Senior iOS Developer

ELSA Corp.
Helps people speak English fluently and confidently using state-of-the-art AI technology

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ELSA (English Language Speech Assistant) Corp. is a San Francisco-based startup with engineering offices in Lisbon, Portugal. Our vision is to enable everyone to speak foreign languages with full confidence, reaching better life and career opportunities. Our flagship product, ELSA speak, is a personal mobile coach who improves our users' English pronunciation and intonation using phoneme and suprasegmental analysis of the user's speech signal. Our backend servers implement state-of-the-art speech recognition technology to pinpoint errors and give accurate and consistent feedback to our users on how to improve.

We are looking for an awesome iOS programmer that align with ELSA’s mission to help every language learner speak English fluently and confidently.

As part of ELSA’s team, you will build high-quality features for English learners in over 100 countries around the world. Your role will influence the future of the ELSA product vision and help the iOS team stay on cutting edge technologies.

At ELSA, solving a problem includes working with a team (back-end, speech scientists, product managers, designers) to design solutions that would impact hundreds of thousands of users. We are an agile team. We are passionate engineers. We are highly collaborative. We value results. We go above and beyond to help our users and to deliver superb products, but we also value work-life balance - we are motorcycle riders, mountain climbers, food-enthusiasts, espresso lovers, yoga students, proud parents.

Join our world-class team and be one of the personalities that make the ELSA culture awesome.

What will you do:

  • Design and implement new features for iOS, in Swift
  • Think holistically about the performance of the app and find ways to improve reliability and scalability
  • Mentor junior iOS engineers and share best practices you’ve learned
  • Continue to learn and tackle new technical challenges

Main requirements

  • 5+ years in Mobile App Development
  • Expert knowledge of iOS platform (Swift preferable)
  • Strong experience with iOS testing, from automated testing to unit tests for controller logic
  • References to past mobile apps you’ve built

Nice to have

  • Contribution to F/OSS projects


  • Competitive salary according to seniority
  • Company laptop
  • Flexible working hours
  • Ample room to grow professionally
  • Pure American startup experience
  • Office in a very centric part of Lisbon

Apply now

Sign up to apply

Or sign up to refer and earn a reward of €300