Senior Software Engineer

Here's to a world without language barriers, with candidates with skills as varied as their stories.

Job details

  • Full-time
  • map markerLisbon, PT
  • cardRequires Work Permit
    Requires that you're a citizen or have a valid work permit / visa sponsorship to work in the country in which this position is based.
  • routeSenior
  • routeRequired language: English
  • Back-end Developer
  • tagMust Have: Machine Learning, PythonOther Required: Artificial Intelligence, C++, NLP

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Unbabel’s “Translation as a Service” platform allows modern enterprises to understand and be understood by their customers in dozens of languages.

Powered by AI and refined by a global community of tens of thousands of human linguists, Unbabel delivers professional-grade content at the scale required by modern enterprises like Facebook, Microsoft, Under Armour, Pinterest and Expedia.

Backed by Scale Venture Partners, Notion, Microsoft Ventures, Salesforce Ventures, Samsung NEXT and Y Combinator, Unbabel is accelerating the shift to a world without language barriers.
We are a diverse team, working every day to build an outstanding organizational culture, based on strong values of transparency, team spirit and continuous learning, with a fast-paced Silicon Valley atmosphere in the beautiful city of Lisbon, Portugal.

To strengthen the Applied AI team, we are looking for a senior developer with machine learning and natural language processing (NLP) experience to build, scale and maintain artificial intelligence (AI) services at Unbabel.  You'll be working closely with AI researchers, software engineers, product managers, and data analysts in developing truly disruptive NLP products that are changing the way translation is done. The Applied AI team is responsible for the productization of the core AI platform and exploration of the new opportunities in NLP and AI.

  • Design, plan, implement, test and analyze mission-critical production code in Python and C++
  • Profile, monitor and maintain AI tools and  services
  • Implement approaches and ideas to help address challenging problems in translation/localization domain
  • Design algorithms that combine human & machine workers to train high quality ML models.
  • Optimization of existing AI services, infrastructure and technical resources
  • Support critical applications in production
  • Build reusable tools to aid in rapid iteration and development.
  • Help develop and maintain a data and computing infrastructure.
  • Have a lot of fun hanging out with and being a part of the Unbabel team! 

Main requirements

  • MS degree in Computer Science, Machine Learning or Artificial Intelligence major is preferred
  • Solid foundation in Natural Language Processing
  • Minimum of 5 years full-time hands-on software engineering experience
  • Minimum of 2 years in developing and promoting machine learning methods and best practices in production environment
  • Hands-on experience with various deep machine-learning techniques and toolkits
  • Strong proficiency in Python and C++
  • Experience with agile software development
  • Fluent English
  • Strong verbal and written communication skills 

Nice to have

  • Knowledge of MT toolkits (Marian, OpenNMT and the like) and NLP libraries and tools (NLTK, SpaCy, CoreNLP) will be a big plus


  • Competitive salary at one of Europe’s leading tech startups
  • Stimulating startup environment committed to diversity and inclusion
  • Individual budget for training and conferences
  • Individual budget to setup your workstation(mechanical keyboard, mouse, etc.)
  • Stock options
  • Health Insurance
  • MacBook and external monitor
  • Yearly company retreat
  • Healthy food(fruit, dairy & snacks) in the office
  • Free language courses
  • Surf trips every Thursday morning before work
  • Team lunch every Tuesday
  • Drinks and snacks every Friday 

Apply now

Sign up to apply

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