Senior Backend Engineer F/M

  • Paris
  • Full-Time
  • Start Date: 31 August 2021
  • Apply Now


Ipsos est le leader en France des études de marché et des enquêtes d’opinion. Groupe français indépendant, fondé en 1975, Ipsos opère aujourd’hui dans 90 pays et donne aux entreprises et aux institutions pour lesquelles il travaille, les clés de compréhension de la société, des marchés, des citoyens et des consommateurs.

Une mission qui s’appuie sur la disruption numérique, l’extension des domaines d’observations et l’innovation continue pour améliorer la finesse des analyses.

Intégrer Ipsos aujourd’hui c’est :

  • Choisir un métier passionnant au cœur des enjeux d’actualités et des transformations de la société.
  • Bénéficier d’une multiplicité d'opportunités d’apprentissage dans des secteurs différents : le marketing, la publicité, les médias, la politique, le CRM, qui intègrent les dernières innovations digitales et technologiques.
  • Se voir confier des responsabilités immédiatement sur des études avec de véritables perspectives d’évolutions professionnelles.
  • Evoluer au sein d’un groupe international dans lequel les opportunités de mobilité sont une réalité.

Pour répondre aux nouveaux besoins de ses clients, Ipsos dispose de plus de 75 services différents regroupés dans 17 Lignes de Services.

Cette nouvelle organisation nous permet d’aiguiser nos expertises pour apporter à nos clients des réponses précises à leurs questions, en nous permettant d’être plus spécialisés, rapides et homogènes sur tous les marchés.

Job Description

Our company

Synthesio, an Ipsos company, is a global leader in AI-enabled Consumer Intelligence. Our hybrid offering provides companies, brands, and agencies with the most complete, accurate, and predictive picture of their markets and buyers. Our AICI platform, powered by the most advanced natural language understanding and AI algorithms, supports the broadest set of online and offline data sources and fully leverages Ipsos’ award-winning analytical frameworks. Synthesio was founded in 2006 and has offices in New York, Paris, London, Singapore, and Brussels.

Our department

The Synthesio R&D department is focused on data provisioning, enrichment and exploitation.
We crawl 70M posts each day from a plethora of social networks and mainstream press websites. Each document is then analysed and enriched using custom NLP and image recognition models developed by our data scientists. All this data is stored in our databases (1 PB+ ElasticSearch, 750TB+ MySQL clusters, 50 TB+ ScyllaDB) and can be accessed by our customers via our dashboarding solution.

Our stack: Go, Python, NodeJS, MySQL, ElasticSearch, Cassandra (ScyllaDB), Kafka, Gitlab, Docker, Ansible.


  • Design, develop and deploy backend services inside a microservices architecture with focus on high availability, low latency and scalability.
  • Challenge our current architecture, design new systems with the team. Lead technical choices that will impact the whole codebase.
  • Improve our development workflow and our team practices.
  • Work with SRE team in case of major production issue, be able to dive in codebase and system to identity/resolve it faster

Preferred Experience

Technical skills

  • You have 5+ years of experience as a Backend developer.
  • You are fluent in Golang or another strongly typed language.
  • You are experienced in building data pipelines, and already have knowledge in some of these technologies or their equivalent: Apache Kafka, ElasticSearch, ScyllaDB.
  • You always want to improve the tools, frameworks, and are not afraid of refactoring when building a feature.

The job is for you if you are

  • Interested in building systems that handle massive data querying (1 PB+ ElasticSearch, 750TB+ MySQL clusters, 50 TB+ ScyllaDB…)
  • Interested in our stack: Go, Python, NodeJS, MySQL, ElasticSearch, Cassandra (ScyllaDB), Kafka, Gitlab, Docker, Ansible
  • Intellectual curiosity and passion to discuss consequences of a design choice, understanding user needs.
  • Passionate about technology, you look out for news about big data storage systems, REST APIs, CI/CD, and data tools of all kinds.
  • Able to explain complex systems, working on presentations for direct co-workers or vulgarization for people in other departments
  • Fluent in English and French. This includes written, speaking and reading


  • Choice between PC or Mac
  • Flat organization and strong culture
  • Remote friendly (partial or full remote is possible)
  • International and diverse environment (US, EMEA, APAC)
  • Competitive salary
  • Working in a growing company with talented people
  • Staff canteen
  • Healthcare insurance

Recruitment Process

  • A 30 minute screening phone call with the hiring Engineering Manager
  • A 60-90 minute interview with some engineers of the team. You’ll conduct a situational exercise (video call possible)
  • A 60 minute pair programming session with engineers of the team.
  • Optional meet & greet (30 minute each) with various members of the team (Product Managers, Frontend and Backend engineers,…) (video call possible)
  • Proposal

Additional Information

  • Contract Type: Full-Time
  • Start Date: 31 August 2021
  • Location: Paris, France (75013)
  • Experience: > 5 years
  • Possible full remote