785 api developer jobs at 370 companies in Illinois

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
1mo
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API Engineer
Scott Air Force Base, Illinois, United States
$87k-$198k/yr HybridFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Consulting and technology services for government and commercial clients
Experienced backend/platform engineer designing, deploying, and operating enterprise API platforms; Java or Python; Docker, Helm, Kubernetes, GitOps; API gateways and cloud (AWS/Azure/GCP); Secret clearance; HS diploma or GED.
Java, Python, Apigee, Gravitee, Kong, AWS API Gateway, Mulesoft, Docker, Helm, Kubernetes, GitOps, HTTP, gRPC, WebSockets, AWS, Azure, GCP, Git, Jenkins, JIRA, Confluence, Nexus, Bitbucket, SQL, Node.js, Groovy, Scala, Spring Cloud, Spring Core, Spring Boot, Spring Data, Kafka, RabbitMQ
1mo
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API Engineer
Scott AFB, Illinois, United States
$87k-$198k/yr OnsiteFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Provides technology and management consulting services to diverse organizations.
Backend/platform engineering with Java or Python, experience operating API gateways (Apigee, Kong, Mulesoft, AWS API Gateway), DevOps (Docker, Helm, Kubernetes, GitOps), cloud (AWS/Azure/GCP), Git/Jenkins/JIRA, and eligible for Secret clearance; HS diploma/GED required.
Java, Python, Apigee, Gravitee, Kong, AWS API Gateway, Mulesoft, Docker, Helm, Kubernetes, GitOps, HTTP, gRPC, WebSockets, AWS, Azure, GCP, Git, Jenkins, JIRA, Confluence, Nexus, Bitbucket, SQL, Node.js, Groovy, Scala, Spring Cloud, Spring Core, Spring Boot, Spring Data, Kafka, RabbitMQ
2w
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Senior API Integration Engineer
Chicago, Illinois, United States
$153k/yr OnsiteFull Time
Prolaio
Prolaio: Providing a clinical intelligence platform for precision cardiology.
5+ YOEBachelor's degree, 5+ years backend experience (2+ years in integrations), strong Kotlin or Python skills, integration architecture and API expertise, GCP/Docker/Kubernetes experience, observability and security/compliance knowledge (SOC2, HIPAA).
Kotlin, Python, RESTful APIs, Google Cloud Platform (GCP), Docker, Kubernetes (k8s), BigQuery, Dagster, Datadog, Prometheus, Grafana, HL7, FHIR, DICOM, NetSuite, SAP, Airflow, Prefect, Superset, Looker
1d
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Lead API Support Engineer - 69420501
Blaine or Atlanta or Chicago
$112k-$132k/yr HybridFull Time
Cognizant
CognizantNASDAQ: CTSH: Provides IT consulting and technology services to global enterprises.
Extensive hands-on experience with Google Cloud Platform and Apigee, deep API and integration expertise, strong security and troubleshooting skills, and ability to work across distributed teams.
Google Cloud Platform (GCP), Apigee Edge, Apigee X, Apigee Hybrid, Apigee Developer Portals, CI/CD
1w
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API Engineer, Mid-Level
United States or Belleville
$100k-$150k/yr RemoteFull Time
MSM Technology
MSM Technology: Provides specialized IT infrastructure and cybersecurity services to federal agencies.
3+ YOEUS citizen with Secret clearance, HS diploma/GED, CompTIA Security+ and DOD 8570 IAT Level II, 3+ years backend/platform engineering with Java or Python, API platform and DevOps experience, and quarterly travel to Scott AFB.
Apigee, Gravitee, Kong, AWS API Gateway, Mulesoft, Docker, Helm, Kubernetes, GitOps, HTTP, gRPC, WebSockets, ZTNA, SDP, Java, Python, AWS, Azure, GCP, Git, Jenkins, JIRA, Confluence, Nexus, Bitbucket, Kafka, RabbitMQ, Node.js, Groovy, Scala, Spring Cloud, Spring Core, Spring-Boot, Spring Data
4w
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Software Engineer, API
Chicago, Illinois, United States
$108k-$110k/yr HybridFull Time
Supernova Technology
Supernova Technology: Provides cloud-based digital software for securities-based lending.
