Backend Developer (PHP Symfony)

Sparteo is an independent suite of AI-powered advertising technologies built on sustainable, sovereign infrastructure.

Since 2018, we’ve been reshaping programmatic advertising to make it faster, more transparent, and more profitable by building the most direct path between publishers and advertisers.
But we don't stop here: wherever attention lives, on the web, in apps, on CTV, and beyond, our mission is to monetize audiences, across every device. Our data-driven tech delivers 30% higher revenues for our clients on average than traditional solutions.

Our Solutions:

→ Actirise: the display tech designed for performance
→ FastCMP: the consent management platform specifically designed for business purposes
→ Meetscale: the most advanced SSP for Publishers and Ad Networks
→ Viously: the ultimate all-in-one video tech solution
→ Voxeus: the audio distribution and monetization technology

Behind Sparteo’s growth is a team of 100+ talents across 11 countries, united by a shared ambition to redefine the future of digital advertising.

Our dedication has placed Sparteo among the most dynamic tech players in Europe:

• FT1000 ranking – Among the fastest-growing European companies in 2024 & 2025
• The Europas – Featured in the list of 100 hottest startups
• Pixalate Ranking – #1 Web SSP in France with our Actirise solution, overtaking Google AdExchange

These milestones are just the result. What truly sets us apart is how we work: at Sparteo, we don’t settle, we act.

• We are hungry: Always pushing for better, never settling for average.
• We are data-obsessed: Facts guide us, not assumptions, not egos.
• We think as one: Collective goals come before personal wins.
• We trade off: We simplify, prioritize, and go for high-impact results.
• We solve problems: We own challenges and turn ideas into action.
• We say what we do: Radical transparency is how we grow, no fluff, no hiding

Discover our journey, products, and culture on 👉 our website 👈

Your Job

Join our team to build the core of our systems and applications. Your code will have a direct impact on the services that power our platform as it constantly evolves towards a shared microservices architecture. We are looking for a pragmatic individual who enjoys shipping robust, functional code and understands that best practices are refined through iteration.

To specify

• Architect, develop, and maintain high-performing APIs using PHP and Symfony.
• Enhance and optimise API performance for reliability and speed.
• Implement and uphold security best practices in API development.
• Write clean, maintainable, and well-documented code to ensure longevity and scalability.
• Collaborate with cross-functional teams to deliver quality solutions.

Your profile for this job

• 5+ years in PHP development, with 3+ years focused on building APIs.
• Expertise in RESTful API design and principles.
• Proficiency with version control systems (preferably Git) and experience in CI/CD workflows.
• Hands-on experience with microservices architecture and containerisation (e.g., Docker).
• Knowledge of unit testing and test-driven development.
• You are comfortable using AI-assisted development tools (e.g., GitHub Copilot, Tabnine).

Bonus Skills:

• Familiarity with message queuing systems (RabbitMQ, Apache Kafka).
• Experience designing APIs for analytics or statistical data.
• Strong understanding of database optimisation and query performance tuning.
• Knowledge of adtech or online advertising industries.

Your mind set to share our adventure

• You want to make an impact and move things forward collectively. Does hearing phrases like "Yes, but we've been doing it this way for years..." make your hair stand on end? We feel the same way: progress is made by questioning what already exists.

• You solve problems pragmatically and analytically.

• You're looking for a fast-moving environment where your agility will be an asset. The 80-20 (Pareto) principle holds no secrets for you.

• Your ability to listen encourages you to challenge and improve yourself on an ongoing basis.

Our working conditions

• A convivial and flexible working environment, with our telecommuting culture integrated into the company's organization.

• A friendly and small-sized team that you can find in our offices near Lille or in Paris.

• Social gatherings and company events organized throughout the year.

• Sparteo is experiencing significant growth both in terms of business and workforce, especially internationally.

• Additional benefits include an advantageous compensation system with non-taxable and non-mandatory overtime hours, as well as a Swile restaurant ticket card.

Ready to join Team Sparteo? Send us your CV and continue the recruitment process!

Here are the stages in our recruitment process

• Discussions about your driving forces, your ambitions and our Sparteo mindset

• Analytical and business logic tests

• Discussions with one or more members of the Sparteo team, including your future manager

• Taking up references

Our recruitment process is mainly conducted by videoconference; however, certain stages may require a face-to-face meeting.