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Back-End Engineer [Freelance]

Equativ · AdTech & MarTech · Paris

ParisEngineeringApril 30, 2026Read from Lever
FreelanceOn siteMid-level (3–5 yrs)

How fresh is this listing

Likely a ghost listingVerified on the publisher's site 5 hr. ago

Old or reposted several times: there is a fair chance this is a standing pipeline rather than a real opening. Ask the recruiter whether the role is budgeted.

  • Up for 138 d

Checked every six hours on the publisher's site. Age counts from the original posting date, even after a repost.

What the listing says

Build and query a multi-billion entry ID Graph, ingest massive data into high-performance key-value stores, and deliver low-latency targeting and reporting features.

  • 3–4 yrs experience
  • English required
  • Individual contributor

Read from the listing's text by a language model on September 14, 2026 — indicative, check the original listing.

Description

👫 About the team

At Equativ, we’re on a mission to develop advertising technologies that empower our customers to reach their digital business goals. This means that we rely on massively scalable, widely distributed, highly available, and efficient software systems; the platform deals with over 3 million requests per second (+250 billion/day) managed by 3,000 servers with less than 250ms response time.

Our innovation team based in Paris, Nantes, Bordeaux, Limoges, Krakow and Berlin is composed of 150+ straightforward and energetic engineers working in an Agile environment and ready to tackle the most complex technical challenges.

✏️ Your mission

You will join our Addressability team distributed in multiple locations. You will be onboarded in a multi expertise feature team of back-end developers and Data Engineers, with the mission to build and query a multi billion entry Id Graph, plug third party data providers and provide customers and business teams with advanced targeting and reporting features.

What you'll do ✏️

  • Ingestion of massive amounts of data high performance key value stores

  • Query user data millions of times per second with a response time of a few ms

  • Improvement of our graph by making it sharper, faster

  • Design trade offs (feature vs performance)

  • Business support on external partners' and customers

💪 About you

  • 3-4 years of seniority in high perf, low latency C# coding

  • Expertise of Aerospike or equivalent high performance KV store

  • Experience with Event streaming (Kafka), Go, PHP, Docker, Kubernetes, Cloud platforms (ideally GCP) is a big plus

  • Able to lead design discussions and mentor others

  • Customer oriented approach: you deliver clean and usable solutions for customers (and you know that customers hate bugs!)

  • Proficient in verbal and written English

  • Passion for writing high quality and maintainable code following Software Craftsmanship or Continuous Delivery

  • Entrepreneurial spirit and know-how to identify opportunities of improvement

  • Personal projects with code sharing, we’re curious about your art!

Tech stack detected

At a glance

Published on April 30, 2026 · first seen on September 6, 2026

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