As part of our development, we are looking for an AI Native Developer.
TrustUp
, a fast-growing Belgian scale-up, has a clear mission: to transform the renovation sector by introducing the first platform connecting individuals and building professionals. Imagine the of construction, but better In parallel, we offer professionals a complete suite of management tools to simplify their administrative work.
Experience:
Minimum 5 years in a company
Sector:
SaaS/web app at large scale
Contract:
Permanent or freelance
3 days of remote work/week
Scope:
AI and autonomous agents are at the core of our product strategy. We are looking for engineers who want to build the future, not maintain the past.
You will join an
independent delivery squad
, alongside a product specialist and UI designers. Together, you are responsible for
end-to-end
: from gathering requirements, to building, testing, and production deployment. No silos, no handoffs — you are involved at every step.
As an AI Native Developer, you design, specify, and deliver complete features. You actively build the AI features of our products and work in a
spec-driven
manner.
Your key responsibilities:
* Spec & Design
: Transform product briefings into detailed technical specs, serving as a contract between teams and input for AI agents.
* Build Full Stack
: Develop complete features (backend, frontend, APIs) in direct collaboration with product and design within your squad.
* Build AI & Agents
: Design AI features — integrating LLMs, autonomous agents, RAG, function calling, MCP servers — integrated into our products.
* Architecture
: Drive architectural decisions (API design, data modeling, caching, sync/async, scaling) with reasoned trade-offs.
* Quality
: Tested, maintainable, documented code. Code reviews, CI/CD, production monitoring.
* Ship & Iterate
: End-to-end ownership, from briefing to post-deployment monitoring. Measure impact, iterate.
Job requirements
Essentials
* Experience
: 5+ years in software development on large-scale SaaS or web applications.
* Full Stack Profile
: Comfortable with backend (APIs, databases, services) and frontend (interfaces, components).
* AI/Agents Experience
: You have built features with LLMs (OpenAI, Anthropic, etc.), agents, RAG, function calling, or agent orchestration.
* MCP Knowledge
: Understanding of connecting an LLM to internal data and tools via MCP (Model Context Protocol). Ideally, you have built or consumed an MCP server.
* Spec-Driven Approach
: Writing detailed technical specs from a product briefing and using them as a contract and input for AI agents.
* Solid Architecture
: Pragmatic mastery of SOLID principles and design patterns (Factory, Strategy, Observer, Adapter, Facade).
* AI Tools
: Daily use of AI tools for development (Cursor, GitHub Copilot, Claude Code, or equivalent).
* Autonomy
: End-to-end ownership, from briefing to post-deployment monitoring.
* Team Spirit
: Comfortable in a cross-functional squad, working daily with product and design.
* Languages
: Fluent in French or/and English.
Nice to Have
* Experience with agent orchestration frameworks (LangChain, CrewAI, Anthropic Agent SDK, AutoGen).
* Experience building MCP servers.
* Knowledge of multiple stacks (Python,, PHP, Go) and ability to switch.
* Performance optimization: query tuning, execution plans, advanced indexing.
* DevOps/infra: CI/CD, containers, IaC, observability.
* Open-source contributions or personal AI projects.
* Varied experience: multiple companies, multiple contexts.
How do we work?
* Autonomous Squads
: Operating in independent end-to-end delivery squads (Developer, Product Specialist, UI Designers). The squad is responsible for everything: from requirements to delivery.
* Spec-Driven
: Each feature is specified before development. Specs serve as living documentation and input for AI agents.
* Monthly Event
: Monthly team event to disconnect and strengthen the team.
Our Tech Environment
We are intentionally
tech-agnostic
in recruitment. What matters is your ability to navigate any ecosystem.
* Backend & APIs
: API-first architecture, microservices, event-driven.
* Frontend
: Modern web applications, reusable components, state management.
* AI & Agents
: LLMs (OpenAI, Anthropic), MCP servers, RAG pipelines, autonomous agents in production.
* Data
: Relational and NoSQL databases, caching, search engines.
* Infra
: CI/CD, containers, monitoring, alerting.
Why Join Us?
* Direct Impact
— products used by thousands of professionals and individuals in construction.
* AI in Production, Not POC
— building real AI features and agents, with MCP servers, RAG, all in production.
* Delivery Squads
— developers work in autonomous squads with product and design. End-to-end, from requirements to delivery. Zero handoff, zero dependency.
* Spec-Driven Culture
— rigor and quality as standard. Specs drive the code AND the agents.
* Total Autonomy
— zero micro-management, seniors drive their features from A to Z.
* Ambitious Scale-up
— European expansion, lots to build, real challenges.
* Great Atmosphere
— collaboration, constructive code reviews, zero toxic politics.
Ready to build AI products with real impact? Apply now.