[Freelance Contract] - Senior Mobile Developer - Kotlin Multiplatform - Better Route (d/f/m)

About the Bettermile Route Tribe:

We revolutionize last-mile delivery for drivers worldwide with our smart route optimization. Our real-time, dynamic sequencing handles hundreds of stops, empowering thousands of drivers through the mobile app.

Our mission: enhance the daily experience of last-mile drivers, prioritizing their satisfaction and enabling real-time tracking. The Better Route app enables efficient and sustainable routes, letting drivers plan their day seamlessly. Each day brings new challenges, bring your skills and passion, and join us in transforming the delivery landscape!

Our tech stack: Kotlin, KMP (Kotlin Multiplatform), Ktor, Kotlinx.coroutines, kotlinx.serialization, Clean Architecture.

You will be taking care of

• Hands-on Development (80%): Scaling our mobile capabilities by building and refining features using Kotlin Multiplatform (KMP) across Android and iOS.

• Technical Consulting (20%): Acting as a strategic partner to the team, explaining complex technical approaches and providing a portfolio-backed perspective on best practices.

• Architectural Evolution: Accelerating the migration of existing components from pure Android to a shared KMP environment while maintaining a Clean Architecture structure.

• Stack Optimization: Implementing high-performance asynchronous code and networking using Kotlinx.coroutines, Ktor, and kotlinx.serialization.

• Seamless Integration: Maintain high standards throughout the end-to-end development lifecycle, from local development and Git workflows to opening production-ready PRs.

You check these boxes

• Proven KMP Mastery: At least 2 successful KMP projects, specifically including experience migrating a pure Android project to KMP.

• Consultancy Track Record: A minimum of 2 successful projects as a consultant with a portfolio demonstrating your ability to deliver high-impact results.

• Core Tech Expertise: Deep technical knowledge of Ktor, Kotlinx.coroutines, and kotlinx.serialization.

• Mobile Versatility: Solid experience in Android (Kotlin) and the ability to navigate iOS (Swift) and legacy Java codebases.

• Architecture Guru: A deep understanding of Clean Architecture and the ability to clearly explain your technical decisions and used approaches.

• Self-Sufficiency: A high degree of autonomy in your work, paired with fluent English communication skills (we are open to discussing only German communication as well)

It is awesome if you also are

• Berlin-based: A preference for sometimes working onsite in our Kreuzberg office (full remote is open for discussion).

Important: You use AI only within agreed security and compliance boundaries.

What is working at Bettermile like?

• We mean it when we say “cutting edge” and have a high level of creative freedom in our everyday work.

• You will be surrounded by like-minded, driven, skilled, and highly motivated people who are keen to contribute to successful solutions.

• We mean diversity, and we put it in numbers: 130+ people, 36 languages, 35% female (vs. ø26% in the tech industry), ø33 years of age, and yes, we do have Schlager-Fans among us.

• We have a very supportive and appreciative working environment with a lot of autonomy and a flat hierarchy.

• We work in a hybrid mode, with weekly team days for better collaboration and nurturing interpersonal connections. When onsite, we work in a modern, kid- and pet-friendly Better Space in the heart of Berlin-Kreuzberg.

Take your chance

Be a part of shaping a fast-growing industry and make an impact from day one. You’ll have the chance to take on responsibility early, with guidance and support from experienced mentors. We foster a learning culture, collaboration on equal footing, and quick decision-making that moves things forward.

Currently, we’re proceeding only with candidates authorized to work in Germany or who already hold a Job Seeker Visa.

About us

At Bettermile, we believe delivery shouldn’t be business as usual. We’re transforming last-mile logistics to drive efficiency and create a better delivery experience for everyone.

Our geo-based, AI-powered SaaS product handles complex address processing, dynamic routing, and navigation. It is built to manage many stops and multiple constraints.

We’re setting a new standard for the last mile and pushing the industry forward, powered by a skilled, international team of tech enthusiasts, logistics experts, and a product suite designed to keep evolving.