Top Software Development Companies in Illinois
We ranked 10 software development companies in Illinois on client reviews, how many are verified, service focus and profile completeness. Updated October 2026. How rankings work
Teams that design, build and maintain software, from web and mobile apps to the internal systems a business runs on.
- Rank 1
Atlanta-based AI services firm that plans, builds and governs AI systems, agents and data platforms with nearshore engineering teams.
No reviews yet
Atlanta, GA
- AI & Automation
- Custom Software Development
- API & Integration Development
- Rank 2Down 1 from #1
Chicago digital product firm building custom web and mobile apps, AI automation and Salesforce solutions with small senior teams.
No reviews yet
Chicago, IL
- Custom Software Development
- AI & Automation
- Web Development
- Rank 3Down 1 from #2
Chicago software development partner building custom software, mobile and web apps and AI features, with product discovery and UX design.
No reviews yet
Chicago, IL
- Custom Software Development
- Mobile App Development
- Web Development
- Rank 4Down 1 from #3
Chicago consultancy that builds production AI agents, RAG systems and custom software that plug into a client's existing systems.
No reviews yet
Chicago, IL
- AI & Automation
- Custom Software Development
- API & Integration Development
- Rank 5Down 1 from #4
Chicago custom software consultancy that helps organizations decide what to build, then designs and engineers it, including AI agents and platforms.
No reviews yet
Chicago, IL
- Custom Software Development
- AI & Automation
- Product Design & Development
- Team
- 100-249 people
- Rank 6Down 1 from #5
Employee-owned software design and development consultancy building web, mobile, IoT, desktop and cloud applications, with an office in Chicago.
No reviews yet
Grand Rapids, MI
- Custom Software Development
- Mobile App Development
- Product Design & Development
- Rank 7Down 1 from #6
Employee-owned Chicago consultancy that designs and develops mobile and web apps, with backend, data and AI work and post-launch support.
No reviews yet
Chicago, IL
- Mobile App Development
- Web Development
- Product Design & Development
- Rank 8Down 1 from #7
Chicago-based digital product agency offering strategy, experience design, commerce platforms and product engineering.
No reviews yet
Chicago, IL
- Web Development
- Product Design & Development
- Custom Software Development
- Team
- 250-999 people
- Rank 9Down 1 from #8
Chicago digital product and innovation consultancy that researches opportunities, designs products and builds custom software.
No reviews yet
Chicago, IL
- Product Design & Development
- Custom Software Development
- UX/UI Design
- Rank 10Down 1 from #9
Chicago-raised experience consultancy doing research, service design, product strategy, UX/UI and conversation design, plus AI-built pilots.
No reviews yet
Chicago, IL
- UX/UI Design
- Product Design & Development
- AI & Automation
- Team
- 10-49 people
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