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Backend Developer in Madrid


36,000 - €48,000
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Job Description

Company Description

We are a data analytics company located in the center of Madrid. We are developing a data science software that allows our clients to analyze complex problems and find actionable insights.

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Our customers use Graphext to do many things, such as Market Research, People Analytics and Customer Segmentation. Graphext is a horizontal tool to manage, enrich and analyze data, and we continue to discover new customer use cases.

We are currently a team of 14 people, with a mix of half business and half product. We are a young dynamic team with 3 different nationalities. In the engineering team, we strive to come up with simple solutions to complex problems. And if the challenge requires it, we do not skimp on efforts to investigate new technologies or algorithms that allow us to create the best data analysis tool in the market.

Role Description

We are looking for an experienced backend engineer. This person will be working mainly with all the engineering team but specially with the CTO improving and developing many parts of our engines. For example, we have an in-house orchestrator of machines for batch processing, it is build in Ruby and likely one of the first tasks would be to optimize it, e.g., launch tasks that use the same docker images all in one machine so we can save the time of download the same image more than once.

We are also building a new engine to speed up the computation of filters and derived data in the client. It is built in C++, then we compile it into WebAssembly and distribute it as a Typescript library so the frontend can use it and be snappy even with large datasets. Here you will be in charge of extending the core adding more data transformations or data structures to support other kind of datasets like time series.

There are other pending tasks such as building a type system for our small scripting language, the one in which the users describe the data processing scripts. Another example would be to extend our own WebGL visualization library. As you see this position will play a key role in the development of our main product, coding robust solutions to challenging problems. That is why we are looking for previous experience with C++ as well as having knowledge of algorithms and data structures.


The ideal candidate will have previous experience as backend developer, someone who likes to work as a team and teach their colleagues, who enjoys some autonomy to investigate and propose improvements in the product. If you have worked in data processing, coding video games logic or optimizing C++ code, we want to work with you.
In order to land a bit the role, we are looking for:
  • Solid understanding of data structures and algorithms.
  • Previous working experience coding in C++.
  • Knowledge of Ruby is valued but not required.
  • Solid understanding of the full web technology stack (e.g. HTTP, cookies, headers, asset loading / caching).
  • Disciplined approach to testing and quality assurance.
  • Competence in English, we usually speak in Spanish but it is not uncommon to write or have conversations in English.
We value degrees in computer science or similar studies because we know the background they provide, but we also know that a degree does not guarantee anything, so we do not consider official degrees as a requirement.

We currently have our office at (5 minutes from the Atocha train station in Madrid, Spain). It is a very nice co-working that is housed in a historic building, la real fábrica de tapices. The atmosphere is very cozy, especially when the weather is nice work or eat in the gardens is a delightful time.

We do not have strict working hours, we let everyone decide their times, there are people who decide to get up early and leave at 3:30 p.m. and others who are more nocturnal and start the day much later. We do not offer the possibility of working completely on remote, because in the office happens too many things that we are not able to transmit via chat, we have already tried it. What is not a problem is to work remotely one or two days a week once a good working dynamic has been achieved.

We have a culture of responsibility, where everyone is responsible for identifying and solving product failures. We are proud of what we do. The rhythm of a typical day is intense, and we keep the number of meetings to the minimum. Rarely you will see us doing extra hours, if one day we spent more hours another day we made up for it. We understand that we are in a long-term project and nobody should be burned out.

The salary range we can offer for this position is 36K to 48K with negotiable shares.


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