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Mobile Reverse Engineer

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To us, personal finance is not about calculations and formulas but about lives being lived, emotions and money habits. The same goes for programming - it is not about the tools. The best results come from passion, dedication and intelligence - and natural curiosity.

We've been building a very successful personal finance platform, Spiir, for the last 8 years. Lately, we have carved out some of the main technologies of Spiir and turned them into B2B solutions, allowing companies to build innovative solutions on top of data from Nordic banks. We call this solution Nordic API Gateway.        

Nordic API Gateway revolves around providing others access to bank data. When we started up, no public APIs were available in the industry. Thanks to the Connections team, we’ve created access for our customers to more than 350 banks. The team successfully re-implemented more than a handful of industry-wide heavily hardened blackbox security frameworks along with numerous device binding solutions. We have extensive monitoring capabilities and we always strive to be a step ahead of any roadblocks.              

The connections team is filled with genius minds, stubbornness, geeks, kindness and Alexes ( 40% of the team members are named Alex). The team is lead by Christian Panton; PhD in Geophysics, ethical hacker and data activist. His efforts in fighting for responsible use of data on citizens resulted in him winning Data Protection Price 2019 (Databeskyttelsesprisen). If you want to learn from the best in the field - learn from him. 

The Connections team has been super successful. Now, we don’t just want to be ahead of the curve, we want to surf it! 🌊

As a Mobile Reverse Engineer, your main tasks will be to stay on top of the operational load by reversing updates to banks with a focus on automation. You will also reverse engineer apps and security frameworks, both as part of specific projects and for maintaining operation capacities. If you want a glimpse into what these tasks will look like, check out our Android Puzzle https://play.google.com/store/...

Along with using state of the art security analysis frameworks, we’ve our own reverse engineering tooling. You will be a key player in making it better and maintaining it. You will also get to play around with new security frameworks to understand our risk landscape, eg. what can cause our operational capacities to fail.

We expect you to:

  • See yourself as a hacker and love technical and mathematical puzzles
  • Be motivated by challenges - you hardly ever give up 
  • Know at least two of the following languages: C#/.NET, Java, Javascript and Python
  • Have basic knowledge of cryptography and common encoding methods
  • ADB and APK sound familiar to you
  • Be able to perform an HTTP request from netcat
  • Knowledge of the internals of Linux and Android phones
  • You are not afraid of assembly - not even ARM
  • Be open-minded, willing to learn new skills, hardworking and passionate


  • You like to participate in CTF-competitions
  • You know who Frida is
  • You are not afraid to do math (modulo large primes) and know the dangers of textbook RSA implementations
  • You can’t wait to solve our CTF-challenge and find as many flags as possible - Spiir Android Puzzle

Send your application, CV, LinkedIn, list of previous coding projects and preferably a link to Github or other code repository to us. In case you have any questions, do not hesitate to contact our Recruitment Hacker & HR Manager, Steinunn (stg@spiir.dk).                   

ddf271a9-9ab9-46b7-a0f8-dd2aca376416  (a little something something that should be helpful in the challenge😏)

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Wilders Pl. 15A
1403 København Directions stg@spiir.dk

Why Spiir?

At Spiir you’re not only a part of a vibrant workplace. As a part of our team, you’ll join a FinTech family who’s dedicated to help others managing their personal finance in a smart and simple way. 

or FunTech? There is plenty of space to innovate, laugh and have fun in our offices.

  • A strong team spirit

    Despite being a mixed bunch of talents with a wide range of skills and expertise, Spiir has an awesome team mentality. We love working in teams, being social and celebrate our successes together. 🎉🥂

  • A fast-moving FinTech

    Too early for champagne? Nope! 🍾 We currently have more than 280.000 Spiir users in Denmark and we’re just about to expand our services to the rest of the Nordics. We strive to reach 750.000 app users in 2019 and we aim to become the leading PSD2 infrastructure in Europe with Nordic API Gateway.

  • A low-key and relaxed workplace

    From passionate developers to digital strategists, there is room for everyone at Spiir. We’ve created an informal workplace where diversity, humor and endless high-fives are a natural part of the everyday office life.

  • Flexible working hours

    Morning person or not? We don’t care. At Spiir you’ll get the freedom to structure your working hours as you please.

    Who doesn’t like to work from home once in a while? 😎

Who are we?

We’re a dedicated, talented and energized team. We’re all passionate about Spiir, and it’s our core believe that personal finance should be less boring and more fun.

With the mission to create a strong PSD2 infrastructure platform, we’ve also launched Nordic API Gateway, which is set to make innovation easier for everyone. Nordic API Gateway helps fintech companies and start-ups create awesome services for both consumers and businesses.  

Already working at Spiir & Nordic API Gateway?

Let’s recruit together and find your next colleague.

  • Ahmed Magdy
  • Alex Langberg Jensen
  • Alex Voigt Hansen
  • Bjørn Eyde
  • Christian Dias Løgberg
  • Christian Panton
  • Christian Pihl Nielsen
  • Christian Victor Andersen
  • Christie Holm Kristensen
  • Dobrawa Radecka

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