Your SaaS.
Live in 28 days.
Two senior founders ship your core flow, production-grade and ready for paying users.
Where we've built before
The four broken options
Every founder with an idea hits the same wall.
Overpay and get it slow. Underpay and get it broken. If you need a real product, there's nowhere to go.
Agency
"We have a team of 15 specialists."
€80–150k. 4–6 months. Juniors build it — you meet the salesperson.
Freelancers
"I can build it cheaper."
Designer here, dev there, AI nowhere. You become the PM. One ghosts.
In-house hire
"Long-term it's cheaper."
€155–200k/year. 6 months to ship. Neither hire knows AI.
No-code
"Build it yourself for €50/month."
Fine for a landing page. Breaks at real logic, AI, scale.
There's a fifth option. We productized it.
The flagship
Pick your cadence.
Same product, two speeds. Day 28 Live is what ~80% of founders choose. Day 14 Sprint is for the ones on a deadline.
Day 28 Live
The standard. 4-week build.
Day 14 Sprint
Premium speed. 2-week build.
50% on signature · 50% only after your written sign-off · No-Lock-In · 6-month bug guarantee
How it works
Day 0 to Day 28. Or 14, if you can't wait.
From a free plan to a live product. The build runs the same for both tiers — Day 28 Live at a sustainable cadence, Day 14 Sprint compressed 2x. You know exactly what happens before you wire a cent.
Free Build Plan
/scope · FreeAnswer 5–6 questions at /scope. Our deliberation engine returns your Build Plan — what we'd build, how, and what we won't. Free. Want to talk first? Grab a free 15-min fit check.
Founder's Audit
€497 · creditedA 60-min working call with Leander + Miraya plus a written 3–5 page teardown within 3 business days. We pressure-test the plan against your real constraints. Credited toward the build if you go ahead within 30 days.
Day 0 — scope-lock kickoff
Day 0 · 90 minYou're in: 50% deposit, then a 90-min scope-lock with Leander + Miraya. We ratify the final plan, freeze scope, set milestones, collect access. The clock starts.
Build
Day 1–13 · (Sprint: 1–6)Design and engineering in parallel. Daily progress in your Slack or WhatsApp channel — you see commits, screens, working demos as they happen.
Check-in & first live preview
~Mid-cycle · 60 minYour first live preview of the core flow working end-to-end. You see real progress and give feedback before the final stretch.
Build + polish
Day 15–28 · (Sprint: 8–14)Final integrations, polish, deployment, your custom domain wired, transactional email working. No surprises.
Live demo + sign-off
~Day 28 · (Sprint: ~14)Working product on your domain. Iterate until you sign off you're happy — then the final 50% invoices, the 30-day Sleep Well window starts, and the 6-month bug guarantee runs.
Everything included
What's inside the €15,997.
Twelve things. All included. No upsells, no "extras," no surprise invoices. Same stack ships in 28 days or 14 — only the cadence changes.
Day 0 scope-lock kickoff
€75090-min with Leander + Miraya after your deposit. We ratify the plan, freeze scope, and start the clock.
Design + UX (Miraya)
€5,500Figma design of your core flow, brand tokens, your visual identity captured. Design + UX review during the entire build.
Full-stack build (Leander)
€22,000Senior fullstack engineering on production-grade infrastructure. One core flow end-to-end, mobile-first, fast.
Production stack
€3,500Next.js + the right data layer for your build + Stripe Checkout + Customer Portal + Resend + AI via llm() facade. Custom domain on Vercel.
Admin panel pre-wired
€2,000Hidden /admin route — users, metrics, feature flags, audit log out of the box.
Day 7 check-in and first live preview
€500Mid-cycle live preview of the core flow working end-to-end, so you can give feedback before the final stretch.
Launch + founder onboarding
€750Live launch session, 1h founder onboarding, written runbook. You drive after.
30-day Sleep Well
€3,000Bug fixes and minor changes for 30 days after sign-off. No extra invoice, no clock-watching.
Managed hosting (month 1)
€500All infrastructure runs in our accounts. Zero DevOps work on your side.
Lifetime Boilerplate License
€5,000The same battle-tested foundation we ship every build on. Yours, forever, for whatever you build next.
90-day Managed Platform trial
€1,50090 days of our Managed Platform retainer included. Optional upgrade after, no obligation.
Public case study placement
€1,500Featured on diepen.io + Leander's and Miraya's LinkedIn. Optional, you choose the framing.
Four guarantees · every project
Pick the risk you're worried about. It's reversed.
