Hire Kotlin Developers
Senior Kotlin developers who build high-performance Android apps and the backend systems behind them — with a clean, maintainable codebase you own.
Go live in 6–12 weeks with a production-ready Kotlin app
Android, Jetpack, and Kotlin Multiplatform expertise
Mobile and backend under one team
Why hire Kotlin developers from 6sense HQ?
“Their strong technical skills and speed of development are super impressive.”
6sense HQ gives startups what they need most: fast, structured development with excellent technical skills. Their Agile process, clear communication, and flexibility made them a dependable partner for delivering features on time. — Gabriel Sotomayor, Founder, Impromek
5.0/5Project
Custom sports marketplace built by 6sense HQ to connect athletes and coaches.
Country
USA
“I find it comforting that they follow the schedule they provided me with. It establishes trust between us.”
5.0/5
Common challenges in hiring Kotlin developers
Misaligned expectations
Clear scope, weekly demos, and one point of contact keep everyone on the same page.
Low code quality
We follow Kotlin best practices with Jetpack and Kotlin Multiplatform for clean, maintainable code.
Apps that work in the demo, not the field
We test on real devices and real network conditions before release.
Security concerns
NDA before any discussion, private repositories, and strict access controls.
Lack of scalability
Architecture designed for growing users and complex features from day one.
What you'll get
Efficient, scalable backend services with Kotlin and Spring Boot
Optimized, maintainable code following best practices
Integrations with APIs, payment systems, hardware, and third-party services
Future-ready apps with Kotlin Multiplatform support
Is this the right fit?
How AI fits our work
Our senior engineers direct AI that writes code underneath them — and they review and own every line that ships. AI accelerates the work; it never decides what's right.
Faster from day one
AI turns your roadmap into a structured spec and first working direction in days, not weeks.
The repetitive work, automated
Boilerplate, tests, and documentation are AI-generated and engineer-reviewed.
A senior engineer owns the result
You're never handed raw AI output.
You own what it produces
Code, docs, and IP are yours.
How we work with you
New software end to end, from architecture to launch.
Make slow, breaking, or fragile systems reliable enough to build on again.
Add senior Kotlin engineers to grow and run what you have, with a team that stays on it.
Tech stack expertise
Kotlin, Android, Jetpack, Kotlin Multiplatform
Spring Boot, Ktor, Micronaut
PostgreSQL, MySQL, MongoDB
AWS, GCP, Docker, Kubernetes
GitHub, GitLab, Jenkins
JUnit, Espresso, MockK
Why 6sense HQ
| Factors | Freelancers | Agencies | 6sense HQ |
|---|---|---|---|
| Risk | High | Medium | Low |
| Control | Low | Medium | High |
| Speed | Medium | Medium | High |
| Accountability | One person | Account manager | Senior team owns delivery |
| Code & IP ownership | Varies | Often restricted | Yours, under US jurisdiction |
Risk
Control
Speed
Accountability
Code & IP ownership
EV charging · US
Bookings, payments, access control, and live monitoring, with OCPP so multiple charger vendors work without hardware lock-in.
Connected devices · under NDA
Firmware and BLE companion software, exercised on hardware we ship to the engineers — not on a simulator alone. The client name stays private.
How we start
A senior engineer, often our CTO, finds the real constraint and what's worth building, fixing, or leaving alone.
One clear outcome. Your stack, vendors, and team stay.
The code, the data, the roadmap. No lock-in.
Driver apps, charger control, and payments
Driver, field, and dispatch apps
Companion apps for smart hardware (BLE, firmware updates)
Secure mobile payment flows
Fast, responsive shopping apps
Mobile clients for multi-user systems
Why our Kotlin developers are different
Clean architecture for scalability and maintainability
Real-device testing before every release
AI-accelerated, engineer-reviewed code
Agile delivery with weekly demos
Performance-optimized apps built for long-term growth
Talk to an engineer. Free 30-minute technical review, often with our CTO. No obligation.
