AI Systems Engineer

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Sint-Pieters-Woluwe

Hybrid

EUR 55,000 - 90,000

Full time

14 days+

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Benefits offered by this job

Snacks, fruits and unlimited coffee

Net allowances, hospitalisation and g.

Hybrid and flexible working culture

Car & fuel or mobility budget

Pleasant working environment

Teambuildings and yearly holiday retre

Job summary

Sagacify, part of Craftzing, seeks a Mid-Level AI Systems Engineer to design, build, deploy and operate production-grade AI systems with emphasis on generative AI and reliable ML operations. You’ll split time between AI engineering and MLOps to ensure end-to-end quality.

You’ll collaborate across Sagacify and Craftzing teams, report to the Head of ML, and grow toward leadership roles as you master LLM-based applications and scalable AI services.

Qualifications

3–5 years of AI/ML engineering or related fields
Solid understanding of LLM fundamentals: Transformers, attention mechanisms, generation parameters and fine-tuning
Strong problem-solving ability and algorithmic creativity
Clear communication with technical and non-technical stakeholders
Team spirit and collaboration across multiple roles
Rigour, responsiveness and incident-handling mindset
Autonomous, curious, quick to learn new tools
Fluent in Dutch, English and French (or at least the first two languages)

Responsibilities

AI Engineering: orchestrate AI system components (LLMs, vector DBs, APIs, orchestration layers, UIs)
Develop autonomous agents and conversational systems
Build and optimise RAG pipelines connecting data sources to LLMs
Evaluate system quality with AI metrics and production monitoring
Deploy and scale with attention to latency, security, reliability and cost
Stay updated with LangChain, LangGraph, Langfuse and other tools
Prompt and context engineering to improve output and manage state
MLOps: build CI/CD pipelines and automated tests
Monitor production models and drift; manage library/model updates and safe rollouts
Collaborate with ML engineers, DevOps and infra teams
Keep up with latest MLOps practices and tools

Skills

AI/ML engineering

Problem solving

Clear communication

Autonomy

Team collaboration

Tools

Python

OpenAI API

Hugging Face Transformers

LangChain

LangGraph

Langfuse

FastAPI

Docker

Kubernetes

CI/CD pipelines

AWS

Job description

Want to create a positive impact through AI?

Craftzing and Sagacify are looking for a Mid-Level AI Systems Engineer who is equally at home shipping an agent to production as debugging why it drifted three weeks later. Someone who does not see building AI systems and operating them as a trade-off, but as two things that make each other better.

Do you get energy from designing LLM-powered agents and RAG pipelines while staying just as sharp on monitoring, CI/CD and safe rollouts once they're live? Then you will probably feel right at home here.

Your Role

We're on the lookout for a Mid-Level AI Systems Engineer who bridges AI engineering and MLOps. Someone who loves getting hands-on with LLMs, agents, and RAG pipelines, and who cares just as much about what happens once a model reaches production as about building it in the first place. In this role, you'll design, build, deploy, and operate production-grade AI systems, with a strong focus on generative AI, LLM-based applications, and reliable machine learning operations. In practice your time is split roughly between 60-70% AI Engineering and 30-40% MLOps.

In this role you sit at the intersection of engineering and operations, working across teams and disciplines. You'll report to the Head of ML at Sagacify and collaborate with the wider Sagacify and Craftzing delivery organisation. A role that can naturally grow towards a Team Lead position over time.

What You’ll Do

AI Engineering (60-70%)

Orchestrate AI system components: LLMs, vector databases, APIs, orchestration layers, and user interfaces

Develop autonomous agents and conversational systems that can plan actions and interact with external tools or APIs

Build and optimise RAG pipelines connecting enterprise data sources to LLMs for grounded, contextualised, reliable answers

Evaluate system quality through generative AI metrics, coherence tests, and production monitoring (latency, API costs, bias)

Deploy and scale solutions with strong attention to latency, security, reliability and cost efficiency

Keep an eye on the ecosystem for new models, frameworks and techniques, including open-source tools such as LangChain, LangGraph, Langfuse, etc.

Perform prompt and context engineering to improve output quality, reduce hallucinations, and manage conversational state effectively

MLOps (30-40%)

Build and maintain automation for model deployment, including CI/CD pipelines and automated testing

Continuously monitor model performance in production, including drift detection and quality metric tracking

Manage updates of libraries, models, and related dependencies in production environments

Ensure versioning, reproducibility and safe rollout of models and AI services

Collaborate closely with ML engineers, developers, DevOps and infrastructure teams for smooth delivery

Stay current with the latest MLOps practices, tools and platform components

You stay in the code, you stay curious about what happens after deployment, and you keep learning as you go.

What You’ll Work With

Core technologies :

Python

OpenAI API, Hugging Face Transformers

LangChain, LangGraph, Langfuse

FastAPI or Flask, Docker, Kubernetes, CI/CD pipelines

Cloud GPU

AWS (S3, SQS, IAM, RDS, etc.)

Bonus Points For Experience With

TypeScript

Azure

AI-native engineering workflows: hands-on experience using AI coding agents and AI-assisted development environments (Cursor, Claude Code, Windsurf, Copilot, etc.), including context engineering, subagent orchestra…

About You

You have 3 to 5 years of experience in AI/ML engineering or related fields

You have a solid understanding of LLM fundamentals: Transformers, attention mechanisms, generation parameters and fine-tuning approaches

You have strong problem-solving ability and algorithmic creativity

You communicate clearly with both technical and non-technical stakeholders

You have a team spirit and enjoy collaborating across multiple roles

You bring rigour, responsiveness and a good incident-handling mindset

You're autonomous, curious, and quick to learn new tools

You can communicate fluently in Dutch, English and French, or at least the first two languages

Don’t worry if you don’t tick every single box, what matters most is the right mindset and a drive to learn. If you think we’re a match, we’d love to hear from you.

Why You Will Love Working With Us

Sagacify is part of Craftzing, and together we build AI solutions that create lasting impact for our clients. You will be part of a team of enthusiasts who love to learn, continuously develop new skills and fast-track our customers' AI journey across various industries.

At Craftzing and Sagacify, you get the trust and space to do your best work - in a human-sized environment with real team spirit, flexible working and room to take ownership.