Full-Stack Engineer

Why TheirStack?

At TheirStack, we're building one of the world's best data products on top of worldwide jobs and company data. Hundreds of people sign up for our product every day, and we're just getting started. You'll help us 10x that number.

Small team, big impact: We're a team of 3, yet tens of thousands of users rely on us every month. Sales and marketing teams at companies like Grafana, TigerData or Confluent use our data directly, and salestech companies like Clay, Reo.dev or Genesy integrate it so that all their users can access it too. Your work will have impact from day one, and the features you build will be seen and used by thousands of people every day.
Bootstrapped and profitable: We don't have to 50x the money of any investor to succeed. Success means solving challenging problems, helping our customers and growing the business while living a full, balanced life, no 996 needed to do our life's work.
Speed is key: everything boils down to it. The product needs to be fast and efficient, and we need to ship fast and often as well.

Why now?

As of speaking, our yearly revenue is 4x what it was by the same time one year ago. To keep up with the growth, in the last few months we have been investing heavily in improving the product and make it fast and resilient.

To name a few, now all our job and company searches run on ClickHouse and are up to 10x faster than before. API credits to get jobs are 3x cheaper. We added an affiliate program that gives users a 30% commission. We added lots of new filters to our API and UI. Jobs now include structured locations, searchable in a catalog, and jobs are also filterable by them.

Now, it's time to invest again in growth and marketing.

Why will you do?

We know lots of things that could help us grow more - we just don't have the hands and time to do them yet. Your work here will be critical and you'll have a massive impact helping us build them. These are examples of things you'll help us do:

Create new pages in our landing page, which will expose more parts of our datasets programatically. These pages will match searches that potential customers are doing on search engines and LLMs, and will bring us more users.
Build AI agents that understand the needs of every person that signs up, checks their usage of our product, and reaches out to them with tips on how to get the most value out of TheirStack.
Let users have multiple workspaces, with different API keys in each workspace. Now a user can join other workspaces, but a user can only be in one workspace at a time, and the API key is linked to a user, rather than a workspace.
Build new features in our product, such as new filters, improving the UI/UX, create an onboarding flow so that users from each segment arrive to the "aha moment" faster, tec.
Build infrastructure that lets us analyze massive amounts of data from new sources such as Common Crawl to detect more technologies, intents and pains companies have and that our users could leverage.
Identify ways to add new keywords and technologies to our catalog automatically based on our data, without having to do it manually.
Build tools to monitor how our biggest customers are using our API, detect if their usage is going up or down, and send us alerts if the risk of churn is increasing.
Add natural language filters to our API with function calling + build evals for it, so that our users can use English to query our jobs and companies datasets.

You will be a good fit if you...

You have a strong product mindset. You have an opinion on what makes a good product, know that good is better than perfect, like to put yourself in the shoes of the users and can build things end-to-end by yourself
You've built and maintained production-ready systems in the past.
You are a curious person, who loves to learn new things. You're not afraid to wear many hats.
You’re familiar with testing, and value code quality and maintainability.
You are a team player, like teaching what you know and helping others grow as well.
You don’t have to be managed and can think of the right tradeoffs to be made to find the right technical solutions given the business context.
You don’t need to be fluent in English, but should be able to read and write in English, as most of our customers are international.

Bonus points if...

You've worked with big amounts of data in the past. You have an intuition on what could work and what would probably fail. You have optimized queries in the past and don't dread doing it.
You have some basic knowledge on SEO. If not, don't worry - you'll learn quite a lot here.
You're familiar with our tech stack. We use FastAPI for the API, React for the web app, Next.js for our landing page, PostgreSQL to store users data, ClickHouse for heavy searches, Redis for caching, and we deploy the frontend on Vercel and the backend on Render.

The team

As the second employee at TheirStack, you'll work closely with the founders, helping to shape the company's future:

Xoel Lopez: Previously at Zara.com, Narrativa, and Tinybird, Xoel specializes in data and web scraping. He kickstarted TheirStack by developing the MVP and building the core data infrastructure, the scrapers and the API, from the ground up.
Christian Palou: Previously at Manomano.com and Zara.com, Christian focuses on UX, front-end and backend development at TheirStack. Before TheirStack, he launched TrainerStudio.io, a SaaS for personal trainers that was acquired last year.
Pablo Durán: Previously at Fever, Sngular. Pablo specializes in full stack development (data, backend, frontend, devops, etc). He joined TheirStack in June 2024.

One 30-min chat with us to get to know you, tell you a bit more about us and the position.
A 30-min chat to learn more about your soft skills and your technical experience.
A take-home test to spend 3-4h on. You can use AI on it, we care more about how you think and what production-ready means for you.
Another 30-min short call to discuss the test.

How to apply

Even if you don’t tick all boxes but still think this is an interesting position, are excited about the challenges we have and think you can help us make the pie larger, apply.

The best is yet to come. Let's talk!

Apply through this link