Level

Worldline

INGENIEUR ETUDES ET DEVELOPPEMENT-Fullstack Developer

Worldline is hiring an INGENIEUR ETUDES ET DEVELOPPEMENT-Fullstack Developer in Lyon, France. Level rates it ; you can apply on Worldline.

Level's read on this job

  • Little AI ●○○○ is how Level rates this software engineer role: aI is not part of the work.
  • Tools and skills the posting cites include prompt engineering, RAG and AI agents.
  • Level lists 270 other open roles at Worldline.

AI in this role

prompt-engineeringragai-agents

Prêt à transformer la vision en action ?

Magellan est un Groupe international de Conseil en management et de Technologies. Notre force réside dans notre capacité à activer à la fois expertise métier et maîtrise technologique pour accompagner les entreprises et les organisations publiques dans toutes leurs transformations. 

VISION IN ACTION

Dans un environnement où les mutations s’accélèrent, les organisations doivent en permanence réinventer leurs modèles pour rester compétitives. Pour y répondre, nous accompagnons nos clients de la définition de leur stratégie à sa mise en œuvre opérationnelle, en combinant expertise métier, maîtrise technologique et capacité d'exécution.

Rejoindre Magellan, c’est intégrer un collectif de 6 700 talents engagés, unis par une même exigence : accompagner les enjeux de nos clients dans toute leur complexité pour construire des solutions concrètes et activables au plus près des réalités du terrain. Magellan figure parmi les entreprises où faire accélérer sa carrière (Classement LinkedIn Top Companies 2026).

Au sein de la business line Strategic Solutions & Services, le pilier Omnichannel Interactions accompagne les organisations dans la transformation de leur expérience client. Il mobilise l’expertise métier, les technologies de centres de contact et l’intelligence artificielle pour concevoir des interactions plus fluides, personnalisées et performantes.

En intégrant l’IA au cœur de nos solutions, nos équipes conçoivent des solutions permettant aux organisations d’automatiser les parcours clients complexes tout en maintenant une supervision humaine là où elle est essentielle.

The opportunity

Multi-agent architectures are no longer science fiction: they already handle millions of customer interactions (voice, email, chat, social media), automatically processing simple cases and intelligently escalating complex ones to human advisors.

 In this fast-moving environment, We are expanding our Agentic AI platform to fully integrate voice, chat, and orchestration capabilities into our CCaaS solution. The ambition is clear: build a truly unified, AI-native contact center that elevates both customer experience and agent productivity, while positioning us at the forefront of the next wave of customer engagement.

Day-to-day responsibilities

  • You contribute to the full development and maintenance lifecycle of our Agentic Platform, actively participating in project delivery phases.
  • You specify, design, and develop APIs and Web services, while writing and maintaining robust unit and functional tests.
  • You identify, challenge, and analyze both functional and technical requirements to deliver value-driven solutions.
  • You work on a microservices-based architecture deployed on our Sovereign Cloud or on the Google Cloud Platform, leveraging a modern and diverse tech stack — Java/ Kotlin, Angular, Spring, Docker, Kubernetes, and more — within a cutting-edge engineering environment built on Clean Architecture, design patterns, and dependency injection.
  • You apply engineering best practices: code reviews, merge requests, automated testing, and continuous integration (GitLab CI).
  • You build and extend the harness of our AI Agent, enhancing state-of-the-art LLMs with custom capabilities (connectors, RAG) to deliver high-quality support powered by internal knowledge base.
  • You drive continuous improvement of our processes through an SRE-oriented approach, industrializing and scaling the solution.

Who are we looking for

We are looking for people capable of driving positive change, moving forward, and showing the way — passionate individuals with a positive attitude and a thirst to learn and progress. In practice, this means:

  • You have a global vision and end-to-end technical understanding of an IT service: application, underlying infrastructure, and related dependencies.
  • You have solid knowledge of Cloud computing and a strong sensitivity to DevOps and FinOps practices.
  • You have hands-on experience with Agentic technologies, prompt engineering, or harness engineering.
  • You demonstrate initiative, proactivity, rigor, and autonomy within your area of responsibility.
  • You are curious and value teamwork and customer service.
  • You are motivated and passionate about the Agentic revolution.
  • You thrive in a diverse and challenging technical environment.
  • You are fluent in spoken and written English.

Perks & Benefits

Parce que votre bien-être et votre évolution professionnelle comptent, nous vous proposons un environnement de travail stimulant et avantageux :

 

🚀 Développez vos compétences

Accédez à un large choix de formations, en présentiel comme en e-learning, pour progresser tout au long de votre parcours

💰 Une rémunération enrichie

Bénéficiez de primes de participation, d’intéressement et de vacances

🏡 Un équilibre vie professionnelle / vie personnelle

Charte de télétravail

🎟️ Les avantages du Comité Social et Économique

Subventions pour vos vacances et vos loisirs, billetterie à tarifs préférentiels, et bien plus encore

🌴 Du temps pour vous

Disposez de 32 jours de congés payés par an, des RTT et selon votre ancienneté, des jours de congés supplémentaires

💊 Une protection santé

Bénéficiez d’une mutuelle pour vous accompagner au quotidien et de la prévoyance

🚴 Des trajets domicile-travail mieux pris en charge

L’entreprise prend en charge plus de 50 % de vos abonnements aux transports publics

 

 

Vos ambitions correspondent à nos valeurs ? N'hésitez plus.

En rejoignant Magellan, vous intégrerez des équipes pluridisciplinaires et contribuerez à des projets concrets, au cœur des grandes transformations : IA générative, plateformes intelligentes, impératifs sociaux et environnementaux, etc.

Ce que Magellan vous garantit : une expérience professionnelle humaine, apprenante et épanouissante.

Rejoignez une communauté riche de sa diversité, où chaque culture et chaque compétence unique constitue la force des équipes.

How we rate this

INGENIEUR ETUDES ET DEVELOPPEMENT-Fullstack Developer at Worldline rates 29 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

  1. ●●●● Builds AI80 to 100
  2. ●●●○ Works on AI60 to 79
  3. ●●○○ Uses AI40 to 59
  4. ●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.

Prepare for this job

Built from this posting and from similar jobs on Level.

Skills and AI tools this role asks for

Prompt engineeringRAGAI agents

Also common in software engineer jobs at this level

Pay

Typical software engineer job
$168k

This posting doesn't list pay. Use the typical software engineer figure when pay comes up. See software engineer jobs

Questions you could be asked

  1. How do you structure and test a prompt to get consistent output from a language model?
  2. How would you design a retrieval step so the model answers from real data instead of guessing?
  3. How do you decide when an AI agent can act on its own versus asking for approval first?

Adapt your resume

  • List these exact terms on your resume: Prompt engineering, RAG, and AI agents. An applicant tracking system matches the wording, not the idea.
  • Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.

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