113 api developer jobs at 75 companies in Union, IL
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Cloud & API Platforms Practice Lead (AVP)
St. Louis or Chicago or Boston or Houston or Dallas or Irvine or Minneapolis or Detroit or Alpharetta or New York City
$150k-$250k/yr OnsiteFull Time
10+ YOE5+ Mgmt10–15 years experience with 5+ years leading practices; expertise in Platform API and IBM Cloud solutions, hands-on consulting, GTM strategy, partner/channel relationships, AI delivery knowledge, and willingness to travel.
MuleSoft, Apigee, Boomi, Workato, TIBCO, Terraform, IBM Cloud
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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
1d
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Software Developer (Onsite - Huntley, IL)
Huntley, Illinois, United States
$60k-$80k/yr OnsiteFull Time
0+ YOEBachelor's degree in a relevant computer field and 0–2 years of software development experience. Requires knowledge of programming, databases, APIs, web services, and testing.
Python, Java, JavaScript, APIs, ERP, HSA, FSA, Microsoft 401k, Roth 401k
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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
2mo
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Sr. Software Engineer
Oak Brook, Illinois, United States
OnsiteFull Time
5+ YOEBS in CS or related field or equivalent; 5+ yrs distributed multi-tier software development; strong comms; lead experience; proficient in C#/NET, HTML/JS; SQL Server; API development; Agile; OOP/SOLID.
C#/.NET, HTML, JavaScript, jQuery, Angular 2+, Microsoft SQL Server, Entity Framework, API development, Git, TFVC, Visual Studio, Azure, AWS, Azure DevOps, N Telerik Kendo UI, NativeScript, Xamarin, Windows UWP, OOP, SOLID
2mo
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Android Developer Experience Lead
Holtsville or Lincolnshire or Austin or Kennesaw
$139k-$208k/yr HybridFull Time
10+ YOELead Android Developer Experience; 10+ years with Bachelor's or 7+ years with Advanced Degree; Android platform expertise; API/SDK design; Java and Kotlin proficiency.
Android Studio, Gradle, Java, Kotlin, APIs, SDKs
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Senior Software Engineer
Downers Grove, Illinois, United States
$110k-$130k/yr HybridFull Time
5+ YOE5+ years .NET software development experience, strong expertise in ASP.NET Core/Web API, EF Core, SQL Server, Microsoft Azure services, CI/CD, and modern front-end frameworks (Angular or React). Bachelor's in CS or related (or equivalent experience).
.NET (6/7/8+), ASP.NET Core, Web API, Entity Framework Core, ASP.NET MVC, Angular, React, TypeScript, JavaScript, SQL Server, Microsoft Azure, Microsoft App Service, Microsoft Functions, Microsoft Azure SQL, Microsoft Application Insights, Azure DevOps, GitHub Actions, Git, CI/CD
4w
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API Product Manager
Itasca or United States
$150k-$180k/yr RemoteFull Time
5+ YOE5+ years product management experience (fraud, identity, payments, or SaaS); knowledge of RESTful APIs and OAuth/SAML; vendor and data provider management; developer experience and partner integrations.
RESTful APIs, OAuth, SAML, Shopify, Salesforce, Ping Identity
3mo
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Lead Web Technologies Developer
Deerfield, Illinois, United States
$105k-$165k/yr HybridFull Time
8+ YOEBachelor’s degree in CS or related field; 8+ years web development; Next.js, React, Angular, Node.js; Git, CI/CD; experience with commerce platforms, CMS, APIs, CDNs, PIM/DAM; enterprise/open-source; agile; data privacy; strong documentation.
Next.js, React, Angular, Node.js, Git, CI/CD, Shopify, Commercetools, Bloomreach CMS, Sitecore, WordPress, Embraco, Web Services, Web API, Akamai, Cloudflare, Widen, Salsify, Stibo, JIRA, Azure DevOps, AI tools for testing, Agile/Scrum/Kanban/xp
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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
2d
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Senior AI/ML Engineer
Glenview, Illinois, United States
$162k-$203k/yr HybridFull Time
7+ YOERequires 7+ years of software development experience, including 2+ years delivering enterprise AI solutions; Python, AI/ML, LLM APIs, prompt engineering, RAG, embeddings, vector search, and production software experience.
