[Hiring] Freelance Data Engineer @JUNI gGmbH

Role Description

Your mission is to build the layer that connects our systems to one database, in both directions, and help us get the model right as we go.

• The shape of the data is mostly decided, and each new system will test it.
• Working out discrepancies about what counts as one person and when something happened.
• Knowing when the model has to change to accommodate a source.
• Making a case for a particular design, not only building what's specified.

Qualifications

• Integration against third-party APIs and webhooks, at depth: pagination, retries, signature verification, rate limits, undocumented payload shapes, late and out-of-order events.
• Bidirectional sync between systems that both think they own a field: loop prevention, echo suppression, an explicit answer to who wins on conflict.
• Postgres as an application database, not just a destination.
• plpgsql functions, triggers, constraints, and RLS used to enforce rules at the write path.
• Idempotency as a habit rather than an afterthought.
• Git discipline — migrations, PRs, review.
• Working with personal data under GDPR, and understanding why that constrains what gets ingested at all.
• Written English. Most of the work is async, and what you build has to be legible to someone who wasn't there.

Requirements

• n8n or another orchestrator.
• Supabase.
• Relevance work on a search index — Elasticsearch, OpenSearch, Meilisearch or similar; cluster operations are not the part we need.
• Experience as the only person on a system.
• German language skills.

Benefits

• Remote and mostly async work environment, with real conversations, especially early on.
• Freelance engagement, starting as soon as possible.
• Initial contract of three months, with potential for extension.
• Location: Berlin or remote within the EU.