64 api developer jobs at 44 companies in Bradley, IL
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iSeries Developer
Bedford Park, Illinois, United States
$90k-$120k/yr HybridFull Time
Proven full-lifecycle development experience on iSeries/AS400 using RPG IV/ILE, RPG Free, CL and embedded SQL; experience with VS Code, APIs/web services, and P&C insurance knowledge.
RPG IV/ILE, RPG Free, CL, SQL, APIs, Visual Studio Code, ChatGPT, Claude
1mo
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.NET Developer - QMS
Aurora, Illinois, United States
$70k-$105k/yr OnsiteFull Time
1+ YOEMust have .NET experience with C#, ASP.NET MVC/Web Forms, Web API, and SQL Server; Bachelor's degree in Computer Science/Engineering; 1+ years professional development experience; strong OOP and problem-solving skills.
.NET, C#, ASP.NET MVC, ASP.NET Web Forms, Web API, SQL Server
1mo
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Senior MES Developer
Hanoi or Hung Yen or Lisle
OnsiteFull Time
6+ YOE6+ years software development (4+ backend) with strong Java 17+/Spring Boot, REST API, high-concurrency transactional systems; experience with Progress/PostgreSQL, Kafka, Angular, observability, performance tuning, and CI/CD tools (Jira, GitLab).
Java 17+, Spring Boot, REST API, Progress, PostgreSQL, Kafka, Angular, TypeScript, Opcenter, Camstar, SAP, WMS, DataHub, Prometheus, Grafana, Playwright, Jira, GitLab
2w
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AI Developer and ERP support
Portage, Indiana, United States
OnsiteFull Time
Bachelor's in CS/SE/IT or equivalent experience; proficiency with AI-assisted development, LLMs, SQL, APIs, relational databases; strong analytical and communication skills.
large language models (LLMs), SQL, APIs
1mo
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Lead Software Engineer
Downers Grove, Illinois, United States
$120k-$130k/yr HybridFull Time
8+ YOE8+ years Microsoft-stack software development, expertise in .NET (6/7/8), ASP.NET Core/MVC, Web API, EF Core, Azure services, Microsoft SQL Server, JavaScript/TypeScript and modern front-end (Angular/React); experience with CI/CD, observability, secure coding, and leading engineering delivery.
.NET 6/7/8, ASP.NET Core, Web API, Entity Framework Core, ASP.NET MVC, Angular, React, JavaScript, TypeScript, HTML5, CSS, Microsoft SQL Server, Azure, App Service, Functions, Azure SQL, Storage, Application Insights, Azure DevOps, GitHub Actions, CI/CD, API gateways
3mo
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Tosca Automation Engineer
Columbus or Merrillville
$75k-$105k/yr HybridFull Time, Contract
5+ YOEFive+ years QA automation; 3+ years Tosca; SAP and Salesforce; API testing (REST/SOAP); SDLC, Agile/DevSecOps; strong communication.
Tosca, SAP, Salesforce, REST API, SOAP API, JSON, XML, Jenkins, Azure DevOps, qTest, NeoLoad
1w
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Software Engineer - Commerce & Integrations
Lisle, Illinois, United States
$138k-$206k/yr OnsiteFull Time
5+ YOE5+ years backend software engineering with PHP, REST APIs, relational DB design, integrations experience; 1+ year lead experience; strong communication and CI/CD familiarity.
PHP, REST API, MySQL, PostgreSQL, Azure Pipelines, Docker, Kubernetes, AKS, Copilot, Claude Code, Spryker Cloud Commerce OS, Magento, Shopware, BigCommerce, CDK, Procede, Karmak, SAP, EDI, Punchout, cXML, OCI, Azure
1w
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AI Solutions Engineer
Lockport, Illinois, United States
$75k-$95k/yr HybridFull Time
Build internal AI tools and prototypes, work with APIs and MCP servers, connect systems, demonstrate programming and integration experience, and pass drug screen and hands-on testing.
APIs, MCP servers, GitHub
1mo
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Lead Software Engineer
Downers Grove, Illinois, United States
$120k-$130k/yr HybridFull Time
8+ YOE8+ years with Microsoft technology stack (.NET 6/7/8, ASP.NET Core, Web API, EF Core), 5+ years web and SQL Server experience, Azure and CI/CD experience, strong frontend (Angular/React, TypeScript) and observability, bachelor’s degree or equivalent experience.
.NET 6/7/8, ASP.NET Core, Web API, Entity Framework Core, ASP.NET MVC, Angular, React, JavaScript, TypeScript, HTML5, CSS, Microsoft SQL Server, Azure App Service, Azure Functions, Azure SQL, Azure Storage, Application Insights, Azure DevOps, GitHub Actions
3w
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Senior .NET Application Developer
Lisle, Illinois, United States
$65-$70/hr HybridContract
10+ YOE10+ years professional software development with Microsoft stack (C#, .NET, ASP.NET Core), SQL Server, front-end frameworks, and DevOps tools.
C#, .NET Framework, ASP.NET, ASP.NET Core, MVC, Web API, ADO.NET, Entity Framework, WCF, SQL Server, HTML5, CSS, Bootstrap, JavaScript, jQuery, Angular, React, JSON, AJAX, Azure DevOps, GitHub, TFS, Visual Studio, VS Code, Postman, SoapUI
2mo
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Software Engineer II (Oak Brook, IL, US)
Oak Brook, Illinois, United States
$87k-$133k/yr OnsiteFull Time
2+ YOEBachelor's degree in Computer Science/Software Engineering and 2+ years in software development; strong C# or TypeScript/Node.js; SQL (PostgreSQL/MySQL); cloud experience (Azure/AWS); Git; REST APIs; debugging and problem-solving; team player.