Python, GitHub Copilot, Claude Code, Azure AI Foundry, Azure AI Search, Copilot Studio, Amazon Bedrock, Amazon SageMaker, Amazon Q, OpenSearch, Pinecone, pgvector, SQL Server, Oracle, Microsoft Fabric, Microsoft SharePoint, AWS Lambda, Azure Functions, RAG, LLM APIs, APIs, embeddings, vector search, Microsoft Azure, AWS
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Senior Software Engineer
Downers Grove, Illinois, United States
$110k-$130k/yr HybridFull Time
5+ YOE5+ years with Microsoft stack (.NET 6/7/8+, ASP.NET Core, Web API, EF Core), SQL Server, Azure services, CI/CD and Git; bachelor\u0002s degree or equivalent experience; strong API, security, testing, and mentoring skills.
.NET, .NET 6, .NET 7, .NET 8, ASP.NET Core, Web API, Entity Framework Core, ASP.NET MVC, Angular, React, TypeScript, JavaScript, SQL Server, Microsoft Azure, App Service, Functions, Azure SQL, Application Insights, CI/CD, Git, Azure DevOps, GitHub Actions
3w
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Senior Developer - IT
Arlington Heights, Illinois, United States
$112k-$147k/yr OnsiteFull Time
4+ YOEBachelor's in CS/CE/EE/MIS,4+ years software development experience, AWS and backend API experience (Java/Node/Python), CI/CD, Kubernetes, Git, cloud platforms, Agile, strong communication; must be authorized to work in the US.
AWS Lambda, AWS Step Functions, Amazon CloudWatch, Amazon CloudFront, Amazon Cognito, Amazon Route 53, Amazon DynamoDB, Amazon ECS, Amazon EC2, Amazon S3, Amazon RDS, Amazon RDS - Aurora Postgres, Active MQ, Secrets Manager, Parameter Store, Amazon EFS, Git, Python, Bash, PowerShell, Node.js, Java, Springboot, Angular 15, Github, Harness, Artifactory, Kubernetes, Microsoft .Net Framework, Microsoft .Net Core, SQL, NoSQL, JSON, XML, OAuth, Claude, Agentic AI, CoPilot, AWS, Azure, GCP, Jira, Confluence, Microsoft Azure DevOps
3d
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Senior Developer (Informatica P360)
Pittsburgh or Glen View
$82k-$139k/yr RemoteFull Time
5+ YOE5+ years development experience delivering and supporting enterprise solutions; expertise with Location MDM, integrations, data quality, SDLC and Agile; strong communication and technical documentation skills.
Informatica P360, MDM, SDLC, Agile, APIs
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Full Stack Engineer
Schaumburg, Illinois, United States
$115k-$130k/yr HybridFull Time
2+ YOE2+ years full stack development experience with React, Python, SQL and AWS; ability to read and improve existing codebase, consume/develop REST APIs, and work in a hybrid team environment.
React, Python, SQL, AWS, Athena, S3, DynamoDB, API Gateway, Amplify, CloudFront, Git, TypeScript, REST, Jira
3w
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ABAP Developer Analyst
Northbrook, Illinois, United States
OnsiteContract
5+ YOE5+ years hands-on SAP ABAP development experience; ability to translate functional requirements into ABAP code, create technical designs and unit tests, strong debugging and communication skills.
SAP ABAP, ABAP Structured Programming, Object-Oriented ABAP, OOABAP, Dialog Programming, User Exits, Enhancements, SAP BTP, SAP Build, SAP ERP SD, SAP MM, SAP FI, SAP ECC 6.0, SAP HANA, mySAP.com, Classes & Methods, BADIs, IDOCs, ALE, Workflow, BAPIs, APIs, Web Services, SAP Fiori, CDS Views, AMDP Views
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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
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Staff Software Engineer - FinOps
Lake Forest, Illinois, United States
$124k-$207k/yr RemoteFull Time
5+ YOEBachelor's or equivalent,5+ years software engineering experience,FinOps and cloud financial governance expertise across AWS/GCP/Azure,fullstack and API development,Infrastructure-as-Code (CloudFormation,CDK,Terraform),distributed systems.
AWS, GCP, Azure, CloudFormation, CDK, Terraform
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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
3w
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Lead Architect (Requiring AI and API Integration Experience)
Northbrook or Irving or Scottsdale or Chicago or Hartford
$118k-$261k/yr HybridFull Time
5+ YOEDesign end-to-end solution architectures for complex initiatives; deep API/microservices, cloud (GCP/AZURE/AWS), Kafka, and 5+ years design/development experience; 2+ years hands-on AI/ML (GenAI) experience; leadership and coaching skills.
Apache Kafka, GCP, AZURE, AWS
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