Backend Engineer
At team.blue · Bratislava-Slovakia; Bratislava, Slovakia; Belgrade-Serbia; Baar, Switzerland; Budapest-Hungary; Budapest, Hungary; Madr…
- Engineering
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- Posted
- 22 September 2026
- First seen by us
- 15 October 2026
- Last checked
- 3 hours ago
Job description
From team.blue’s job post, as they wrote it.
6,000+ Customers. 300+ Integrations. Your Code Moves the Data.
At Windsor.ai, we connect data from 300+ sources (Facebook Ads, Google Ads, GA4, HubSpot, Salesforce, TikTok) to 30+ destinations (Looker Studio, BigQuery, Snowflake, and LLMs like ChatGPT and Claude). We're a lean, highly technical remote team serving 6,000+ customers, and we're looking for a Backend Engineer to help scale the platform behind it.
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The Role
You'll build and maintain the Python pipelines at the core of our marketing data integration and ELT platform: pulling data from third-party APIs, normalizing it, and delivering it reliably at scale.
* Own API integrations end to end: rate limits, pagination, custom authentication, and inconsistent error handling across hundreds of sources.
* Ship production-grade code: clean, tested Python with pytest coverage and code review as routine.
* Keep pipelines fast and reliable: concurrency, caching, and smart data modeling as volume grows.
* Work async with a small, senior team: engineers, product, and support. Basic SQL is expected of everyone.
Stack: Python (Flask, multi-threading), pytest / pytest-xdist, pylint, PostgreSQL, Redis, Linux, Docker, GitLab CI/CD, Taiga.
Who You Are
* 4+ years of professional programming experience with strong production-grade Python
* Solid grasp of OOP, concurrency (threads/async), and data structures
* Comfortable in Linux development and production environments
* Experience integrating third-party APIs and dealing with their quirks
* Independent, async, and comfortable in a fully remote, contractor-style engagement
Bonus: ETL/ELT or data integration experience · marketing/ad-tech APIs · PostgreSQL and Redis in production · Docker and GitLab CI/CD
The Offer
* Competitive Pay / Contractor role
* Fully remote
* Real impact: your code runs in production for 6,000+ customers
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