Senior Fullstack Engineer
Wrocław
Growth R&D – Growth /
Full time /
Hybrid
About the Role
We’re looking for a product-minded Fullstack Engineer to join our Growth R&D team. This is a high-impact engineering role focused on building web-based tools, experiments, and internal automations that power scalable user acquisition and engagement strategies.
You’ll work side-by-side with our Head of Growth to create, test, and iterate on product-led growth initiatives — from standalone tools (like Typing Speed Test or AI Email Generator) to data-driven content engines, automation frameworks, and internal growth infrastructure.
The ideal candidate is comfortable working across the stack (React + Node.js/Fastify), thrives in fast-paced, experimental environments, and is excited about building things that go live quickly and are seen by millions of users.
This is not a feature factory — we build things that grow.
Responsibilities
- Build and scale fast, high-performance web applications and microtools
- Design and implement backend APIs and data pipelines using Node.js and Fastify
- Integrate third-party APIs and external data sources to power new products
- Maintain and evolve existing tools and platforms with a focus on performance and SEO
- Participate in growth experiments, prototyping, and rapid iteration cycles
- Ensure code quality, scalability, and maintainability across projects
- Own the end-to-end delivery — from concept to deployment
What We’re Looking For
- 5+ years of experience building production-grade fullstack applications
- Solid knowledge of modern JavaScript (ES6+), React, and Node.js
- Experience with backend development (REST APIs, Fastify, or Express, async workflows)
- A product-focused mindset: you care about impact, not just code
- Experience with rapid prototyping and iterative engineering
- Strong understanding of web performance, SEO fundamentals, and data flow
- Ability to work autonomously and iterate quickly based on feedback and metrics
- Bonus: experience working on tools, automations, or SEO-driven platforms
This role is perfect for a builder — a creative engineer who loves turning raw ideas into polished, working products. If you enjoy hacking on fast-moving projects and solving real-world problems through code, let’s talk.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
