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(Senior) Backend Engineer Python 80-100% (all genders)

Permanent employee, Full or part-time · DE - Berlin
Job-Summary
At Lionstep, we are redefining talent identification and recruitment with cutting-edge technology. To strengthen our global Product & IT team, we are looking for a passionate and experienced (Senior) Backend Engineer Python 80-100% (all genders). In this role, you will develop and optimize high-performance, scalable APIs using FastAPI, support the transition from our legacy Flask API, and take ownership of maintaining and expanding our Google Cloud Platform (GCP) infrastructure. You will also work on asynchronous workflows, database architectures, and automation to enhance our platform. If you are an ambitious backend engineer with expertise in modern backend technologies, cloud environments, and workflow automation, we would love to hear from you! Join us from May 2025 or by agreement and become part of our journey to revolutionize the way companies connect with top talent.

Start of work
1. May 2025 or by agreement
Your mission
  • You design and develop RESTful(-ish) APIs with Python (FastAPI) and implement best practices in terms of performance and security.
  • You maintain and extend our existing legacy API based on Flask, ensure feature parity with the new API and work towards a long-term replacement.
  • You are responsible for the maintenance and expansion of our cloud infrastructure on Google Cloud Platform (GCP), including Cloud Run, Cloud SQL and Cloud Storage.
  • You implement and optimise asynchronous workflows (e.g. with Celery and asyncio) to process large amounts of data efficiently.
  • You design database architectures (Google Datastore, PostgreSQL) and take care of migration processes (e.g. Alembic) and caching mechanisms (Redis).
  • You will actively participate in code reviews and help shape our development processes (CI/CD, testing).
  • You will work closely with our operations team to automate talent workflows and continuously improve our platform.
  • You will ensure that your projects are clearly documented so that the team can access all relevant information at all times.


Your profile
  • You have sound experience in the development of backend applications with Python (3.9+) and are confident in using at least one modern framework (preferably FastAPI; experience with Flask is a plus).
  • You have a basic understanding of Google Cloud Platform (GCP) and have ideally already gained experience with Cloud Run, Cloud SQL or Datastore.
  • You have experience with relational databases (e.g. PostgreSQL) and are ideally familiar with SQLAlchemy and Alembic.
  • You are enthusiastic about automation, data processing and asynchronous workflows on a large scale.
  • You are open to new technologies (e.g. AI & LLM, Elasticsearch, RAG), have the willingness to learn and familiarise yourself quickly with new topics and can also imagine working with R for legacy components.
  • You take responsibility for your projects, act proactively and always keep an eye on the goals.
  • You communicate openly and clearly, work in a structured manner and can explain complex technical topics in an understandable way.
  • English: B2 – upper intermediate
Team
The Lionstep team currently consists of around 60 employees. We are an internationally active company, with employees working in Switzerland, Germany, the USA, Spain, Portugal, Serbia and Romania. The sense of togetherness among the entire Lionstep team is unbeatable and unique. We regularly exchange ideas across teams and value new, innovative ideas.

Report to: Mathias Gruschwitz (Head of Engineering)
Colleagues: 7 people
Team language: German & English
Values

Transparency

We walk the talk! We cultivate trusting relationships by being open and honest in the way that we share and receive information - up, down and across our organisation.

People first

We care about people! We unleash the collective potential of our clients and teams by understanding individual needs and enabling talents and lions to thrive.

Ambition

We don't settle! We turn our vision into reality and push the boundaries every day through curiosity, courage and the passion to develop ourselves and others.
Benefits
Benefits
Gross salary
Approx. EUR 70'000 - 80'000/year (depending on relevant work experience)
Contact Persons
David Boll (Head of People & Culture) - david@lionstep.com

No applications will be accepted by e-mail.
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About us
Lionstep helps companies to identify, find and hire new employees with a unique combination of artificial intelligence and human interaction. We already support over 700 international companies in their search for new employees. We only work directly on behalf of a client, providing them with important insights into what is happening in the market, advising them and providing transparent, informed feedback according to our CELS model. In addition, our candidates appreciate the new approach to the recruiting process, which is reflected in our Google Reviews.                          
                    
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