3+ YOEBachelor's in CS/Engineering, 3+ years software development with API design, experience with Java, Spring Boot, AWS, OAuth/JWT, REST, Git, CI/CD, and testing frameworks.
RESTful Services, OAuth, JWT, Java, Spring Boot, AWS, Git, CI/CD
1mo
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Lead Backend Engineer (API Architect)
Rock Island, Illinois, United States
OnsiteFull Time
CMB Regional Centers
CMB Regional Centers: Managing EB-5 investment funds for US infrastructure projects.
8+ YOERequires degree in Computer Science (or equivalent) and 8+ years software development experience; strong .NET and SQL Server skills, REST API design, API/security practices, CI/CD, testing, and stakeholder communication.
.NET, SQL Server, REST, SSRS, Power BI, CI/CD
1mo
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Third Party API - Technical Lead
Hartford or Columbus or Charlotte or Chicago
$135k-$203k/yr HybridFull Time
The Hartford
The HartfordNYSE: HIG: Provides business and personal insurance, group benefits, and investments.
8+ YOE8+ years software engineering/integration/API experience, 3+ years as a technical lead/product owner, RESTful API design, API gateways and security (OAuth, JWT, mTLS), cloud (AWS preferred), SAFe Agile, AI familiarity, strong communication, US work authorization required.
API gateways, OAuth, JWT, mTLS, AWS, SAFe Agile, AI
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
3mo
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Senior Associate, Software Application and API Developer (St. Charles, Illinois) (St. Charles, IL, US)
St. Charles, Illinois, United States
$153k-$212k/yr HybridFull Time
New York Life
New York Life: Provides life insurance, retirement income, and investment solutions.
7+ YOEBachelor's degree in CS/EE/Math or related field plus 7 years in software development; experience with .NET, REST/SOAP APIs, microservices; VB.NET, ASP.NET, C#, JavaScript, SQL Server; Excel/VBA actuarial models; hybrid work in St. Charles, IL.
VB.NET, ASP.NET, C#, JavaScript, XML, HTML, CSS, REST, SOAP, Swagger, Postman, SOAP UI, SQL Server, .NET
1mo
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API Engineering Manager
Atlanta or Florida or Georgia or Illinois or Texas
HybridFull Time
PayMitto
PayMitto: Provides embedded cross-border payment solutions for financial institutions.
7+ YOE2+ Mgmt7+ years software engineering, 2+ years managing distributed teams, strong C#/.NET and ASP.NET Core Web API experience, Entity Framework/PostgreSQL, Azure services, experience delivering complex projects, and experience with AI-assisted developer tools.
C#, .NET, ASP.NET Core, Entity Framework, PostgreSQL, Azure Functions, Azure Queues, Azure Event Hub, Azure Service Bus, Azure App Services, Claude Code, Cursor, GitHub Copilot, Azure DevOps, GitHub Actions
3mo
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Integration Engineer (EDI/API)
Chicago or Marietta or Naperville
$80k-$95k/yr OnsiteFull Time
RXO
RXONYSE: RXO: Provide asset-light transportation and freight brokerage solutions.
1+ YOEBachelor's in IT/MIS/CS; 1 year integrating roles; experience with EDI and API platforms (Apigee, Boomi, IBM Sterling File Gateway, MQ); data transformation (XML, XPATH, XSLT); AS2, SFTP, JMS; cloud (Google Cloud); IPaaS (Boomi, MuleSoft); Sterling Integrator Map Editor preferred.
