Founding Full Stack Engineer

Location: Berlin, Germany 🇩🇪 / Remote, Europe 🌍

We're looking for a Founding Full Stack Engineer to build core features across our stack, integrate with ad platforms APIs, and create AI-powered workflows. You'll work directly with the founders, own systems end-to-end, get early employee equity, and help build both the product and company from day one.

About Spiral 🌀

Spiral is an AI growth engine that helps mobile advertisers scale profitably with paid ads.

In the future, ads won’t be static media slots. They’ll be dynamic experiences. Spiral is the creative performance layer for the future of paid advertising. Built on top of major ad platforms and with performance data as foundation, we turn creative generation and ad automation into one system.

We launched in September 2025. Since then, we’ve onboarded multiple major mobile apps in Europe and helped them scale Meta Ads with static creatives. Marketing teams use Spiral to research competitors, analyze creatives, and launch top-performing AI ads.

Team

• As for now, the team consists only of 2 co-founders. We are looking to hire first 3-4 team members in early 2026.

• Sasha, CEO, has 7 years in mobile apps, ex-growth at at The Coach, Prisma Labs, ivi and Joom. ex-CMO at Vocal Image (AI Communication Coach app), grew ARR from $0.7M to $9M in 2 years by profitably scaling paid ads.

• Filip, CTO, has a master's in Artificial Intelligence from the University of Amsterdam. ex-AI Tech Lead at Nodestar, 8 years of experience building for both mobile games and B2B SaaS.
  

Who we are looking for

• You are a jack-of-all-trades technical wizard who have a proven track record of building applications end-to-end at high velocity. Backend, frontend, infrastructure — you can work across the entire stack and take ownership of features from conception to deployment. You get excited about shipping real products that people use every day.

• You want to see results of your work in days, not months, and iterate on user feedback. You've incorporated AI into your own workflow and are excited about building agent-ready systems that maximize velocity without compromising quality.

• You're naturally curious and self-sufficient. And you want to be early, with real ownership over the product and the team as the company scales.

Requirements

• Very comfortable with React, NextJS, Python.

• You've built and launched full-stack projects from scratch.

• High autonomy, you can ship solutions without hand-holding.

• Startup experience is preferred, but not necessary.

• Fluent in English.

What the job looks like

• Design, ideation and implementation of both front and backend features.

• Integration with major ad platform APIs (Meta, Google, Pinterest, Snapchat).

• Setting up and configuring dev tools, writing automations and managing AI agents.

• Building agentic workflows with LangGraph.

• Maintaining repositories clean and agent-ready.

• Identify the highest impact areas and focus your time there.

Location

We are open to remote candidates in Europe. Berlin based candidates, or candidates who are open to relocating, are preferred.

We believe working together in the office helps build trust, leads to sharper discussions and faster decisions, and creates a culture that is hard to replicate remotely. It is also more fun.

What we offer

• Salary.

• Early employee equity.

• Compliant employment, visa support.

• Growth opportunities as the company scales.
  

Hiring proccess

• 1. Apply Apply via LinkedIn or send an email to sharing an interesting way you use AI to improve your workflow, and include your portfolio and/or github.

• 2. Intro Call (30 min) Chat with Filip, our CTO. Learn more about the role, discuss your experience, and share what motivates you.

• 3. Technical Task Complete an open-ended challenge that shows how you approach problems and ship solutions. This reflects the kind of work you'd actually do here.

• 4. Founder Meeting Spend a day with Sasha and Filip. Get your questions answered and get a feel for the team you'd be joining.

• 5. Offer If it's a mutual fit, we'll make you an offer.