Senior API Engineer (.NET)

Posted Yesterday
Be an Early Applicant
Hiring Remotely in Bulgaria
Remote
Senior level
Mobile • Software
The Role
Design, build, and maintain scalable, cloud-native RESTful APIs and microservices using .NET and Azure/AWS. Contribute to API-first, event-driven architectures, optimize T-SQL relational models, implement API security, and collaborate across API management, messaging, and distributed system layers.
Summary Generated by Built In

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
  • 5+ years of experience 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
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.

Skills Required

  • 5+ years building services using C#, .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) and deploying cloud-native services
  • Experience with microservices and service-oriented architecture
  • Relational database design, T-SQL, stored procedures and functions
  • Experience designing large-scale distributed systems
  • Implement API security including authentication, authorization, and data protection
  • Hands-on experience with AI-assisted development tooling (e.g., GitHub Copilot, Claude Code, Cursor)
  • Familiarity with domain-driven design (DDD) and CQRS patterns
  • Experience with modern .NET/.NET Core (including .NET 6+ for building scalable API services)
  • Experience with OpenAPI/Swagger for API documentation and contract design

Exadel Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Exadel and has not been reviewed or approved by Exadel.

  • Fair & Transparent Compensation Pay is considered competitive for certain roles and locations, with timely and predictable payroll practices. Compensation ranges align to market in higher‑cost geographies and senior tracks, indicating offers can be strong when role and market justify it.
  • Healthcare Strength U.S. medical insurance options are described positively, with health coverage and PTO called out as standouts. Company materials and third‑party listings consistently include comprehensive healthcare as a core benefit.
  • Wellbeing & Lifestyle Benefits Flexible, remote‑first norms and outcome‑based work are positioned as core benefits. Learning support such as paid certifications, courses, and conferences is emphasized, alongside a well‑being program.

Exadel Insights

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The Company
HQ: Walnut Creek, CA
1,549 Employees
Year Founded: 1998

What We Do

For more than 20 years, Exadel has been delivering Digital Transformation services, enterprise and custom software solutions for Fortune 500 clients, including HPE, Deloitte, Home Depot and McKesson. With 20+ locations and delivery centers across the US and Europe, Exadel solves the most complex engineering problems using Agile methodologies, offering a scalable and skilled mix of multi-shore resources at the industry's most competitive price. Exadel’s digital transformation solutions and services help chart new strategies that are built upon creative thinking, cutting-edge design, and technical innovation, designed for the growing digital landscape of business. Enterprise Services - Digital Transformation Experts - Developing mission-critical software and mobile applications - Advising companies on how best to leverage open source technology - Helping companies plan and implement migrations to better technology stacks - Providing QA, automation, and testing services for application development - Supporting and maintaining applications and systems for companies - Providing on-line training and mentoring to companies - Assisting companies in evaluating their current enterprise software architecture and planning for improvements or new systems.

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