swagger/OpenAPI, Postman, AWS ECS, AWS EC2, AWS Lambda, AWS IAM, pytest, Git, Jenkins, Docker, Kubernetes, Microsoft Power Platform, Power BI, Dataverse, SQL
2mo
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Sr. Software Engineer
Milford or Cocoa Beach or Orlando or Sioux Falls or Orlando or Jacksonville or Columbus or York Haven or Birmingham or Augusta or Nashville or Houston or Dallas or Albuquerque or Columbia or Milwaukee or McAllen or El Paso or San Antonio or Salt Lake City or Charlotte or Phoenix or Sunrise or Louisville or Sunrise
$150k-$175k/yr OnsiteFull Time
BeneLynk
BeneLynk: Provides social care advocacy and government benefit enrollment assistance.
8+ YOE8+ years software development; strong in C#/.NET; REST APIs; Azure; scalable SaaS; distributed teams; healthcare/regulatory context.
C#, NET, REST APIs, Azure, SQL, SaaS
1mo
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Application Development Engineer (Hybrid)
Madison, Wisconsin, United States
$80k-$131k/yr HybridFull Time
American Family Insurance
American Family Insurance: Provides diverse insurance products and comprehensive financial services.
2+ YOEProficiency with Guidewire (Gosu) and PolicyCenter/BillingCenter/ClaimCenter, AI/ML and generative AI integration, GW Cloud migration experience, SQL, APIs, CI/CD, SDLC, Agile; 2+ years Guidewire/product upgrade experience.
GOSU, Guidewire PolicyCenter, Guidewire BillingCenter, Guidewire ClaimCenter, PCF, GW Cloud, AI/ML, SQL, APIs, web services, CI/CD
3d
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Full Stack Developer
Madison, Wisconsin, United States
$85k-$117k/yr RemoteFull Time
Syms Strategic Group
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
4d
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^Custom Software Engineer - 6380864
Milwaukee, Wisconsin, United States
HybridFull Time
Accenture
AccentureNYSE: ACN: Global provider of management consulting and technology services.
1+ YOE1+ year IT/application support experience; familiarity with parts/inventory/order management or supply chain processes; basic SQL, APIs, batch processing knowledge; experience with ticketing tools.
ServiceNow, Remedy, Jira Service Management, SQL, APIs
2w
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Data Engineer - .NET Web Development
Middleton or Madison
OnsiteFull Time
Sentry Insurance
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
4w
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Sr. Digital Engineer
Madison or United States
$100k-$115k/yr RemoteFull Time
Duluth Trading Company
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.
JavaScript, Python, Ruby, HTML5, CSS3, Node.js, REST APIs
1mo
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Integration Developer - Integrations, Data & AI Solutions
Pewaukee, Wisconsin, United States
HybridFull Time
Boelter
Boelter: Designs commercial kitchens and supplies professional foodservice equipment.
3+ YOE3+ years software/integration or data engineering experience; hands-on enterprise integrations, APIs, databases, middleware, EDI; familiarity with SAP, Microsoft Fabric, Power BI, SQL, ETL/ELT; strong communication and AI curiosity.
SAP, Microsoft Fabric, Cleo Integration Cloud, Microsoft Power BI, SQL, ETL/ELT, EDI, APIs
2mo
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Workday Integrations Developer
Milwaukee or Charlotte or Alabama or Alaska or Arkansas or Arizona or Delaware or Florida or Georgia or Iowa or Idaho or Illinois or Indiana or Louisiana or Kansas or Kentucky or Maine or Michigan or Missouri or Mississippi or Montana or North Carolina or North Dakota or Nebraska or New Hampshire or New Mexico or Nevada or Ohio or Oklahoma or Pennsylvania or South Carolina or South Dakota or Tennessee or Texas or Utah or Virginia or Wisconsin or West Virginia or Wyoming
$38-$56/hr RemoteFull Time
Advocate Health
Advocate Health: Provides integrated clinical care through a network of hospitals.
3+ YOEBachelor's in Computer Science or related; typically 3 years Workday integration development experience; expertise with Workday Studio, EIB/Core Connectors, Extend, BIRT, REST/SOAP APIs, XSLT/XML/JSON; Jira/ServiceNow and Microsoft Office experience; rotational on-call support.
Workday Studio, EIB (Enterprise Interface Builder), Connector, Core Connectors, Workday Integration Cloud, Extend, Workday Extend, Orchestrate, Workday BIRT, Workday REST/SOAP APIs, XSLT, XML, JSON, Java, Python, Jira, ServiceNow, Microsoft SharePoint, Microsoft Teams, Microsoft OneNote, Microsoft Excel, Microsoft Word, Microsoft Outlook
2mo
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AI Solutions Engineer
Milwaukee or United States
$124k-$235k/yr HybridFull Time
Baker Tilly
Baker Tilly: Provides audit, tax, and consulting services to business clients.
3+ YOEBachelor's in CS/IT or equivalent; 3+ years in cloud apps (AWS); AI/Agent-based solutions; API data integration; Python/JavaScript; AWS containers/serverless; experience with AI tools; US work authorization.
AWS, Python, JavaScript, Node.js, React, SQL, NoSQL, Sage Intacct, APIs, Amazon Bedrock, Cursor, Windsurf, Claude Code
3w
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Sr Developer - Enterprise Integration
Milwaukee or Glendale
$89k-$105k/yr OnsiteFull Time
Johnson Controls
Johnson ControlsNYSE: JCI: Provides integrated building technologies including HVAC, fire, and security systems.
6+ YOE6+ years integration development experience; deep expertise with Azure Integration Services and Azure API Management; strong C#, .NET, REST, JSON, XML skills; CI/CD using Azure DevOps/GitHub Actions; observability with Azure Monitor and Application Insights.
Microsoft Azure Integration Services, Logic Apps, Microsoft Azure Functions, Microsoft Azure Data Factory, Microsoft Azure Service Bus, Microsoft Azure Event Grid, Microsoft Azure API Management (APIM), Microsoft Azure DevOps, GitHub Actions, GitHub Copilot, M365 Copilot, Microsoft Azure Monitor, Microsoft Application Insights, MuleSoft, C#, .NET, REST APIs, JSON, XML, Infrastructure as Code (IaC)
1mo
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Senior Software Engineer
Milwaukee, Wisconsin, United States
OnsiteFull Time
Fiserv
FiservNew York Stock Exchange: FI: Provides financial technology solutions for merchants and financial institutions.
4+ YOEBachelor's in CS/Engineering or related and 4 years software development experience in credit/debit payment processing. Experience with .NET, C#, REST APIs, Microsoft SQL, cloud platforms (AWS/Azure/GCP), GitLab CI/CD, TCP/IP, and multithreaded architectures.
.NET, C#, REST APIs, Microsoft SQL, AWS, Azure, GCP, GitLab, TCP/IP