Full Stack Software Engineer
Full Stack Software Engineer Arlington Heights, IL - Onsite 4 days a week
About the Opportunity:
Thrively is partnering with an established organization that is modernizing the technology that powers its business. Our client is hiring multiple Full Stack Software Engineers to join a small, collaborative team building and modernizing internal applications used by more than 1,000 employees. You’ll work across the full stack using C#/.NET, React, SQL and relational databases while helping migrate legacy applications to a modern web environment. The team is also actively incorporating AI-assisted development into how they build, test and deliver software.
What You’ll Be Doing:
- Build and maintain full-stack web applications using C#/.NET, React and SQL
- Modernize legacy applications and move them to a modern web-based environment
- Develop across frontend, backend and database layers
- Work directly with internal users to understand business needs and build practical solutions
- Write and maintain automated tests
- Participate in Agile development, daily standups and sprint planning
- Use AI-assisted development tools, including Cursor, as part of the development process
- Collaborate with developers, QA and technology leadership on technical decisions and future development
What We’re Looking For:
- Full-stack web application development experience
- Experience with C#/.NET or a comparable object-oriented development language
- Experience with React or another modern JavaScript framework
- Strong SQL and relational database experience
- Understanding of APIs and modern web application development
- Experience with automated testing and Agile development
- Interest in AI-assisted software development
- Strong communication skills and comfort working directly with business users
- Curious, self-directed and comfortable learning new technologies What Makes Someone Successful Here:
- Comfortable working across the full stack
- Pragmatic approach to balancing quality, speed and business needs
- Strong problem-solving skills and genuine technical curiosity
- Ability to communicate and collaborate with both technical and non-technical teams
- Self-starter who enjoys learning and experimenting with new technology
- Team-first mindset with low ego and high ownership What Our Client Offers:
- Small engineering team with meaningful ownership and visibility
- Full-stack environment built around C#/.NET, React, SQL and relational databases
- AI-assisted development using Cursor, with access to Claude, Gemini and Perplexity
- Opportunity to modernize business-critical applications and help shape what comes next
- Collaborative engineering culture focused on learning, experimentation and delivering great solutions
- Direct access to technology leadership and the users you’re building for
- Hybrid schedule with 4 days onsite in Arlington Heights and 1 day remote If you’re a full-stack engineer who wants ownership, modern technology, AI-assisted development and the opportunity to make a visible impact on a small team, we’d love to connect.