About Stark
Stark builds the world's most powerful electric motorcycles.
From the VARG MX to the road?legal VARG EX & SM, our bikes have won world championships and are engineered to outperform anything with a combustion engine.
We're based in Sant Boi, Barcelona, growing fast (77% year?on?year), and building a team that will take us even further.
Our mission is to lead the way towards a sustainable motorcycle industry, by reducing plastic and CO2 pollution.
Role Overview
Stark is developing the first vehicle smart display that runs on an Android phone, enabling customers to adjust several bike settings such as engine power.
This is one of Stark's most ambitious projects and one crucial step towards being a game?changer in the industry.
What You'll Do
Own the architecture and technical direction of the Android application, making pragmatic decisions that balance quality, performance, and speed
Take end?to?end ownership of mobile features: from definition and design through development, release, and monitoring
Diagnose and resolve complex performance, memory, and stability issues, with a deep understanding of multithreading, concurrency, and data caching
Collaborate with product managers, designers, and business stakeholders to turn requirements into polished, user?centric experiences
Foster a culture of continuous improvement — challenge what could be better, share mistakes openly, and lead by example
Duties
Be a core member of a high?performance, multidisciplinary team, contributing expertise openly in technical and product discussions
Set and uphold standards for clean, stable, and extensible code across the mobile team




Drive best practices in architecture, testing, CI/CD, and tooling
Leverage AI tools as a standard part of your development workflow to ship faster and with higher quality
Partner with other engineering teams to co?design features across the stack
Stay current with mobile industry trends and proactively propose product improvements
Use data to drive decisions — A/B testing, feature flags, and experimentation frameworks to measure and validate impact
Be a role model to team members
Keep your backlog up to date and communicate frequently with engineers, product managers, and the creative team
What you will bring to Stark
5+ years of experience leading Android application development, with a track record of shipping production apps at scale
Deep proficiency in Kotlin, Jetpack Compose, and modern Android development practices
Strong command of Android architecture patterns (MVVM, MVI, Clean Architecture) and the ability to evolve them pragmatically
Solid understanding of concurrency, coroutines, flows, and performance optimisation
Experience diagnosing and resolving complex performance, memory, and stability issues
Broad knowledge of the Android SDK, including best practices, Jetpack libraries, and key third?party APIs
Strong testing mindset — unit, integration,



and UI testing as part of normal development
Data?driven approach to product development: A/B testing, feature flags, and experimentation frameworks
Ability to manage and prioritise multiple workstreams simultaneously
Proficient in English, written and spoken
Nice to have
Experience with Kotlin Multiplatform
Experience with Bluetooth
Experience in improving developer experience (CI/CD, Git strategies...)
Benefits
The chance to work on a product people are genuinely passionate about
A fast?growing company with real momentum
A creative, international team based in Barcelona
Competitive salary and benefits package
Direct access to riders, race teams, and the product — this is not a remote?from?the?product role
Subsidised lunch in our in?house restaurant
Free access to our in?house gym (including weekends!)
30 days of paid vacation
Equal Employment Opportunity
At Stark, we don't just accept difference—we celebrate it, we support it, and we thrive on it for the benefit of our employees, our products, and our community.
We are committed to creating an inclusive environment where everyone, regardless of gender identity, sexual orientation, race, religion, age, neurodiversity, or disability, feels a true sense of belonging.
We believe that diverse teams make better decisions and that a culture of equity is a prerequisite for innovation.
Accessibility:
If you require any reasonable adjustments during the application or interview process (such as assistive technology, extra time, or a specific format), please let us know at
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📌 Senior Mobile Engineer (Madrid)
🏢 Stark Future
📍 Madrid