Senior/Lead Backend Developer
Selection Lab
40 uur
Amsterdam
Senior
€5.500 – €7.500
Functieomschrijving
Design code architecture for reliability, performance, and security. Ship APIs/features that integrate cleanly with our Svelte frontend and external systems; use AI where it multiplies speed and quality.
More examples:
- Deliver/refactor a core API/feature with clear planning & docs
- Improve perf/stability (caching, queues, requests)
- Set habits: code quality, observability, communication, optimisation
Functie-eisen
Backend: Python (Flask, FastAPI, WebSockets, Celery)
Data/infra: Postgres, Redis, Docker, Heroku, AWS (S3, Cloudfront, Dynamodb, etc.)
Frontend: TypeScript, Svelte
(Dev) Tools: GitHub (CI/CD), typed code, tests (a lot), pytest, Ruff, Linear, Notion, Slack
(Dev) AI Tools: Copilot, Claude code, Langfuse
That said, we're always looking for ways to improve and optimize! Not just ourselves, but also our tooling.
What you'll bring
- Scale‑up ambition: bias for action, clear planning & communication, and end‑to‑end ownership.
- T‑shaped: primarily backend, but you can jump into our TypeScript/Svelte frontend to unblock teammates, know your way around infra, etc.
- Team-first: be able to help and learn something to others, review PRs, elevate (best) engineering practices and vision across a team
- Ability to challenge and refine architectural choices together with the CTO.
- 5–10 years backend experience in an ambitious environment. Preferably in Python and/or a high-level language (Go, Elixir, Rust, etc.).
- Strong API/code design, automated testing, and observability habits
- Security mindset & data privacy awareness
Nice to have: experience with: Flask/FastAPI, background workers/queues, Postgres, Redis, perf profiling, analytics, internationalization
Aanbod
- Salary €5,500–€7,500 (depending on experience) + 8% holiday pay
- Options to Stock Appreciation Rights (SAR)
- Office in central Amsterdam
- MacBook Pro
- Personal budget to improve your workplace to your likings
- Additional budget for books, coaching, or your way to learn and grow
- Team lunches, regular team outings, boot camps, champagne.
- Expense reimbursement for opening a pension account at Brand New Day
- 25 vacation days + 2 extra public holidays
- CO₂ compensation via tree‑planting initiatives
Over het bedrijf
We’re a product-first, fast-scaling HR tech company "Automating the selection process from careers page to first live interview".
Our goal: make hiring radically more efficient and objective. We ship fast, learn from real usage, and iterate fast.
- Fast-growing SaaS → impact measured in days, not quarters (or worse)
- A great Dev team (7) → real ownership and a direct line to decisions
- Data‑informed & user‑obsessed → ship → measure → iterate
- High bar, low ego → crisp feedback, privacy‑by‑default
This is the work environment: an outcome‑driven team. High bar, low ego. We share knowledge proactively, give crisp feedback, and make decisions fast. Continuous demos, lightweight RFCs, and blameless post‑mortems keep us learning. We work office-first from our lovely office in central Amsterdam. We deliver extraordinary results. We learn fast, together. We show we care.
A Typical Day at The Selection Lab
- Start by syncing in Linear and checking open PRs.
- Deep work on APIs, performance, or robustness.
- Lunch with the team (Friday roti is a tradition).
- Reviews & pairing to keep code clean and quality high.
- In-depth session to sketch (long term) architecture for a new feature together with the CTO
- More focus time to push a feature, explore a new approach or help a teammate out.
- Growth: 1:1s, learning, or short tech spikes.
- Wrap up your way (boot camp, drink, or one last PR).
Informeren en solliciteren
We'd love to hear from you! Also if you feel you don't meet 100% of the criteria but are very enthusiastic about the role.
Our aim is to ensure everyone has a fair and bias-free chance. That’s why we’ll ask a variety of questions in the most objective manner (rather than inviting you for a coffee right away - although we do love coffee ☕️).
Please take a moment to answer the questions in our application form. This will help us both to determine if there could be a good fit between us.
If your answers indicate a great fit, we'll definitely get in touch with you!
Interesse?
Solliciteer nu!
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