Why Join Us?

At Semji, we’re deeply transforming how major brands create and optimize their content with our all-in-one Content Marketing platform. Our solution empowers companies to manage every step of their content strategy—from identifying visibility opportunities to precisely measuring performance and ROI.

On a daily basis, our technical challenges are numerous, often exciting, and sometimes highly ambitious:

• We aggregate large volumes of data in real time (web crawling, content extraction, data retrieval and storage from numerous third-party APIs).

• We develop truly innovative features powered by cutting-edge generative AI models from OpenAI and Anthropic.

• We consider UI/UX a real differentiator, with high-performance stakes.

• Our infrastructure is hosted on AWS, and we’re constantly working to industrialize it, optimize performance, and control costs (DevOps mindset).

• We’re data lovers—charts, metrics, and monitoring are our thing. Our stack is monitored at multiple levels with tools like Kibana, New Relic, and Metabase.

• More broadly, we tackle all the classic challenges of building and scaling a full SaaS application.

Today, over 400 companies in 15 countries rely on Semji every day, including iconic brands like Leroy Merlin, La Vie Claire, Macif, and Qonto.

👉 Feel free to create a free trial at https://app.semji.com and see it in action!

What Will Your Day-to-Day Look Like?

You’ll join a passionate and ambitious R&D team with a strong technical level—eager to welcome you and build great things together.

The team currently includes 12 people:

• David, Arnaud, Mouhamed, Manuel, Gaëlle, Abdel – Developers

• Ayyoub – Front-End Tech Lead

• Sébastien – Back-End Tech Lead

• Julien & François – Product Managers

• Zineb & Valentin – Product Designers

• Michael – AI Manager

• Olivier – CTO

You’ll be involved in the full development lifecycle of our platform, from brainstorming and design through to production deployment and monitoring.

Your core responsibilities will include:

• Designing and developing Semji’s core application, especially the backend: main REST API in PHP (Symfony + API Platform stack), asynchronous workers using Messenger and AWS SQS, internal APIs in PHP, Node.js or Python, and our well-structured Postgres database.

• Prototyping innovative features.

• Sharing knowledge and supporting the team (brainstorms, code reviews, pair programming…).

• Contributing to our quality-first approach: code reviews, improving the test stack, and keeping architecture, codebase, and libraries up to date.

• Maintaining and modernizing our DevOps practices and tooling (CI/CD, Kubernetes cluster, monitoring…).

• Actively improving all aspects of our current tech stack: https://stackshare.io/semji/semji (PHP 8+/Symfony 7+, Postgres 16+, Docker, AWS Cloud, JS/React, GitHub, GitHub Actions…).

Once per quarter, you’ll take part in our “Innov R&D Weeks”, where you’ll lead a technical or functional innovation project of your choice—outside of the product roadmap constraints.

• You have 4+ years of experience as a Back-End Developer, ideally within a SaaS environment.

• You’re passionate and versatile, able to tackle many problems quickly and efficiently.

• You’re autonomous, keep up with the latest tech, and care about best practices in development.

• You’re pragmatic and can propose technical solutions aligned with business needs.

• You want end-to-end ownership of the product: you’re as curious about functional product challenges as you are about infrastructure and Ops.

• Most importantly, you thrive in team environments!

• We’re looking for an experienced profile ready to bring their knowledge to our SaaS platform and team—with a long-term mindset.

  Must-Have Technical Skills

• Strong proficiency in PHP 8+, Symfony 7+, and the surrounding ecosystem

• Solid SQL skills and experience designing and scaling PostgreSQL databases

• Excellent understanding of web application architecture

• Proficient with Git

  Nice-to-Haves

• Experience with API Platform

• Familiarity with DevOps (Docker, Linux, AWS, New Relic…)

• Knowledge of JavaScript and its ecosystem

• A passion for LEGO

• And a high score at Curvytron 😉

Working Environment

• Location: Lyon 9 (Metro D – Gare de Vaise)

• High-end gear of your choice (Mac or Linux), renewed every 3 years

• Access to top-tier tools (GitHub, Copilot, ChatGPT Plus, Slack, IDE of your choice…)

• Agile methodology: Scrum & Kanban

• Hybrid setup: 2 days remote/week after onboarding

• Salary range: €42K–€55K gross/year

• One extra week of paid vacation to support work-life balance

• Sustainable mobility allowance: €500/year via Swile

• Lunch vouchers: €8 (50/50 split)

• Great health insurance via Génération (50/50 coverage)

• Top-notch coffee + beer tap

Interview Process

• Initial phone screening with Julia

• First round with Olivier Balais (CTO°

• Technical assessment with Olivier Balais (CTO) and our Tech Lead Back-End

• Final round with the co-founders