Kotlin Developer Jobs in Naperville, IL (NOW HIRING)

Who we are:

At Focused, we move quickly to deliver quality software that achieves client outcomes and meets their customer's needs. We strategically partner with our clients to leverage our expertise in design and software, while our clients bring their own domain expertise. We work with a variety of clients from different industries, collaborating as we get new products to market, modernizing legacy systems, or helping teams learn the skills they need to be successful.   

Our values:

• Listen first We are experts in product practices but life long learners in the domain of our customers. We research, collaborate, and understand. 
• Learn why We ask questions and talk to users to understand problem spaces, objectives, and goals, which allows us to deeply invest and drive towards the outcomes of our clients. 
• Love your craft We love diving into a variety of domains and solving problems.  We take pride in delivering value, in communicating progress, and guiding our clients to success.

At Focused, our Engineers are both practitioners and experts in their craft. This role would play a crucial role in shaping and implementing engineering best practices and ensuring the successful delivery of complex software projects. With clients, we develop trust and influence - we are unintimidated and unintimidating. With colleagues, we set the standard for how we deliver success for clients.

What would you be doing?

• Writing lots of code
• Lead teams through end-to-end delivery across the stack, from backend services to modern web UIs.
• Pair program daily with teammates and clients to share knowledge, improve code quality, and grow together.
• Practice TDD and continuous refactoring to ensure code is reliable, maintainable, and understandable.
• Guide architecture decisions to support scalability, observability, and performance.
• Collaborate closely with designers, product managers, and stakeholders to continuously deliver valuable software.
• Coach developers on the team through pairing, mentoring, and modeling healthy engineering culture.
• Influence technical direction beyond the team, working across client orgs and Focused's internal practices to share lessons, shape approaches, and raise the collective bar.
• Stay curious through experimenting with new patterns in the GenAI space, share what works (and what doesn't), and help evolve how we build AI-powered software.

• You're a hands-on, full stack engineer with a strong track record of delivering software in collaborative, agile environments.
• You've worked with native iOS and Android development (Swift/Kotlin), and have an interest in learning agentic AI tooling as it becomes more relevant to mobile development.
• You believe that code quality matters, and that TDD and pairing help build better systems and stronger teams.
• You've worked across multiple languages or frameworks and have deep expertise in Swift and Kotlin.
• You're excited about what's happening in the AI space but stay focused on delivering value.
• You have experience navigating complex organizations, building bridges across functions, and helping teams adopt modern development practices.
• You're as comfortable in the code as you are in a client meeting and can translate technical risks and wins into language anyone can understand.
• You love to share what you're learning and make the team around you better.

If you had worked at Focused over the last 3 months you may have:

• Paired with a teammate to build a native iOS feature using Swift and SwiftUI
• Helped design an architecture that modernizes a legacy mobile app's data layer for offline-first support
• Refactored a flaky test suite to support continuous delivery with confidence
• Built and deployed a new Android MVP feature using Kotlin and Jetpack Compose
• Facilitated an architecture spike to evaluate cross-platform code-sharing options between iOS and Android
• Contributed a new section to our internal playbook on using Claude and Codex for mobile development
• Helped write this job req

What to know before you apply: 

• This role will require being in the Chicago office three days per week and up to 20% travel within the United States.
• Focused is unable to sponsor or take over sponsorship of the employment Visa process at this time.
• The Chicago base salary range for this role is $120,000 - $175,000.