Senior Software Engineer (Python) – Build Scalable AI Platforms

Build the backend of a fast-growing VC-backed SaaS platform. As a Python Backend Developer, you’ll design scalable APIs, integrate LLM workflows, and power real-time infrastructure — all in a lean, product-focused engineering team.

Bedrijfsprofiel

Our client is a VC-backed SaaS scale-up based in the Netherlands. Their platform combines AI, automation, and workflow orchestration to support smarter decision-making across Europe.

The tech team is compact and works fully in-house, with full ownership over architecture and product direction. The engineering culture is fast, pragmatic and collaborative. Work setup is hybrid: typically 2 days per week in-office (Randstad region).

Job Description

• Build and maintain scalable backends using Python (FastAPI or Flask)

• Design APIs that power AI workflows and modular decision logic

• Work with Redis and WebSockets to support real-time features

• Improve testing, performance, and system security

• Collaborate with product, frontend and fellow engineers

• Contribute to architecture, deployment pipelines and monitoring

Job Requirements

• 5+ years of backend experience, preferably 3+ in a SaaS or product environment

• Proficient in Python and familiar with modern API frameworks (FastAPI, Flask)

• Hands-on experience with Redis, Docker, GitHub Actions or equivalent tools

• Exposure to LLMs or AI integrations (or interest in working with them)

• Broad technical knowledge across architecture, CI/CD, security and testing

• Fluent in English; Dutch is a plus

• Must be living in the Netherlands with valid EU work authorization

Terms of Employment

• Monthly salary: €5500 – €9000 gross + 8% holiday allowance

• Equity via stock plan

• MacBook Pro and home office setup budget

• 25 vacation days + 2 additional personal days

• Hybrid work model (office-first with flexibility)

• Daily team lunch, internal bootcamps and knowledge sharing

• Long-term role with clear growth opportunities (e.g. Lead Engineer)

Important

We can only consider candidates who currently live in the Netherlands and hold a valid EU work permit. No visa sponsorship or relocation support available.

Want to apply or explore first?

Email d.gontha@haystackpeople.nl or message us for a confidential conversation.

Keywords:

Python, Backend, FastAPI, Flask, Redis, WebSockets, Docker, GitHub, SaaS, Engineering, APIs, Automation, Realtime Systems, CI/CD, Product Development, €100K+