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Senior Full-Stack Engineer - Mobile (m/f/d) Vienna, Austria

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Founded in 2012, wikifolio.com is a dynamic and rapidly growing FinTech in Vienna and the best-known company for B2C investments in German-speaking countries.

We believe that everybody should be able to invest successfully in the capital markets – regardless of whether you have €100 or €100,000 to invest. We stand for the democratisation of the investment market and put our users at the centre of our focus.

As our Senior Full-Stack Engineer - Mobile, you will play a key role in building and evolving our mobile applications and their supporting backend services. You will work within the App Team alongside the Team Lead and cross-functional partners to deliver robust, scalable, and secure solutions for our customers.

This role focuses on developing high-quality mobile experiences using React Native while also designing and implementing backend services using NestJS, tailored to the needs of mobile clients. You will contribute to architectural decisions, drive technical quality, and support production systems in a fintech environment where reliability and performance are critical.

Responsibilities

  • Lead the development of mobile application features for iOS and Android using React Native.

  • Design, implement, and maintain backend services using NestJS, exposing REST and/or GraphQL APIs for mobile clients.

  • Collaborate closely with the Team Lead, Product Management, Design, and Backend teams to align on requirements and technical solutions.

  • Take ownership of end-to-end feature delivery across mobile client and backend layers.

  • Ensure high standards of code quality through code reviews, refactoring, and adherence to best practices.

  • Improve application performance, stability, and scalability on both client and backend sides.

  • Implement and maintain testing strategies across mobile and backend components.

  • Contribute to and improve CI/CD pipelines for mobile and backend services.

  • Participate in on-call rotations, production support, and incident response.

  • Identify and proactively address technical debt and architectural challenges.

  • Stay up to date with React Native, NestJS, and full-stack development best practices.

Requirements

  • Senior-level experience in mobile application development.

  • 5+ years of experience with React Native.

  • 2–3+ years of backend development experience using Node.js frameworks, preferably NestJS.

  • Strong proficiency in TypeScript and JavaScript.

  • Experience building and consuming REST APIs; GraphQL experience is a plus.

  • Solid understanding of iOS and Android platform-specific considerations.

  • Experience with state management and performance optimization in mobile applications.

  • Working knowledge of Docker for development and deployment.

  • Experience with CI/CD pipelines for mobile and backend applications.

  • Familiarity with authentication and authorization concepts; experience with OAuth and JWT is a strong plus.

  • Proficiency with Git and modern version control workflows.

  • Willingness to participate in on-call duties, production support, and incident response.

  • An interest in financial markets is required.

  • Strong verbal and written communication skills in English.

It's a plus if you have

  • Experience with PostgreSQL and ORMs such as TypeORM.

  • Cloud experience on AWS, Azure, or GCP.

  • Knowledge of mobile security best practices.

  • Experience with mobile and backend testing frameworks.

  • Exposure to performance profiling and monitoring tools.

Technical challenges you will work on

  • Delivering complex features across mobile and backend layers with a consistent and high-quality user experience.

  • Improving performance and reliability of mobile applications and backend services.

  • Maintaining consistent behavior across iOS and Android platforms.

  • Ensuring high test coverage and safe deployments.

  • Implementing robust error handling, monitoring, and logging in production systems.

What you can expect

At wikifolio.com an exciting job environment awaits you in a dynamic, constantly growing and multiple award-winning fintech. Experimenting, failing early, learning and continuing is our motto. An innovative working world with opportunities for professional development is our goal. Expect real work-life balance as well. Become part of our team – we live by our values transparency, fairness, ambition, sustainability and joy and make investing available for everyone.

The minimum monthly salary for this position is €4,350 gross, in accordance with the IT-collective agreement, however the salary we offer will be adjusted in line with the successful candidate’s qualifications and experience.

Apply now