Principal AI Engineer — Forward Deployed Engineer / Agentic Tech Lead

act digital; Lisboa; Presencial; EUR 90 000 - 130 000; Tempo integral

Resumo da oferta

act digital is seeking a Principal AI Engineer to join our team in Lisbon. This hands-on role is embedded with client teams, serving as a forward deployed engineer and agentic tech lead.

You will own workstreams end-to-end, architect agents, and ensure reliable, scalable production deployments. This senior position requires 4–6+ years shipping production software, with a track record in complex systems, real-world constraints, and rigorous PR reviews.

Qualificações

• 4–6+ years shipping production software.
• Experience with complex systems, multiple integrations and real-world constraints.
• Experience architecting and operating agents in production.
• You review agent-generated PRs rigorously and stand behind your sign-off.

Responsabilidades

• Own a workstream end-to-end on client engagements.
• Design and verify agent architectures and evals.
• Collaborate with clients and internal teams to deliver production-grade solutions.

Conhecimentos

Senior engineering

Agent architecture

Production systems

PR review

Descrição da oferta de emprego

Agents write the code. You decide what gets built, how it's verified, and when it ships.

About the role

As Principal AI Engineer, you are the most senior technical engineer in our embedded client teams. The role is fully hands-on, with no people management (market equivalents: Staff / Principal Engineer). You'll work embedded with the client and report to the Tech Director.

On each engagement, you'll act as Forward Deployed Engineer, Agentic Tech Lead, or both. When the team needs it, you'll also take on other technical roles.

What you'll do

Own a workstream end to end (FDE)

• Lead a workstream through discovery, delivery, and integration into the client's systems
• Hand over operations to the client's team at the end of the project, so they can run it independently

Architect and verify agents (Agentic Tech Lead)

• Design agents, defining each one's purpose, scope, and evals
• Verify at scale: agents write the code, while judgment and sign-off stay with you
• Train the client's team in agentic engineering patterns

Stay flexible

• Take on other technical roles as the team's allocation requires

What this role is not

This is not a people-management role, and you won't lead the team; that's the Tech Director's job. The role is hands-on by definition: you architect, build, and verify.

How we work

• Agentic harness: Claude Code and Cursor. You build and operate the harness that runs agents in production.
• Agent architecture: MCP, subagents, and verification loops, with a defined purpose, scope, and evals for every agent.
• Evals at scale: blocking evals in CI, a sandbox per agent, and execution telemetry (tool calls, cost, latency).
• Spec-Driven Development: an executable spec governs every change, and every agent PR gets human sign-off.
• Experimentation & FinOps: A/B testing in production, guardrails, prompt caching, model routing, and tracking token cost per delivery.

What success looks like

• Your workstream is delivered and handed over, and the client runs it with no dependency on us
• Agents are running in production under blocking evals
• Human sign-off holds up at volume
• The client's team is operating on agentic patterns

What we're looking for

• 4-6+ years of senior engineering experience shipping production software
• Experience with technically complex systems or products: multiple integrations, scale, and real-world production constraints
• You've architected and operated agents in production (purpose, scope, evals), not just used them
• You review agent-generated PRs rigorously and stand behind your sign-off

Nice to have

• Experience with experimentation platforms, A/B testing, or GenAI products
• Experience delivering while embedded with clients
• A background as a Staff Engineer with founder or deep-tech experience
• Experience as a Tech Lead or Staff Engineer with production sign-off

You’ll thrive here if you...

• Show ownership beyond your job title, through side projects, founding experience, or initiatives nobody asked for
• Challenge scope and propose better paths instead of executing blindly
• Are in a growth phase of your career and value challenge and upside over stability
• Unblock yourself without waiting for direction
• Have a track record of taking on responsibility above your title