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Christophe Valentin

Senior Backend Engineer

Can work in or around Paris

  • 48.8915
  • 2.3184
Propose a project The project will begin once you accept Christophe's quote.
Propose a project The project will begin once you accept Christophe's quote.

Location and workplace preferences

Paris, France
Can work onsite in your office in
  • around Paris 17e Arrondissement and 10km


Project length
  • ≤ 1 week
  • ≤ 1 month
  • Between 1-3 months
  • Between 3-6 months
  • ≥ 6 months
Business sector
Would prefer to avoid:
Social Networks
Company size
  • 1 person
  • 2-10 people
  • 11 - 49 people
  • 50 - 249 people
  • 250 - 999 people
+2 other


Freelancer code of conduct signed
Read the Malt code of conduct

Verified email



Skills (10)

  • Languages
  • Beginner Intermediate Advanced
  • Beginner Intermediate Advanced
  • Methodologies
  • Beginner Intermediate Advanced
    Henri Chabrand
  • Beginner Intermediate Advanced

Christophe in a few words

In the past 8 years, I have worked in several startups, ranging from pre-seed to scale-up. Lately, I worked at Aircall which I joined in 2017 and experienced the exciting scale from 50 to 400 employees. I have been faced with scaling challenges, both technical and organisational.

I would be glad to help you on pure development tasks, or share my learnings in terms of organization and tech leading.


Aircall - Aircall

Software Publishing

Backend Architect

Paris, France

July 2020 - Today (2 years and 10 months)

I joined the Architecture team to bring my historical knowledge of the stacks to more teams. As my first assignment, I elaborated a plan to extract from the monolith the call setup function that enables two participants to be connected. The proposed solution had to work alongside the legacy system and customers needed to be migrated smoothly without downtime. I joined my old team to help them kickstart the project in an AWS serverless environment. Once I had onboarded them and they were autonomous with the developments, I turned to my next project which was to be able to store a customer's assets in the region of their choice. This implied working deep into the Rails monolith, but also create a new service in an AWS serverless environment.

Aircall - Aircall

Software Publishing

Tech lead

Paris, France

November 2019 - July 2020 (8 months)

I took the technical leadership of the 4-engineer team. I was responsible for projects scoping, organizing the 2-week sprints and making sure the engineers could work efficiently. In coordination with the PM and EM, we regularly reviewed the processes and organization of the team to always try to improve. I was also the main point of contact for the other teams and needed to anticipate impacts of our developments on their projects.

Aircall - Aircall

Software Publishing

Backend engineer

Paris, France

November 2017 - November 2019 (2 years)

I first joined the team responsible for handling calls, which is the core business of the company. We were tasked with developing new features leveraging the Twilio Programmable Voice API. We had to work in an ever increasing traffic, handling loads of concurrent requests.
We worked on extracting important systems from the Rails monolith into pure Ruby microservices. To that end we adopted the Domain Driven Design methodology to shape the new services while respecting bounded contexts. We made sure that the legacy and new systems could work alongside and allow for a smooth transition.
Our services had to be performant and handle an ever increasing traffic.
Ruby twilio programmable voice Domain Driven Design Event-driven architecture MySQL SQL Scale-up Scalability

Appaloosa - Appaloosa

Software Publishing

Fullstack engineer

Paris, France

June 2014 - September 2017 (3 years and 2 months)

3 recommendations

Check out Christophe's recommendations