AI Engineering Studio

Ship the AI feature you keep putting off — in weeks, not quarters.

Lumina is a senior AI engineering studio for B2B SaaS teams. You work directly with the engineer who designs, builds, and measures your RAG systems, agents, and automations — every build ships with an eval suite proving it works. No juniors, no agency overhead. EU/GDPR hosting available.

See what we've built

RAG searchsupport assistantsagentsworkflow automation

grounded.sh

Grounded — an accuracy-first AI support assistant designed, built, and operated by Lumina

Grounded — a production AI product we designed, built, and run. grounded.sh

Production AI on a modern, model-agnostic stack

OpenAI

Claude

Next.js

Vercel AI SDK

Python

Supabase

LangGraph

Mastra

Who it's for

Built for SaaS teams without an in-house AI engineer

You already know AI belongs in your product — support that actually answers, search that understands your docs, workflows that run themselves. But your team is heads-down on the core roadmap, and hiring a senior AI engineer isn't realistic yet. That's the gap we fill: senior AI engineering, on demand, shipped straight into your product.

You're a startup or small product team

You know AI belongs in your product — but the core roadmap comes first

Hiring a full-time senior AI engineer isn't realistic yet

What we build

Three ways to work together

Clear scope. Clear pricing. A fixed price before any build begins.

Start here

Paid Pilot

$3,500

In about a week you get production-grade code solving a slice of your use case, plus a written eval spec — the accuracy thresholds the full feature must pass. The full $3,500 is credited against a Build Sprint booked within 30 days.

Build Sprint

From $6,000

Fixed scope, fixed price, live in 2–4 weeks. We design and ship the feature into your product — a support assistant with citations, RAG search, an agent that takes actions, or a workflow automation.

Ongoing

Fractional AI Engineer

$3,500/mo

3-month minimum, then monthly. We keep the AI feature we built provably working: your acceptance eval set runs weekly with automated regression alerts, plus a monthly accuracy & cost report. Includes model and prompt maintenance as providers change, 8 hours/month of improvements (rolls over), and managed EU/GDPR hosting. Response within one business day.

Need EU-based, GDPR-friendly hosting? We deploy and manage it for you as part of any engagement. EU AI Act Article 50 compliance included in every build.

Proof

We don’t just consult — we build and run our own AI products

The fastest way to judge an AI engineer is to see what they actually ship. Here’s ours: production SaaS, designed and built end-to-end, on the same stack we’ll use for you.

grounded.sh

AI Support Assistant

Grounded grounded.sh

An accuracy-first AI support assistant for SaaS. Every answer cites its source, and it says “I don’t know” instead of guessing — built for teams who can’t afford a confidently wrong bot.

Next.jsVercel AI SDKMastraSupabase pgvector

Visit Grounded Read the case study

growthforge.space

GrowthForge — built and operated by Lumina

AI Content Assistant

GrowthForge growthforge.space

An AI blog-writing assistant that produces long-form, SEO-aware content tailored to a business’s own site and voice. A full product: real-time AI editor, content calendar, and multilingual output.

Next.jsOpenAIVercel AI SDKSupabase

Visit GrowthForge Read the case study

Process

How we work

Scoping call (15 min)

We figure out, honestly, whether there’s a real and shippable use case. If there isn’t, we’ll tell you.

Pilot or fixed plan

You see something working, and you know exactly what you’ll get and what it costs. The fixed plan includes a written eval spec — the accuracy thresholds your feature has to pass. No open-ended discovery to start.

Build & ship

You work directly with the engineer building it. Progress updates as we go, live in weeks.

Run & expand

We keep it running and add to it over time — or hand it off cleanly with docs. Your call, always.

Why Lumina

Senior from day one.

Most agencies sell you a senior in the pitch, then put juniors on the work. With Lumina you work directly with the engineer who designs, builds, and runs your system.

The builder, not a bench

You talk to — and get code from — the engineer who actually builds your system.

Less overhead, faster decisions

A small, senior-only studio means no account managers and a direct line to the person responsible for your project.

10+ years, deep in AI

10+ years full-stack, deep in RAG, agents, and AI infrastructure — the things your feature actually needs.

“Our devs and an AI coding tool could build this.”

Probably — building a demo is the easy part now. The hard part is proving it's reliable enough to put in front of your customers. That's the work we do: we write test sets and accuracy thresholds for your exact use case, wire up tracing (Langfuse) so every answer is inspectable, and ship an eval suite that measures whether it actually works — before it goes live and after every change.

Who's behind Lumina

Łukasz

Founder & lead engineer

10+ years full-stack, now designing, building, and running production AI systems for B2B SaaS — the person who scopes your project is the person who writes the code.

@luuuk_17

Risk reversal

We keep building until it passes the spec.

Before we build, we agree a written eval set with accuracy thresholds the feature must pass — and we keep working until it does. You'll always know exactly what ships, what it costs, and how “it works” gets measured.

FAQ

Frequently asked questions

Get started

Have an AI feature you keep pushing to next quarter?

Book a free 15-minute scoping call. We'll tell you honestly whether it's worth building — and if it is, exactly what it'll take.

Prefer email? Send us a message

No pitch decks. No pressure. Just a conversation about what's possible.