C#, TypeScript, Node.js, SQL, PostgreSQL, MySQL, Azure, AWS, Git, REST APIs, Terraform (Preferred), Atlassian tools (Preferred)
2w
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Software Engineer (Hybrid) Bolingbrook, IL
Bolingbrook, Illinois, United States
$105k-$108k/yr HybridFull Time
3+ YOE3+ years professional C#/.NET experience, UI framework and modern JavaScript/CSS skills, API and SQL proficiency, strong problem-solving and communication.
C#, Microsoft .NET, Razor, Blazor, React, Angular, Vue, JavaScript, CSS, REST, JSON, SQL
1mo
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Lead NetSuite Developer
Merrillville, Indiana, United States
OnsiteFull Time
7+ YOE7+ years software development experience with manufacturing focus; strong JavaScript and SQL; ERP customization and API design experience; leadership and mentoring skills; English proficiency.
NetSuite, JavaScript, SQL, Microsoft 365 Copilot
2mo
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Sr. Software Engineer
Wayne or Naperville
$120k-$135k/yr HybridFull Time
5+ YOE5–7 years backend engineering or intelligent systems with production impact; strong Python, CI/CD, and system design; experience with ML model APIs and cloud inference; familiarity with vector databases and retrieval systems.
Python, CI/CD, AWS Bedrock, Azure OpenAI, Google Vertex AI, PyTorch, Hugging Face Transformers, vLLM, FAISS, Pinecone, OpenSearch/KNN, LangChain, LlamaIndex, MLflow, Weights & Biases, Prometheus
2mo
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Platform Software Engineer
Oak Brook, Illinois, United States
$160k-$170k/yr OnsiteFull Time
Proficiency in Python, REST API design, FastAPI and React, cloud deployment on Microsoft Azure, containerization (Docker/Kubernetes), MS SQL, Git, CI/CD and IaC (Terraform/Bicep/ARM), healthcare standards (EDI X12, HL7, FHIR) and HIPAA security.
Python, Selenium, OpenCV, FastAPI, React, RESTful APIs, EDI (X12), HL7 (v2/v3), FHIR (R4), Microsoft Azure, Microsoft App Services, Microsoft Azure Functions, Microsoft Logic Apps, Microsoft Azure SQL, Microsoft Key Vault, Microsoft Entra ID, Microsoft Azure Monitor, Microsoft Azure DevOps, GitHub Actions, Terraform, Bicep, ARM templates, Microsoft SQL Server, Docker, Kubernetes, Git, OCR, NLP, RBAC
1mo
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Lead Software Engineer
Downers Grove, Illinois, United States
$120k-$130k/yr HybridFull Time
8+ YOE8+ years in Microsoft stack engineering (.NET, ASP.NET Core, EF Core), Azure, SQL Server, front-end (Angular/React), CI/CD, automated testing, observability, and leadership/mentoring experience; Bachelor’s in CS or related (or equivalent).
.NET 6, .NET 7, .NET 8, ASP.NET Core, Web API, Entity Framework Core, Angular, React, JavaScript, TypeScript, HTML5, CSS, Microsoft SQL Server, Microsoft Azure, Azure App Service, Azure Functions, Azure SQL, Azure Storage, Application Insights, Azure DevOps, GitHub Actions
2w
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Team Solutions Engineer - Enterprise
Downers Grove or Frisco
$84k-$152k/yr OnsiteFull Time
2+ YOEHigh school diploma required; 2+ years telecom/IT or API integration experience; hands-on REST API and Postman experience; strong technical presentation and communication skills; STEM bachelor\u0002s preferred.
REST API, Postman
2mo
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Sr. Software Engineer
Oakbrook Terrace, Illinois, United States
$96k-$128k/yr OnsiteFull Time
5+ YOE3+ Mgmt5+ years software development experience, 3+ years technical lead experience; proficiency with C#/.NET, web technologies, SQL Server, EM frameworks, API development, and strong communication skills.
C#/.NET, HTML, JavaScript, CSS, jQuery, Angular, Microsoft SQL Server, Entity Framework, Git, TFVC, Visual Studio 2017+, Microsoft Azure, AWS, Azure DevOps, Telerik Kendo UI, NativeScript, Xamarin, Windows UWP, HoloLens, Artificial Intelligence, Machine Learning, AI Chatbot, IoT
2w
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iSeries Developer
Bedford Park, Illinois, United States
$90k-$120k/yr HybridFull Time
Experience developing and maintaining iSeries/AS/400 applications using RPG, CL and embedded SQL; full lifecycle delivery, problem-solving, and P&C insurance knowledge preferred.
RPG IV/ILE, RPG Free, SQL, CL, Visual Studio Code, IBM i, AS/400, ChatGPT, Claude, APIs, web services
1mo
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Senior Engineer - Software
University Park, Illinois, United States
$78k-$134k/yr OnsiteFull Time
5+ YOEBachelor's in software engineering,5+ years engineering experience,web and mobile service development,proficiency with SQL,C#,C++,JavaScript/.NET,REST APIs,strong communication and design skills.
SQL, JavaScript, Angular, React, JQuery, Vue, C#, C++, ASP, .NET Core Framework, REST APIs, Atlassian, SIP, SMS, SMTP, SNMP, HTTPS, RS232, RS485, VoIP, SCADA
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