Each one kills a specific fear. We're on your side of the table.
Happy-Before-You-Pay
50% on signature. Final 50% only invoices after you sign off. No client has ever paid for work they didn't love.
"What if it's not what I imagined?"
Timeline Promise
Miss the date, your invoice shrinks. €500/day on Day 28 Live, €1,000/day on Day 14 Sprint. Our slip, our cost.
"What if you blow past the deadline?"
6-Month Bug Guarantee
Any bug we shipped, we fix free for 6 months after sign-off. On top of the 30-day Sleep Well window for minor changes.
"What happens after launch when something breaks?"
No-Lock-In
Code, accounts, infra — 100% yours, written into our AGB. Full handoff on request.
"Are you going to hold my product hostage?"
Proof
We don't just build SaaS. We run one.
Most studios show you client work. We show you our own product — live, in production, with paying customers. That's the level of quality and ownership you get on yours.
AI SaaS · Live Product
Rezeptiona
An AI receptionist that turns missed calls into booked jobs.
iOS App · Live on App Store
Blooo — Organize Your Life
A task manager that makes productivity feel like play.
Who are we
A married couple that builds software together.
Not a fun fact — a structural advantage. Zero overhead between design and engineering. No handoffs, no layers between you and the builders.
Not a big agency. Not a random Upwork freelancer. Two senior engineers, married — one codes, one designs. Shipped for Handelsblatt, WirtschaftsWoche, and 25+ others — and we run our own SaaS (Rezeptiona). We don't just build and disappear — we ship them and operate them.
TypeScript, React, Node.js, Python, AWS/Azure/GCP. Production AI, real-time apps, infra for millions.
leander@diepen.io
UI/UX, React, creative coding, motion. Turns complex products into interfaces people enjoy using. Self-taught.
miraya@diepen.ioCompliance & Security
We build for your legal requirements.
Every product has compliance requirements. We don't bolt them on at the end — they're part of the architecture from the first line of code.
Built for your legal requirements
GDPR, HIPAA, SOC 2, or industry-specific — we build compliance into the architecture, not as an afterthought. Your rules, your jurisdiction.
Privacy by design
Consent flows, data processing records, and TOMs baked in from day one. We handle the technical side so you pass audits.
AI-ready compliance
LLM integrations with full compliance guardrails — data processing agreements, risk classification, and documentation for EU AI Act or your framework of choice.
Enterprise-grade security
Encryption at rest and in transit, role-based access, audit logs. Built to pass security reviews.
Common questions
We've got answers.
Day 28 Live: ~28 days from deposit to first demo. Day 14 Sprint: ~14 days. The iteration window after that is typically 3–7 days. The SOW caps each project at a soft outer bound (45 days for Live, 21 days for Sprint) — beyond that we either reach sign-off, agree on a paid extension, or refund the deposit and part ways.
Day 28 Live is the standard — about 80% of founders pick it. Properly paced, room for iteration in-cycle, sustainable. Day 14 Sprint is for founders with an external deadline (a demo, a conference, a market window). The premium covers the compression — same product, same value stack, just delivered in half the time.
50% on signature, 50% only after written sign-off. The final invoice doesn't go out until you tell us you're happy. We've never had a client pay for something they didn't love — that's the point of the structure, not a marketing line.
The Timeline Promise kicks in: €500/business day off your final invoice on Day 28 Live, €1,000/business day off on Day 14 Sprint. Our slip, our cost — not yours.
Sign-off means everything in your SOW is working the way the SOW describes. You send us a written note (email or e-signed checkbox): "I'm happy, send the final invoice." That's it. No ambiguity, no judgment calls.
You see the core flow working at the Day 7 check-in, so you can catch the direction early. After that, scope changes become paid change orders (priced à la carte) or roll into a post-launch retainer. We won't ship the wrong thing, and we won't extend the build window indefinitely — both protect you and us.
Yes. 100%. Written into the AGB. Code, accounts, designs, deploy configs — all yours from day one. Full ownership transfer per documented handoff SOP whenever you ask. No lock-in, no licensing, no strings.
No. The whole point is that you don't. You know your users and your business. We translate the rest. The strategy call is in plain language.
We are two people with our names on the door. We built our own product (Rezeptiona, live at rezeptiona.ai). We don't ghost — there's nowhere to ghost to.
Still have questions? Reach out directly — we reply personally. Send us an email or book a free call.
Plan your MVP. 60 seconds.
€15,997 Day 28 Live · €19,997 Day 14 Sprint. Both excl. VAT. Two senior founders. Your idea, live and earning.