Job
- Level
- Senior
- Job Field
- Data, Back End
- Employment Type
- Full Time
- Contract Type
- Permanent employment
- Location
- Cologne
- Working Model
- Hybrid, Onsite
Job Summary
In this role, you will develop the entire data platform, from data ingestion through storage to querying, scaling and optimizing complex systems using Python, TypeScript, and PostgreSQL.
Job Technologies
Your role in the team
- We are building the world's decision infrastructure: the strategic twin of every industrial organization for complex combinatorial problems.
- Your mission: scale our data platform for multiple customers and domains.
- Customer data arrives in many formats from many sources, ERP exports included; it has to land in our system consistently, stay manageable at millions of records, and be fast to query when models and results are on screen.
- The product is a data-heavy web app with a math-heavy backend (Python, TypeScript, Solid.js, Postgres, on Cloudflare): your center of gravity is data and infrastructure, but you touch the whole stack.
- We are looking for a system thinker who wants to shape the architecture, and more than that.
- What you'll own: The data platform end to end: ingestion, storage, and the query paths that keep millions of records fast on screen.
- You design it, you build it, you run it in production.
- The platform layer, directly with the CTO: infrastructure, deployments, and the path to production for the whole team.
- Performance and correctness work in the optimization engine, together with our research engineers.
- Your features from first line to production: nobody hands you a ticket and waits.
- How we work: Small team, short lines of communication, no layers.
- You own your features end to end: you build them, you ship them to production yourself, you run them.
- Feedback runs both ways and it runs continuously, in daily work and in weekly one-on-ones.
- We talk as equals.
- We communicate proactively and flag it early when something isn't working out.
- Saying no is part of the job.
- We like this work, and you'll notice.
- The energy of a small team that cares is what people remember about being here.
- We review each other's code, and we like being together in the Cologne office, because the fastest conversations still happen in a room.
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Our expectations of you
Qualifications
- Strong Python and solid TypeScript, with the appetite to work in both daily.
- Production PostgreSQL (multi-tenant, migrations, performance).
- Data pipelines over heterogeneous sources (ERP exports, Excel, CSV) onto object storage (S3 or comparable), built to keep working as customers and formats grow.
- Distributed systems and API design: typical failure modes, HTTP/auth/caching, sane versioning and error behavior.
- Engineering craft: design patterns, CI/CD pipelines you set up yourself, prototypes you can throw away.
- You communicate proactively, rather than too little, and you organize yourself and your work.
- German at C1 or better, and fluent English.
- Team life runs in German; code and docs are English.
- NRW-based (Cologne office), optionally Munich, Stuttgart, Berlin area or else willing to work hybrid.
- Open to find a way if we fit.
- You are structured and biased for action, and you have shown you play to win wherever life has put you so far.
- This role is not for you if you want a clearly defined box, or work handed to you in tickets.
- We are a small team, pre-Series A: structures and processes are still being built, by us and by you.
- Priorities shift with customers, and some weeks a deadline bends the plan.
Experience
- 5+ years building production backend or data-intensive systems.
- Analytics-data experience: real SQL depth, plus any of Parquet/Arrow/DuckDB/dbt/warehouse internals.
- You have worked in a team, not mostly alone, and you know from experience which agile practices carry their weight.
- You have experience working with Linear, Jira, or a similar project management tool.
- Nice to have: a substantial migration you carried out end to end (system, stack, or data) · telemetry and observability · Cloudflare or comparable serverless infrastructure · frontend experience, ideally with Solid.js or another reactive framework · optimization/OR exposure · manufacturing or ERP data experience.
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What we offer
- Impact. You see your results in the real world, fast.
- The problems are concrete (production plans, capacities, logistics), and customers can measure in euros what your work changed.
- Ownership. What you build, you ship, and you own it once it runs.
- No layers between you and production, no approval chain that turns your decision into someone else's.
- The people next to you. You work directly with the CTO on the platform layer and with our research engineers on the optimization engine, and you build on eye level with the founders.
- Shaping. You shape how this team works, not just what it builds.
- The processes are still forming, and whoever shows up with a better way of doing things gets to install it.
- This is a place for system thinkers: the interesting part isn't writing the code, it's seeing how the pieces fit and where they'll break.
- The company is early; your scope will grow with it.
- Feedback speed. You will know directly what you are up to, we speak out loud, we adjust, we grow.
- High stakes. Competitive salary and relevant room in the equity package (VSOP) to match your contribution and your career development.
- The basics. Hardware of your choice · AI tooling budget · sports membership · Deutschland-Ticket.
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Topics You Will Work On
Job Locations
About Your Employer
Circonomit GmbH
Circonomit GmbH, a software company based in Aachen, was founded in 2022 and offers a Decision Intelligence platform specifically designed for industrial organizations. This solution connects corporate data with modeling and optimization processes to visualize complex operational relationships and support decision-making in value creation and supply chains.
Description
- Company Type
- Startup
- Working Model
- Hybrid, Onsite
- Industry
- Internet, IT, Telecommunication
Senior Software Engineer, Data
- Location
- Cologne
- Working Model
- Hybrid, Onsite
- Diversity
- Open for all genders
