Senior Fullstack Engineer – Growth R&D

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.

How we work

We’re a hybrid team – remote when it makes sense, onsite when it matters most.

Once per quarter, your whole team spends 5 working days together at our Wrocław office – a time for focused execution, unblocking work, and driving key outcomes.

Our office is open year-round – drop by anytime.

Benefits

We don’t want you to worry about all the basic benefits - like a Multisport card, private health care, or a home office equipment budget.

What we really want you to feel and what we believe in is that the real benefits come from the culture we’ve built.

With a hybrid work model, unlimited paid days off and sick days policy, an environment focused on outcomes instead of worked hours, and people dedicated to their work, you’ll find a workplace where you can thrive.

And here’s the icing on the cake: you’ll have the opportunity to work with the makers behind all Text products: LiveChat, ChatBot, HelpDesk, KnowledgeBase, OpenWidget.

Are you feeling like this might be a great place to consider working for? We feel it too ;) Join us and apply.