Software Engineer (AI-centric applications)

Expleo; Elsene; Sur place; EUR 50 000 - 70 000; Plein temps

Avantages offerts par ce poste

Competitive salary

Comprehensive benefits package

Learning and development opportunities

Collaborative working environment

Flexible homeworking policy

Résumé du poste

Expleo is looking for a skilled Software Engineer in Brussels to design and implement AI-powered applications. You will play a key role in building backend services and ensuring the effectiveness of AI solutions.

Applicants should have at least 5 years of experience, strong skills in Python, and the ability to communicate fluently in English and either French or Dutch. A collaborative environment and a competitive benefits package await right candidates.

Qualifications

• Fluency in English and French or Dutch is required.
• At least 5 years of software engineering experience.
• 1-2 years of experience integrating LLMs into applications.

Responsabilités

• Design AI applications with LLMs and RAG.
• Build APIs and backend services.
• Evaluate AI application effectiveness.

Connaissances

Fluent in English and French or Dutch

Python programming

AI application knowledge

Experience in backend or full-stack development

Troubleshooting and debugging skills

Formation

Minimum 5 years of experience as Software Engineer

Outils

AI frameworks (LangGraph, LangChain)

Azure cloud environment

.NET / C#

Description du poste

Overview

Expleo is a trusted partner for your innovation journey. As a global engineering, technology and consulting service provider, we are ideally positioned to help you achieve your ambitions and future-proof your business. With a smart blend of bold thinking and reliable execution, we’re able to fast-track innovation through each step of your value chain.We are strategically positioned to build value, with a global footprint across 30 countries.We are as global and local as you need us to be, with strong best-in-class pan-European technological centers and unique best-shoring capabilities.We leverage a network of high value-adding affiliates in consulting and industrial excellence, and leading partners across multiple sectors to provide you with the most comprehensive services and solutions in an ever-changing environment.

Responsibilities

• Design and implement AI-powered applications using LLMs, RAG, and agentic workflow patterns.


• Build backend services, APIs, and integrations needed for AI-centric applications.


• Design and improve retrieval pipelines, including chunking, embeddings, vector search, hybrid search, metadata filtering, and reranking.


• Work with LLM APIs and AI orchestration frameworks to build reliable workflows.


• Implement evaluation, testing, monitoring, and observability for AI applications.


• Help define safe and practical patterns for tool use, human-in-the-loop approval, and agentic behavior.


• Collaborate with other engineers and product/business stakeholders.


• Support model and framework selection based on quality, cost, latency, maintainability, and security.


• Help troubleshoot issues such as hallucinations, poor retrieval quality, high latency, cost inefficiency, and unreliable outputs.

Qualifications

• You are able to speak, read and write fluently English and French or Dutch.


• Minimum 5 years of experience as Software Engineer, preferably in backend or full-stack development.


• Minimum 1 to 2 years of experience integrating LLMs or other generative AI services into software applications.


• Practical knowledge of RAG, embeddings, vector search, and retrieval quality improvement.


• Strong programming skills in Python.


• Experience with MCP, A2A, tool calling, or multi-agent workflows.


• Experience designing maintainable services with proper testing, logging, CI/CD, and deployment practices.


• Understanding of AI application evaluation, including test datasets, quality metrics, regression testing, and user feedback.


• Good understanding of cloud-native application development.


• Security-conscious mindset when working with internal or sensitive data.


• Ability to communicate technical trade-offs clearly and pragmatically.


• Ability to distinguish when AI, RAG, or agents are useful and when a simpler deterministic solution is better.


• Nice to Have


• Experience with AI frameworks such as LangGraph, LangChain, Semantic Kernel.


• Experience with observability or evaluation tools.


• Familiarity with Azure cloud environment.


• Experience with Microsoft AI ecosystem tools such as Semantic Kernel, Microsoft


• Agent Framework, Microsoft Foundry, or Microsoft 365 Agents SDK.


• Experience with .NET / C#.


• Experience with vector databases or enterprise search platforms.


• Experience working in regulated, security-sensitive, or enterprise environments.

Benefits

At Expleo, we are committed to providing a competitive salary and substantial benefits offering with unique wellbeing, financial and employee recognition programs.

We pride ourselves on our diverse and inclusive culture and offer a variety of family-friendly policies and enhanced leave to help you achieve a healthy work life balance.

By providing significant learning and development opportunities, we encourage individual growth and success throughout your career with us.

• Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges


• We empower all passionate technology-loving professionals by allowing them to expand their skills and take part in inspiring projects


• Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses


• Enjoy a comprehensive benefits package, including hospitalization and outpatient insurance, a pension and group insurance plan, employee wellbeing initiatives, sports and social events, gifts for special occasions, and much more!


• Enjoy meal and eco vouchers to support your daily needs and sustainable purchases


• Receive monthly representation fees to support work-related expenses


• 32 vacation days (20 + 12 for a 40-hour week).


• Always working as one team, our people are not afraid to think big and question the status quo.


• Flexible homeworking policy – Balance your career and personal life

Our Commitment to Diversity

“We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”.