We’re looking for a product-minded Fullstack Developer 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 development

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

Additional Information

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.

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Senior Fullstack Developer

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