Senior Backend Developer

15 hours ago

Århus, Århus Kommune, Denmark WasteHero Full time 60,000 - 140,000 per year

Apply here

Important:

When applying,
please select the option "Aarhus – Senior Backend"
in the application form to ensure your application is routed to the correct team.

About WasteHero

At WasteHero, we're revolutionizing municipal waste management through cutting-edge software. Our cloud-native SaaS platform helps cities and private operators optimize routes, automate billing, ensure compliance, and build greener communities.

We're already working with municipalities and waste companies across Europe — including one of the largest public-sector transformation programs in the region — and we're just getting started.

WasteHero is a mission-driven scaleup with strong product-market fit, backed by institutional investors and public contracts. Our headquarters are in
Aarhus, Denmark
, where Product and Engineering sit at the heart of the business.

The Role: Senior Backend Developer

We're looking for a senior backend engineer to join our Aarhus engineering team and help deliver mission-critical features over the coming 12–18 months.

As a
Senior Backend Developer
, you will:

  • Build and maintain
    Python/Django + FastAPI
    services powering our SaaS ERP platform
  • Design and implement scalable
    REST & GraphQL APIs
    for integrations with municipal ERP systems
  • Develop
    ETL pipelines and migration scripts (Python/SQL)
    to ingest and transform complex datasets
  • Ensure system reliability, security, and
    GDPR/NIS2 compliance
    through structured logging, rollback strategies, and robust error handling
  • Collaborate daily with colleagues across Denmark, Finland, the UK, and Germany in an agile delivery setup
  • Contribute to architectural decisions around performance, scalability, and long-term maintainability

Our Tech Stack

  • Python 3, Django, FastAPI
  • PostgreSQL, Redis, Celery
  • GraphQL (Graphene), REST APIs
  • Docker, gunicorn
  • Bitbucket Pipelines (CI/CD)
  • Hosted on
    Hetzner
    with private networking & load balancing

You Bring

  • 5+ years
    of backend development experience (
    Python/Django preferred
    )
  • Strong experience with relational databases (
    PostgreSQL/SQL
    )
  • A track record of delivering production-grade APIs and backend services at scale
  • Experience with
    ETL
    , data migrations, or integration-heavy environments
  • Familiarity with
    Docker, CI/CD
    , and modern development pipelines
  • Excellent communication skills in English
  • Bonus: FastAPI, GraphQL, SaaS product background, or public-sector software experience

Why Join WasteHero?

  • High-impact role:
    Your work directly supports public-sector digitalisation across Europe
  • Ownership:
    Solve complex, integration-heavy backend challenges with real autonomy
  • Growth:
    Join a fast-scaling European SaaS company with ARR-driven expansion in the Nordics
  • Upside:
    Competitive salary + stock options
  • Culture:
    International, mission-driven team with a focus on clarity, fairness, and execution
  • Purpose:
    Real-world environmental impact at scale

Location

This role is based at our
Aarhus HQ
, with hybrid flexibility and opportunities to collaborate closely with our engineering hubs in Cairo, Finland, the UK, and Germany.

Important:

When applying,
please select the option "Aarhus – Senior Backend"
in the application form to ensure your application is routed to the correct team.

Apply here

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