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.