Junior/Mid Backend Engineer - Performance

Vibe; Paris; Hybride; EUR 60 000 - 80 000; Plein temps

Résumé du poste

A leading ad technology firm in Paris seeks a Backend Engineer to develop high-performance backend services for real-time bidding and performance optimisation. This role is suited for those with 2+ years of experience in backend engineering, preferably using languages like Go or Python. Candidates should have a strong interest in real-time systems and the ability to work in an in-office setting initially for effective mentoring. Competitive compensation and remote options are offered.

Prestations

Very competitive compensation including stock options

Generally remote-first work model

Health insurance

Meal vouchers

Two annual offsites

Guaranteed childcare placement

Qualifications

• 2+ years of experience as a Backend Engineer on production systems.
• Comfortable working with at least one backend language (Go or Python).
• Interest in real-time systems, performance, and data-intensive workloads.

Responsabilités

• Design and implement backend services for bidding and performance optimisation.
• Work on distributed systems focusing on latency and reliability.
• Participate in code reviews and design sessions.

Connaissances

Backend engineering

Real-time systems performance

Familiarity with Go or Python

Curiosity and eagerness to learn

Fluency in English

Outils

Rust

Go

Python

AWS

Kubernetes

Description du poste

Vibe at a glance

The Vibe team is a passionate, competitive bunch focused on one thing: allowing any marketer, any brand, of any size, to advertise on TV in under 5 minutes.

We think fast, act fast, grow fast so advertisers can safely and precisely reach TV audiences, the largest digital audience in the US.

Vibe achieved profitability just 18 months post-launch, growing revenue by 30+% every quarter since 2022, and we’re already well on our way to reaching our 2025 goal of becoming the #1 TV Ad Platform.

Join us!

Your Team

You will join our Performance team, a cross‑functional group working at the intersection of backend engineering, data science and machine learning.

This team builds and operates the systems that decide how budgets are spent, how bids are placed, and how performance is optimised in real time. These components are central to Vibe’s performance and growth.

You will work closely with Vincent Lagabbe, Backend Engineer, who brings deep experience in large-scale, performance‑critical systems from companies such as Criteo and Alan.

The team values strong engineering fundamentals, thoughtful system design and continuous learning, with a modern, pragmatic and state‑of‑the‑art approach to technology.
This position would be in an in‑office first setting, at least for the first year, for proper mentoring purposes.

Your Mission

You will contribute to the development of high‑performance backend services powering our real‑time bidding and performance optimisation systems.

This role is designed for a junior to mid‑level backend engineer who already has solid production experience and wants to level up quickly by working on complex systems, alongside experienced engineers.

What you will do

• Backend engineering

  • Design and implement backend services involved in bidding, budget pacing and performance optimisation

  • Write clean, maintainable and well‑tested code used in production at scale

  • Gradually take ownership of backend components as your experience grows

• Real‑time systems & performance

  • Work on distributed systems with strong latency and reliability constraints

  • Learn how to reason about performance, scalability and trade‑offs in real‑world RTB systems

  • Participate in analysing and improving critical paths in production services

• Modern engineering practices

  • Use AI‑assisted development tools (including Claude at Vibe) as part of your daily engineering workflow

  • Leverage AI to improve code quality, debugging, system understanding and learning speed

  • Continuously refine your engineering practices using modern tools and methodologies

• Learning, mentoring & collaboration

  • Work closely with backend engineers, data scientists and ML engineers

  • Benefit from hands‑on technical mentoring on architecture, performance and best practices

  • Participate in code reviews, technical discussions and design sessions

  • Grow in an environment that values clarity, pragmatism and engineering excellence

• Our tech stack: We are technology‑agnostic and believe in using the right tool for the job.

• Backend languages: Rust, Go, Python

• Infrastructure (AWS): Kubernetes, Redis, Athena, Spark…

What we’re looking for

• 2+ years of experience as a Backend Engineer on production systems

• Comfortable working with at least one backend language (Go or Python) and willing to learn others

• Comfortable working in an in‑office first setting, at least for the first year, for proper mentoring purposes

• Curious, eager to learn from experienced engineers in a state‑of‑the‑art technical environment

• Interest in real‑time systems, performance and data‑intensive workloads

• Appetite for using AI tools to learn faster and improve daily engineering work

• Strong fluency in English - as more than half the company is US‑based and some team members only operate in English

• Collaborative, humble and impact‑driven mindset

Why this role

• Learn from experienced engineers with deep expertise in large‑scale, performance‑critical systems

• Work on core systems directly impacting Vibe’s performance and revenue

• Exposure to state‑of‑the‑art technologies, tools and engineering practices

• Strong growth curve in a technically demanding but supportive team

• A real opportunity to build long‑term backend expertise in adtech and real‑time systems

Benefits

• Very competitive compensation (salary and stock‑options / BSPCE)

• Generally Remote‑first (in France or elsewhere), with the option to work on‑site in an ultra‑cozy coworking space in the heart of Paris (Morning Laffitte)

• Tech Syncs: worlwide Engineering and Product teams meet in person at least once per quarter

• Health insurance (Alan)

• Meal vouchers (Swile)

• Two annual offsites

• Guaranteed childcare placement