Mobile Engineer (f/m/d)

thermondo; Berlin; Hybrid; EUR 50,000 - 70,000; Full time

Benefits offered by this job

Modern office in Berlin

Work from home – up to 3 days a week

Urban Sports Club membership

20% employer contribution to pension

Job bike leasing

Job summary

thermondo in Berlin is seeking a Mobile Developer to enhance our native Android/iOS applications. You will develop, test, and maintain mobile features using Kotlin, while collaborating closely with backend teams. Ideal candidates have 3-5 years of experience in mobile development and a strong willingness to grow into a versatile contributor. Benefits include modern office space, flexible work options, and a commitment to climate-positive initiatives.

Qualifications

• 3-5 years experience in native mobile development, preferably in a fast-paced product environment.
• Proficient in Android development (Kotlin) and eager to contribute to iOS application.
• Self-driven with effective task prioritization.
• Strong communication skills for team collaboration.

Responsibilities

• Develop high-quality features for Android/iOS applications.
• Implement technical designs focusing on performance and stability.
• Collaborate with backend teams for reliable integration.
• Take ownership of features from definition to deployment.
• Support AI integration and improve mobile development workflows.

Skills

Native mobile development

Kotlin

API interactions

Python

CI/CD pipelines

Event-driven systems

Job description

Overview

At thermondo, our mission is to decarbonize every home, and technology is our primary lever for change. We are disrupting a massive industry bogged down by legacy systems and manual work. We build intelligent software and automation that gives us a decisive edge, allowing us to operate at a scale and efficiency our competitors can’t match.

Responsibilities

• Develop Native Mobile Features. You will develop, test, and maintain high-quality features for our native Android/iOS applications (Kotlin Multiplatform Mobile), focusing on efficient UI implementation, state management, and robust data integration.
• Contribute to Mobile Architecture. You will implement technical designs, focusing on best practices for performance tuning, offline/online capabilities, and stability in our mobile applications.
• Collaborate on Integration. You will collaborate closely with backend and platform teams to ensure reliable integration of mobile features.
• Take Ownership of Tasks. You will take ownership of assigned features and tasks from definition to deployment, translating requirements into technical implementation plans.
• Support AI Implementation. You will implement and support patterns for integrating pre-defined LLM services and AI-native features into the mobile application codebase.
• Improve Development Practice. You will contribute to the improvement of mobile development workflows, participate in code reviews, and share knowledge within the engineering team.

Qualifications

• Experienced: You have 3-5 years of hands‑on experience in native mobile development, preferably within a fast‑paced product environment.
• Mobile and Growth Mindset. You are proficient in native mobile development and eager to grow into a versatile full‑stack contributor.
  • You are proficient in native Android development (Kotlin) and modern Android architecture.
  • You have experience with or a strong willingness to learn and contribute to our future iOS application.
  • You are comfortable reasoning about API interactions and system data flows.
  • Python knowledge is a strong bonus and an asset for contributing to our internal systems.
• Self‑Driven: You are capable of managing your tasks and prioritizing effectively, seeking guidance when necessary but driving implementation independently.
• Pragmatic: You focus on delivering reliable, maintainable solutions and know when to use existing technology versus learning new tools.
• Strong Collaborator: You communicate technical challenges clearly within the team and contribute effectively to technical documentation.

Bonus points

• Production AI: Familiarity with concepts like prompt engineering.
• Mobile DevOps: 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

• 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.
• 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.
  • You can bring your dog one day a week.
  • Work from home – up to 3 days a week.
  • You can lease a job bike.
  • You receive an Urban Sports Club membership.
  • Corporate benefits at more than 100 partners.
  • nilo.health membership.
  • 20% employer contribution to your pension and disability insurance.

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 a 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.