Junior Python Developer, Agentic AI

Wemanity Reply Belgium; Brussel; Sur place; EUR 60 000 - 90 000; Plein temps

Résumé du poste

Reply Belgium is seeking a backend software engineer to design and build backend services and agentic components in Python, from prototype through production.

You will integrate LLMs and agent frameworks with enterprise systems, work with SQL/NoSQL databases and cloud services, and collaborate with clients and senior engineers across borders.

Qualifications

• Degree in Computer Science, Computer Engineering, Software Engineering or equivalent technical discipline
• Solid Python fundamentals demonstrated via projects or internships
• Experience with relational/NoSQL databases, REST APIs, message queues, and container tooling (Docker)
• Proficient English, professional level; French or Dutch at professional level preferred
• Curiosity and fast learning ability; ability to work in a specialist team

Responsabilités

• Design and build backend services and agentic components in Python from prototype to production
• Integrate LLMs and agent frameworks with enterprise systems via APIs, queues and data stores
• Work with SQL and NoSQL databases, vector stores, containers and cloud services (AWS, Azure, GCP)
• Contribute to architecture discussions and evaluation of new models and tools
• Collaborate with clients and senior engineers across Reply companies on multi-country programmes

Connaissances

Python fundamentals

English

French or Dutch

Teamwork

Curiosity / Willingness to learn

Formation

Bachelor's or Master in Computer Science/Engineering

Outils

Docker

Git

REST APIs

Description du poste

The company you would be joining

Reply is a network of highly specialised companies operating in digital transformation, cloud, data and artificial intelligence. In 2025 the group closed at EUR 2,483.6 million in revenue with 16,624 people, up from EUR 277.2 million and 2,272 people in 2007.

At the end of H1 2026 the group counts 17,297 people. Growth has been continuous, organic and profitable for close to two decades.

The model is deliberate. Instead of one large generalist consultancy, Reply is built as a federation of focused companies, each one specialised in a technology, a platform or an industry, working together on large multi-country programmes. The practical consequence for an engineer is that you are surrounded by people who go deep rather than wide, and that the project you work on is staffed by the specific companies that own that competence, whether they sit in Brussels, Luxembourg, Milan, London or Düsseldorf.

Reply holds the highest partnership tiers with the major technology vendors, including AWS Premier Partner, Google Cloud Premier Partner, Microsoft Global Partner, Oracle Global Partner, Salesforce Summit Partner, SAP Gold Partner and Adobe Platinum Partner, and works directly with the leading players in AI including Anthropic, OpenAI, Mistral, NVIDIA and Databricks.

This gives our engineers early access to platforms, roadmaps and product teams, often before those technologies reach the wider market.

The team

You would join the Belgian AI transformation team, a small, senior group delivering agentic AI systems for major financial institutions and large corporates in Belgium and Luxembourg.

The work is production work: multi-agent architectures, retrieval and document intelligence pipelines, tool-calling agents integrated into core business processes, and the engineering discipline required to run all of that in regulated environments.

The team operates as one of the group's innovation teams.

Technology choices move quickly, the client base is demanding, and the standard for what gets shipped is high.

What you will do

• Design and build backend services and agentic components in Python, from prototype through to production
• Integrate LLMs and agent frameworks with enterprise systems through APIs, message queues and data stores
• Work with SQL and NoSQL databases, vector stores, containerised deployments and cloud services (AWS, Azure, GCP depending on the client. or on-prem)
• Contribute to architecture and design discussions, and to the evaluation of new models, frameworks and tools
• Work directly with clients alongside senior engineers and architects, and with colleagues from other Reply companies on multi-country programmes

What we are looking for

• A degree in Computer Science, Computer Engineering, Software Engineering or a comparable technical discipline
• Solid Python fundamentals, demonstrated through academic projects, internships, personal projects or open source contributions
• Working knowledge of the technologies that support modern development: relational and NoSQL databases, REST APIs, message queues, Docker or equivalent container tooling, Git
• English at professional level, plus French or Dutch at professional level. Client work in Belgium and Luxembourg requires it
• Genuine curiosity and the will to learn fast.
• The ability to work in a team of specialists that wants to make you grow

Experience with LLM frameworks, cloud platforms or agentic architectures is welcome but not required.

What is required is the aptitude and the drive to reach that level quickly, with support.

What we offer

• Continuous training, certification paths on the platforms of our technology partners, and access to Reply's internal knowledge network across all group companies
• International exposure: Reply operates in 15 countries and project teams are frequently cross-border, with opportunities to work with and travel to other Reply companies
• A career path built on technical depth.
• Work on some of the most advanced AI programmes currently running in the Belgian and Luxembourg financial sector