Software Engineer Mobile (Kotlin Multiplatform) (m/f/d)

About us

At ToolTime, we build cloud-based software for trades people — a platform that digitizes workflows, reduces admin work, and gives craft businesses valuable time back in their day. Since 2019, our mission has been to simplify every step of their operations, from creating offers to tracking time.

Behind this mission stands a diverse team of +80 talented people working together to modernize Germany’s trades industry in a meaningful and sustainable way.

What sets us apart? The energy of a modern SaaS startup combined with a strong financial foundation. With €55 million in funding and investors deeply connected to the trades sector, we’re well positioned to scale our product and impact even further.

ToolTime’s DNA is shaped by innovation, ownership, and continuous improvement — and we’re always looking for motivated people who want to push the industry forward with us.

If you’re looking for a meaningful role in a fast-growing, well-funded SaaS company, we’d love to hear from you.

️ This is a fixed-term position (6–12 months), ideal for someone looking to make a real impact in a fast-growing startup.

‍ You know you're a ToolTimer, if you:
Are self-driven, strive for excellence, and thrive among talented colleagues.
Want to shape a product with real industry impact — not just work in a ticket factory.
Value open collaboration where every voice matters.
Work best with colleagues who support you and set you up for success.
‍️ What we are looking for:
5+ years of professional experience in mobile development.
Deep experience in Kotlin Multiplatform (KMP) and building shared architecture from scratch.
Strong understanding of modular architecture, clean code, and testability.
Hands-on experience with Coroutines, Koin/Hilt, Ktor and modern architectural patterns (MVVM, MVI, Clean Architecture).
Track record of shipping and maintaining production-grade Android or cross-platform apps.
Experience integrating mobile apps with REST/GraphQL APIs.
Strong focus on delivering excellent UX and high-performing mobile experiences.
Bonus: iOS/SwiftUI experience.
Interest in the latest mobile technologies, including Kotlin, Jetpack Compose, KMP, and mobile tooling.
️ Your tasks:
Build a new KMP-based mobile application from scratch, defining architecture, module boundaries, and shared logic.
Drive key technical decisions alongside staff engineers and architects.
Collaborate closely with product, design, and backend teams to deliver features tradespeople love.
Define coding standards, best practices, and internal frameworks for the mobile codebase.
Ensure software quality through testing, CI/CD automation, and performance monitoring.
Contribute to shaping ToolTime’s long-term mobile strategy and platform direction.
How we build

Our tech stack includes Kotlin, KMP, Jetpack Compose, SwiftUI as well as GraphQL communicating with our SpringBoot and Quarkus backends on AWS. Our infrastructure is managed with Terraform.

As we expand our mobile capabilities, you will play a key role in shaping architecture and setting the foundations for long-term growth.

TechMondays: Mondays are fully dedicated to engineering — whether you want to tackle technical debt, explore new technologies, or refine infrastructure.
Tech Forums: Our transparent decision-making format where all voices are heard and the best ideas win.
A culture that values technology-first thinking, autonomy, and engineering excellence over unnecessary processes.
Your growth & development
You’ll get insights into one of the best-funded startups in the trades industry and support us in a highly exciting growth phase.
We foster a culture of curiosity, positivity, and collaboration (our core values).
We value honest feedback and continuous learning, giving everyone the space to experiment — and make mistakes.
We invest in you:
€500 Learning & Development budget per year for training, courses, and upskilling.
Plenty of room for ownership, creativity, and personal growth.
Flexibility & perks
Build your own benefits package from more than 35 partners such as Urban Sports Club, Blinkist, 7Mind, Ikea, and many more.
Access to our Corporate Benefits Portal with exclusive discounts on travel, sports, fashion, and more.
30 days of vacation, regular team & company events, plus two Company Weeks per year.
A hybrid work model: 2 days per week in our vibrant Friedrichshain office, close to Boxi & Warschauer Straße — and the flexibility to work 3 days a week remotely from home, including Workation options.

If this sounds exciting — let’s find out if we’re a good fit.

Also check out our blog.

We are committed to diversity & inclusion

At ToolTime, we believe that diverse teams build better products. We welcome people of all abilities, genders, cultural backgrounds, ages and sexual orientations.

If you’re passionate about building great technology but don’t tick every single box in the job description, we still encourage you to apply. What matters most is your mindset, potential, and drive to grow — not just your resume.