Mobile Engineer (f/m/d) in Berlin

• Wir suchen
• We're looking for

At thermondo, our mission is todecarbonize every home, and technology is our primary lever for change.

We are disrupting a massive industry bogged down by legacy systems and manual work.

This is where you come in.

We build the intelligent software and automation that gives us a decisive edge, allowing us to operate at a scale and efficiency our competitors can't match.

We are looking for a skilled and motivated Mobile Engineer (f/m/d) to contribute directly to the development of our native mobile applications, with a strong focus on Android, and multi-platform solutions.

This role is ideal for a hands‑on engineer who is eager to grow their technical scope, take ownership of software development, and contribute to both mobile and adjacent full‑stack systems.

• Wenn Du daran Spaß hast
• If you enjoy this
• Lead Development of Native Mobile Features.

You will architect, develop, test, and maintain high-quality features for our native Android/i OS applications (Kotlin Multiplatform Mobile), focusing on efficient UI implementation, state management, and robust data integration.

• Drive Mobile Architecture.

You will design and implement technical architectures, focusing on best practices for performance tuning, offline/online capabilities, and stability in our mobile applications.

• Lead Integration Efforts. You will collaborate closely with backend and platform teams to ensure reliable, scalable integration of mobile features and complex API interactions.
• Take End-to-End Ownership.

You will take full ownership of large-scale projects and epics from definition to deployment, translating complex business requirements into robust technical implementation plans.

• Spearhead AI Implementation.

You will design, implement, and support scalable patterns for integrating pre‑defined LLM services and AI‑native features into the mobile application codebase.

• Elevate Development Practice.

You will champion the improvement of mobile development workflows, lead code reviews, mentor junior and mid‑level engineers, and raise the bar for engineering excellence across the team.

• And recognise yourself here
• Experienced: You have 5-8+ years of hands‑on experience in native mobile development within a fast‑paced, high‑scale product environment.
• Mobile and Growth Mindset. You have expert‑level proficiency in native mobile development and are eager to apply architectural thinking as a versatile full‑stack contributor.
• You are deeply experienced in native Android development (Kotlin) and modern Android architecture.
• You have experience with, or a strong ability to rapidly master and guide, our i OS application and Kotlin Multiplatform Mobile (KMM) integrations.
• You are an expert at designing robust API interactions, optimizing system data flows, and handling complex asynchronous operations.
• Python knowledge is a strong bonus and an asset for contributing to our internal systems.
• Autonomous & Driven: You are capable of managing complex technical roadmaps, prioritizing effectively, and driving implementation independently while providing technical leadership to the team.
• Pragmatic: You focus on delivering reliable, maintainable solutions and know when to leverage existing technology versus advocating for new paradigms.
• Strong Collaborator: You communicate technical challenges clearly to both technical and non‑technical stakeholders and drive effective technical documentation.
• Bonus points
• Production AI: Familiarity with concepts like prompt engineering.
• Mobile Dev

Ops: Hands‑on experience improving CI/CD pipelines, automated testing, and build/release processes for mobile apps.

• Event‑Driven Systems: Experience working with asynchronous patterns and message queues (like Kafka or SQS/SNS) for reliable data exchange with mobile clients.
• Legacy Migration: Experience contributing to the modernization or refactoring of existing application codebases.
• A passion for climate tech. You're motivated by our mission to decarbonize homes and are excited to apply your skills to a problem that matters.
• What we have to offer
• In this role, you can expect an attractive compensation package starting from €70.000
• Join a team of Product Managers, Software Engineers, Designers, Data and Salesforce people who are excellent in their craft and are happy to share their knowledge and help you grow alongside them
• Our team is using the latest frameworks and is working with a modern tech stack to build powerful products for our customers, craftspeople, and internal teams
• Boost your skills with a dedicated annual learning budget to spend on conferences, courses or books
• Choose your own AI coding companion – we provide you with the license for the AI model or assistant of your choice
• We offer a challenge with purpose - the better our tech, the more people will live climate‑neutral and the better the world becomes for future generations
• We offer a fantastic culture in the tech team and beyond
• Modern office in the heart of Berlin
• Work from home - up to 3 days a week
• You receive an Urban Sports Club membership & nilo. health membership
• You can lease a job bike or bring your dog one day/week
• Corporate Benefits at more than 100 partners
• 20% employer contribution to your pension and disability insurance
• Über uns

About us

Every application is welcome here - regardless of gender, nationality, ethnic and social background, religion, ideology, disability, age, sexual orientation or identity.

We are convinced that everyone is valuable and deserves a fair chance.

Software has always been part of thermondo's DNA.

We have been the first to digitize trade a decade ago.

Today, our proprietary software enables 800 thermondinos to scale the heating transition in Germany.

But we want more.

We want to enable fully digitized and smooth customer journey ensuring that all processes are coming together: commercial funnel, procurement, product, supply chain, project management, finance, dispatch, HR planning as well as customer facing offerings for maintenance and home energy management.

Our product & tech teams in Xberg - the heart of Berlin - are a highly diverse and multicultural bunch.

They make sure that we can make a difference and scale the energy transition in Germany and work closely together with all departments.

Join our product & tech teams and pave the way for climate neutral living.

• Dein Bewerbungsprozess
• Your application process
• An initial interview with your Talent Acquisition partner, Alex
• If we are both on the positive side, you will talk to our Head of Engineering, Stas
• After this stage, you will undergo some technical assessments
• Then, you will have the opportunity to meet with your to-be teammates.

• Finally, Become a thermondino!

• Before inviting you to an initial interview, we use an AI-supported tool that helps our recruiting team with the initial screening and provides additional insights into the requirements of the respective position.

The decision on how to proceed with your application is always made by our recruiters and the responsible hiring managers.

• The specific salary level is determined during the recruitment process and depends on your experience, qualifications, and the scope of responsibility associated with the position.
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