Senior API Engineer (.NET)

Design and build enterprise-class, scalable APIs and services that power internal applications and external partner integrations. Contribute to modern cloud-native platforms, helping architecture evolve toward service-oriented, API-first, and event-driven systems.

Why Join Exadel

We’re an AI-first global tech company with 25+ years of engineering leadership, 2,000+ team members, and 500+ active projects powering Fortune 500 clients, including HBO, Microsoft, Google, and Starbucks.

From AI platforms to digital transformation, we partner with enterprise leaders to build what’s next.

What powers it all? Our people are ambitious, collaborative, and constantly evolving.

About the Client  

The leading provider of vehicle lifecycle solutions, with headquarters in Chicago, enables the companies that build, insure, and replace vehicles to power the next generation of transportation. Its platform delivers advanced mobile, artificial intelligence, and car technologies. It connects a network of 350+ insurance companies, 24,000+ repair facilities, hundreds of parts suppliers, and dozens of third-party data and service providers. The customer’s collective solutions enhance productivity and help clients deliver better experiences for end consumers.

What You’ll Do

• Design, build, and maintain internal and external RESTful APIs for distributed, multi-tier systems
• Apply microservices and service-oriented architecture principles to design scalable systems
• Contribute to cloud-native architecture evolution, including event-driven and distributed patterns
• Develop and deploy services using Microsoft Azure and modern cloud platforms
• Work across API management, messaging, and distributed system layers
• Design and optimize data models using T-SQL and relational database principles
• Ensure high performance through query optimization and scalable system design
• Implement API security, including authentication, authorization, and data protection

What You Bring

• Extensive experience in building services using C#, modern.NET/.NET Core, and ASP.NET Core Web API
• Strong expertise in RESTful API design and API-first engineering practices
• Experience with Cloud Platforms ( Azure, AWS) 
• Experience with microservices and service-oriented architecture
• Experience in relational database design, T-SQL, stored procedures and functions Experience designing large-scale distributed systems
• Hands-on experience with AI-assisted development tooling (e.g., GitHub Copilot, Claude Code, Cursor, or comparable agentic coding tools)

Nice to have 

• Familiarity with domain-driven design (DDD) and CQRS patterns
• Experience with modern.NET/.NET Core, including.NET 6+ or later, for building scalable API services
• Experience with OpenAPI/Swagger for API documentation, contract design, and client integration

English level 

Upper-Intermediate

Legal & Hiring Information

• Exadel is proud to be an Equal Opportunity Employer committed to inclusion across minority, gender identity, sexual orientation, disability, age, and more.
• Reasonable accommodations are available to enable individuals with disabilities to perform essential functions.
• Please note: this job description is not exhaustive. Duties and responsibilities may evolve based on business needs.
• In anticipation of EU Pay Transparency requirements, compensation details are shared with candidates at the early stage of the recruitment process.
• The offer is not binding until a signed contract is in place.

Your Benefits at Exadel 

Exadel benefits vary by location and contract type. Your recruiter will fill you in on the details.

• International projects
• In-office, hybrid, or remote flexibility
• Medical healthcare
• Recognition program
• Ongoing learning & reimbursement 
• Well-being program
• Team events & local benefits 
• Sports compensation 
• Referral bonuses 
• Top-tier equipment provision

Exadel Culture

We lead with trust, respect, and purpose. We believe in open dialogue, creative freedom, and mentorship that helps you grow, lead, and make a real difference. Ours is a culture where ideas are challenged, voices are heard, and your impact matters.