Growth Engineer

Viktor; Warszawa; Remote; PLN 264,000 - 396,000; Full time

Job summary

Viktor is seeking an engineer who owns the numbers and can diagnose where users drop off from signup to first win. You will design experiments, ship fixes quickly, and drive activation across Slack and Teams.

You will run A/B tests, define metrics, and pair with a Growth Data Scientist to move activation and retention. This role embraces AI-driven tooling and end-to-end ownership, with work across web, desktop, and mobile as Viktor expands.

Qualifications

• You own the metrics and use data to guide growth decisions.
• You can define activated users from data and identify funnel leaks.
• You have shipped a product end-to-end with real users.

Responsibilities

• Identify where users stall from signup to first win and fix it yourself.
• Run experiments with clear hypotheses and measurable results.
• Own activation for Viktor across Slack and Teams; improve time-to-value.
• Make features discoverable with in-product prompts and better defaults.
• Instrument changes so every release has measurable impact.
• Collaborate with a Growth Data Scientist and ship quickly.

Skills

Growth

Activation

Experimentation

A/B testing

Data-driven

Engineering depth

Tools

TypeScript/React

Python

Modal

Job description

The Short Version

An engineer who owns the numbers. You find where people drop off between signup and their first real win with Viktor, design the experiment that fixes it, build it end to end and ship it the same week.

The Hard Part

Viktor lives where work already happens, in Slack and Teams, with web, desktop, and mobile apps on the way. People talk to him like a colleague, and the whole product is a conversation with an AI employee who writes code, runs it, and ships real work back.

We want people to hand Viktor the work they'd give a great hire, and earning that is as hard as making the thing work at all. Viktor acts on his own and sometimes gets it wrong, and your job is to make people trust him with their real work anyway.

Most growth playbooks assume a product people click through. Viktor is a conversation with an AI employee, so activation means a first task that goes well. The levers are onboarding conversations, defaults and nudges as much as screens.

What You'll Actually Do

• Find where users stall, from install to first win to team-wide use, and fix it yourself.

• Run experiments: a clear hypothesis, shipped behind a flag, a result you act on. You design measurement with our Growth Data Scientist.

• Own activation for Viktor in Slack and Viktor projects: first run, first task, time-to-value.

• Make features discoverable and move retention through in-product prompts, lifecycle nudges and better defaults.

• Own land-and-expand loops: invites, sharing, referrals.

• Instrument everything you ship so every change has a number behind it.

• Whatever needs building. Small team, large surface.

Who You Are

• Customer-first, and you get excited about what data and user feedback reveal about how to grow usage. Then you have the product intuition to ship the fix.

• You think in metrics. You can define an activated user from the data, take a metric apart, and say which funnel stage is leaking and why.

• You've moved activation, retention or conversion, and you can show the before-and-after.

• You run experiments: A/B tests with a clear hypothesis and a result you act on.

• You've shipped a real product that real people use, and you owned it end to end. A product with real users is the point, not a side project that never left localhost.

• Real engineering strength. You ship your own PRs, including ones that touch the database and user data, without anyone else gating them. Depth in your own area matters more than full-stack breadth.

• Detail oriented. Empty states, microcopy, edge cases: you notice, and you won't ship until it's right.

• You talk to users and own outcomes, not tickets. You shape the problem, cut scope when you should, and ship the thing that moves the metric.

• Speed, with the bar up. You ship today, not Thursday, and it's still good.

• Agentic coding is your daily workflow. You build with AI by default and you're faster because of it.

• Genuine drive. You build things because you can't not.

Why This Role Is Different

• No layers. You work directly with both founders, design, and growth, and decisions get made in the room, not in a Linear ticket.

• You own the surface customers actually see. Every win shows up in activation and retention the next week.

• We use Viktor to build Viktor. You ship the product using the product, every day.

• Real ownership: a surface of the company that customers depend on. When it wins, everyone knows whose work it was.

Even Better If

• You've founded something or been an early-stage builder.

• You've shipped something with real traction: users, revenue, downloads, a product people know.

• You've built growth loops (referrals, invites, lifecycle) in a PLG or B2B product.

• You've built with the AI tooling we live in and have opinions about it.

Tech

The product lives in Slack and Teams today, with web, desktop, and mobile apps on the way. TypeScript/React for the web, Python on the backend and agents, Modal for infrastructure. This role leans instrumentation and experimentation. You move across the stack, database included, when an experiment needs it.

How we work

Small team, high trust, low process. Decisions are made by owners, not committees. You will ship your first week. You will talk to users your first day.

We don't do alignment meetings or stakeholder syncs. We build things, see if they work, and iterate.

Why Viktor

We're one of the fastest-growing companies in the world. The product works. The market is pulling.

This is a rare window: everyone here owns a surface of the company that customers depend on. That doesn't last forever. Right now, it's still true.

Compensation

Top-of-the-market salary and the kind of ownership that only exists at this stage.

The best work happens when you're in the room. This role is Munich or Warsaw, or remote in Europe, and we bring the whole team together in person a few times a year.