Growth-Focused Full-Stack Engineer: Ship a Self-Serve B2B

firsty.app; Amsterdam; On-site; EUR 39,000 - 84,000; Full time

Job summary

Firsty.app in Amsterdam is seeking a growth-focused full-stack engineer who owns the product end-to-end. You will ship features for the developer portal, SDKs and docs, enabling partners to go live with minimal friction, while using AI tooling to accelerate delivery.

You will instrument funnels, analyze activation and retention, and own the surface from design to measurement. Experience across the stack and comfort shipping solo are essential.

Qualifications

• Ship fast with full-stack ownership and minimal guidance.
• Experience building developer portals, docs, and SDKs.
• Ability to instrument funnels and drive activation and retention.

Responsibilities

• Own builders.firsty.app and the developer portal and docs.
• Ship features to reduce friction for partners with speed and quality.
• Instrument funnels, analyze drop-offs and drive improvements.
• Own the developer experience end-to-end from design to measure.

Skills

React

Node.js

Go

AI tooling

Tools

Claude Code

SDKs

Job description

Firsty.app in Amsterdam is seeking a growth-focused full-stack engineer who owns the product end-to-end. You will ship features for the developer portal, SDKs and docs, enabling partners to go live with minimal friction, while using AI tooling to accelerate delivery.

You will instrument funnels, analyze activation and retention, and own the surface from design to measurement. Experience across the stack and comfort shipping solo are essential.