Senior Back-end Engineer

On-site, partially remote or full-remote from EU 

65/100k€ (depending on exp) + benefits

We consider diversity to be a true asset and are happy to learn more about all candidates! EU visa (or citizenship) is required


Job description
Your key missions :

Integrated within a collaborative development's team, you will help us deliver our product:

  • Work on high scalability low latency (10ms) real-time bidder
  • Work on high data volumes and extract data intelligence for easy access, with low latency. Use data to measure performance and improved targeting (data augmentors)
  • Provide back-end features for our SaaS product (user management, payments, application metrology)
  • Deliver in a fast-paced environment using edge infrastructure (CI/CD, Cloud-native technologies around Kubernetes, GitOps workflow, AWS environment). 
    • We like to empower developers to be autonomous from development to production
  • Take active part to continuously improve our code quality, metrology, alerting
  • Depending on your experience, mentor junior back-end engineer(s)


Who are you
  • You are rigorous, autonomous, result-oriented, and have strong organizational skills
  • You have a first experience on cloud platforms (ideally AWS)
  • You have hands-on experience developing services, in a service-oriented architecture (SOA) or micro-services
  • You are fully proficient in a back-end language: Golang or Python. Ideally, you can develop in both
  • You have experience in database engines (SQL & NoSQL) & Data models
  • Ideally, you have knowledge of network protocols


  • A sane work environment built on trust, delivery, and mentoring
  • Attractive salary and remote-friendly
  • Dedicated conferences and training budget
  • Central Paris office
  • Fully equipped workstation
  • Restaurant Tickets (Swile)
  • Health Insurance (Alan)
  • Gym subscription (Gymlib)
  • Regular team-building events
  • Annual company retreat
  • Partnership with childcare centers


Interview Process


  • Phone screening
  • In-depth tech interview
  • Culture Fit meeting
  • Founder(s) / VP meeting
  • Decision and offer


About KMTX
Our mission

We are KMTX, a fast-growing AdTech company building the Ad Platform of the Open Web. We are working to provide the main advertising platform of the Open Web making it simple for anyone to run effective campaigns online. We believe this is the only way of preserving and improving the state of the Internet by making it open and fair. We’re targeting a $200B market.

The problem we’re working on

As of today, Open Web advertising is a mess with unnecessary complexity, opacity, low respect of user privacy and poor performances for advertisers as well as publishers. This is what allows Walled Gardens (Google, Facebook, …) to dominate the online advertising market as they provide simple & efficient advertising platforms. A simple & efficient ad platform is necessary to value the Open Web, promote free access to information and fight the duopoly.

Our solution and achievements

Since 2017, we’ve worked on the hardest part of creating the ad platform of the Open Web. An automated set of tools and technologies to buy advertising in real time while delivering strong performances for advertisers.

We’ve proved that our approach works with over 200 brands on more than 1500 campaigns and managed to consistently beat every advertising platform on the market. This success helped KMTX grow very quickly to an 8 figures revenue.

We are now building and deploying a self-served platform that aims to be “the Facebook Ads of the Open Web”. It allows advertisers to launch campaigns in less than 5 minutes on any inventory (Web, Apps, TV, ...) and deliver strong results for their brand. Simple & Efficient. This platform will be available for advertisers in Europe and North America.

Before you apply, please check if any restrictions apply in terms of time zone or country.

This job has a geo-restriction in place:  EU only.


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Category Software Development
Job type Full-time
Hiring from EU only
Date Posted 1wk ago

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