EDI, API, Apigee, Boomi, IBM Sterling File Gateway, MQ, XML, XPATH, XSLT, AS2, SFTP, JMS, iPaaS, MuleSoft, Google Cloud, Sterling Integrator Map Editor
4w
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Senior Software Engineer - Customer Integrations (API)
United States or New York City or Dallas or Austin or Houston or Chicago or Nashville or Miami or Atlanta
$140k-$160k/yr RemoteFull Time
TheGuarantors
TheGuarantors: Provides lease guarantees and security deposit alternatives for rentals.
3+ YOE3+ years building backend services with Go/Java/Python/C#; strong API design, SQL/PostgreSQL, cloud (AWS/Azure/GCP/OCI) and Terraform experience; professional software engineering experience and strong communication/system design skills.
Go, Java, Python, C#, SQL, PostgreSQL, AWS, Azure, GCP, OCI, Terraform
3w
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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
Perficient
Perficient: Provides digital transformation and AI consulting for global enterprises.
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
2mo
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Senior Lead Software Engineer - Java, Spring Boot, API
Chicago, Illinois, United States
$147k-$225k/yr OnsiteFull Time
JPMorgan Chase
JPMorgan ChaseNYSE: JPM: Global financial services firm providing banking and investment solutions.
5+ YOE5+ years Java development; Spring Boot; WebFlux; SDLC; CI/CD; security; distributed systems; hands-on coding; agile practices.
Java, Spring Boot, WebFlux, CI/CD, Cloud, Software Development Life Cycle
1w
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Unqork Developer
Chicago, Illinois, United States
$110k-$140k/yr OnsiteFull Time
Tata Consultancy Services
Tata Consultancy ServicesNational Stock Exchange of India: TCS: Global provider of IT services, consulting, and business solutions.
6+ YOEUnqork development experience, Unqork Certified Associate Configurator, API and data integration knowledge, AMS/production support, cloud experience (Azure/AWS), stakeholder communication; 6+ years experience.
Unqork, API, Azure, AWS
2d
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Senior Application Developer
United States or Illinois
$110k-$140k/yr RemoteFull Time
Corpay
CorpayNYSE: CPAY: Provides corporate payment and expense management solutions.
4+ YOE4+ years professional C#/.NET development experience, ASP.NET MVC/Web API, Entity Framework, SQL Server, cloud (Azure/AWS) experience, CI/CD and source control (Git); leadership and communication skills.
.NET, C#, ASP.NET MVC, Web API, Entity Framework, JavaScript, HTML, CSS, Angular, React, SQL Server, Azure, AWS, Git, Docker, Kubernetes
1w
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Software Engineer
Peoria or Chicago
$98k-$158k/yr OnsiteFull Time
Caterpillar
CaterpillarNYSE: CAT: Manufactures construction equipment, mining machinery, and industrial engines.
2+ YOE2–4 years developing enterprise-grade frontend and backend applications; strong SDLC, APIs/integration, testing, and collaboration skills; bachelor’s degree in CS/Engineering preferred.
Next.js, React, TypeScript, Java Spring Boot, REST APIs, APIs, Azure, AWS, ADO, GitHub Actions, Jenkins, Copilot CLI, Claude Code
3w
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Software Engineer, Enterprise Item
Illinois or United States or Canada or Chicago or Los Angeles or San Francisco
RemoteFull Time
Crate and Barrel
Crate and Barrel: Retails furniture, kitchenware, and home decor products.
2+ YOE2+ years software development experience; designing and supporting APIs, microservices, and integrations. Proficiency with C#/.NET, REST APIs, SQL/NoSQL, cloud platforms, CI/CD, Agile; strong problem-solving and communication.
APIs, microservices, C#, .NET, REST APIs, AWS, Azure, GCP, SQL, NoSQL, CI/CD, Product Information Management (PIM)
1w
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.NET Developer - QMS
Aurora, Illinois, United States
$70k-$105k/yr OnsiteFull Time
QT9 Software
QT9 Software: Cloud-based QMS and ERP software for regulated industries.
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