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Urgent! Freelance Senior Backend Engineer Job Opening In Berlin – Now Hiring Go Mula GmbH

Freelance Senior Backend Engineer



Job description

Your mission

As a Senior Freelance Backend Engineer at mula, you will play a key role in strengthening our backend infrastructure while working flexibly on a part-time basis.

Our mission is to become the most digitally integrated B2B Merchandise Platform globally.

You’ll focus on impactful backend topics — from shop solutions to integrations — and help us implement advanced technological concepts that scale.

Your role

  • Collaborate with our Tech Unit, responsible for all digital and technical touchpoints.
  • Contribute to shaping our backend infrastructure and integration portfolio.
  • Act as an expert in APIs, plugins, automations, and integrations.
  • Provide your senior expertise to guide architectural and strategic decisions while enjoying the flexibility of a freelance setup.

Your tasks

  • Shape our backend architecture and introduce new components where needed.
    Maintain and extend backend services built in Python (Django).
  • Improve existing integrations and implement new automations (HR, CRM, and beyond).
  • Lead the development of client-facing APIs and keep documentation up to date.
    Work on diverse challenges: shop solutions, payment (Stripe), integrations, automations, plugins, SSO, Adobe automations, and both internal & public APIs.
  • Collaborate closely with product, design, and support teams to solve real-world business problems.
  • Accelerate us on our path toward a clean, fast, and reliable platform experience.
  • Share your knowledge with our team, mentoring where relevant, and contributing with a pragmatic, senior mindset.

Your profile

  • Based in Europe (CET) or able to work during European business hours
  • Senior-level experience (4+ years) with Python and Django.
  • Comfortable with lean and agile product development in fast-moving environments.
  • Solid knowledge of REST and SOAP API design.
  • Nice to have: exposure to serverless architectures, AWS services (Lambda, SQS, SNS, DynamoDB), or infrastructure-as-code (Terraform, CloudFormation).
  • Bonus if you’ve worked with: PostgreSQL, Redis, RabbitMQ, Kubernetes, AWS, EKS, Node.js, Next.js, JavaScript, React, Docker.
  • Strong communicator who documents well and shares knowledge openly.
  • Independent, reliable, and able to manage your own workload within part-time availability.
  • Fluent in English, both spoken and written.

Nice to have 

  • Broader experience with Django and other Python frameworks.
  • Knowledge of frontend technologies (React, ES6, JavaScript).
  • AWS certifications.
  • Cybersecurity awareness.

Why us?

  • Flexible part-time engagement tailored to your availability.
  • Contribute meaningfully without a full-time commitment.
  • Work remotely with a collaborative, international team.
  • Focus on impactful backend and integration projects where your expertise makes the difference.

About us

mula. is a fast-growing HR- and Tech Startup integrating and streamlining the design, purchase, storage and distribution of promotional goods in the most efficient way possible.

We are building a powerful digital platform with unique capabilities to revolutionise and emphasise the importance of employer branding.








Required Skill Profession

Computer Occupations



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