01
Discovery
ICP, user signal, and competitive context so you build the right thing - or walk away before spend piles up.
Application
Build a productthat grows
For founders and product teams who need software that ships, scales, and stays yours - validated scope, senior craft, flat price.
The problem
When you need a real product,not a prototype
Ideas stall in demos, scopes drift, platforms hit ceilings, and nobody owns the codebase. That is how months disappear without a product users trust.
What looked fine in a demo breaks under real users, real data, and real edge cases. Every week of patches makes the rebuild harder.
What we offer
From discovery toproduct that ships
We cover the full path - research and strategy through design, architecture, build, launch, and growth - scoped to your stage.
02
Strategy
Positioning, offer, and roadmap locked to revenue - not a kitchen-sink backlog dressed as a plan.
03
UX/UI
Flows and interface craft that feel intentional - high signal screens, not generic AI templates.
04
Architecture
Data model, auth, integrations, and stack choices that match your stage and leave a clean path to scale.
05
Build
AI-assisted custom code by default, Bubble when the stage calls for it. Weekly demos, fixed scope, no surprise creep.
06
QA & launch
Test what users will hit, then go live with monitoring, handoff docs, and a clear cutover plan.
07
Optimise
Post-launch iterations from real usage - fixes, features, and performance that compound after day one.
08
Marketing
In-product and go-to-market support when the build needs acquisition and activation, not just code.
Use cases
Highest-ROI outcomesby product type
Pick MVP, platform, or rescue. See the outcomes that usually pay back first - before to after, with why it matters.
MVP
Idea to first users
Auth
Core flow
Feedback
Before
A pitch deck and scattered notes - no product people can try.
After
A scoped MVP live with auth, core flows, and a clear path to feedback.
Why it pays: Real signal in weeks, not months of speculative build.
“1000 users in first 3 months, 20% conversion rate, 2 official sponsors inside first 2 months. They have a great team.”
Case studies
Applications we've put to work
Why this works
Product judgment,not just tickets
We build our own products too - so we scope for ownership, speed, and what users actually do. The Eterna Method keeps the build honest from first call to launch.
We ship our own apps
Same craft bar we bring to client work - architecture, UX, and the hard calls that keep a product alive after launch.
Methodical from day one
Validated scope, senior delivery, flat price. You see the approach before you see the invoice grow.
Code and IP you own
No platform lock-in theater. You leave with a product your team - or another partner - can keep shipping.
How we build
No-code or custom.We pick the lane.
Both lanes ship real products. The choice is stage, ceiling, and how hard you need to own the stack later.
Default lane
AI-assisted custom code
Default for new products that need to scale, integrate deeply, or escape platform ceilings.
CursorClaude CodeNext.jsSupabase
You own the repo. We move fast with AI assistance without shipping vibecode debt.
When it fits
No-code (Bubble)
Strong when speed-to-validate matters, the team already lives in Bubble, or the product fits the platform well.
BubbleXanoAPI connectors
We still spec first. If you later hit the ceiling, we plan a clean migration to owned code.
Stack
Practical toolswe ship with
The same lanes we use on our own products - picked for the job, not for a tool fad.
AI-assisted engineering
Cursor · Claude Code · GitHub
Senior review on every critical path - speed without vibecode debt.
Product surface
Next.js · TypeScript · Tailwind
Default for owned products that need craft, performance, and room to grow.
Data & backend
Supabase · Xano · Postgres
A real data layer when spreadsheets and plugins stop being enough.
No-code when it fits
Bubble · API connectors
Strong for validation and Bubble-native products - with a clean exit path when you outgrow it.
Ship & operate
Vercel · Railway · Monitoring
Hosting, deploys, and enough ops so launch is not a one-night gamble.
Challenges
The typicalfounder journey
Six moments where most products lose the plot. Hover to pause, click to jump.
Friends and family love it. LinkedIn, a few intros. Feels like validation. It isn't.
Eterna Method
Validate. Spec.Ship. Compound.
Our named delivery system for Application builds - four human-gated steps so AI speed never skips judgment. Six engines run inside the loop from research to retention.
- 01
Validate
Strategy, ICP, and real-user signal before a line of code. Walk away cheap if it is not real.
Your gate: You approve go / no-go before build spend.
- 02
Spec
Stage-right architecture, UX, and scope locked to the path to revenue - not a kitchen-sink backlog.
Your gate: You approve the plan, stack, and milestones.
- 03
Ship
Design and engineering in parallel with full visibility. Production-ready, not demo-ready.
Your gate: Weekly reviews - you stay in control of scope.
- 04
Compound
Acquisition, activation, retention, and analytics as one loop - so launch is the start, not the finish.
Your gate: North Star and next bets are agreed together.
Traditional way
- Weeks of discovery decks before anything usable
- Ship a demo, then discover the product does not retain
- Acquisition spend into a leaky bucket
- Analytics bolted on after launch
Eterna Method
- Working signal and a go / no-go in days, not months
- Production path from day one - owned code, real users
- Fix retention before you scale spend
- North Star and events live with the build
Six engines inside the method
The failure points every product hits
Open an engine to see how we research, engineer, acquire, activate, retain, and measure.
Client stories
What clients sayafter we ship the product
Stefanie Herbert
Co-founder, Relative Innovations
“Working with Marko has been an incredible experience from start to finish. He went above and beyond to bring our vision for our CRM platform to life not only executing what we asked for, but also offering valuable suggestions that improved the overall design and functionality.”
Dr. Vladimir Cvetkovic
Founder, ProSafeNet
“1000 users in first 3 months, 20% conversion rate, 2 official sponsors inside first 2 months. They have a great team, and they were great!”
Marko Savic
Founder, PetsPilots
“Eterna built our app for pet transport, and they were amazing from day 1, and have been our partner not only in development but also helping us what to build next. Highly recommend!”
Process
How weship products
Step 1
Blueprint
Free Scope Session - app map, hero preview, flat price, and timeline before any build commitment.
Step 2
Build
Fixed-scope sprints with weekly demos. You stay in control of scope; we stay accountable to the plan.
Step 3
Launch + Care
Go live with monitoring and handoff, then optional Care or Growth retainer as the product evolves.
Investment
Clear bands.Scoped outcomes.
Prices are starting bands. Exact scope lands in your free Blueprint after a strategy call.
MVP build
For validating an idea with real users. Core product, flat price, owned code - no extras, still powerhouse.
Starting from
€4.000
Popular
Full product
Validated scope, competitive features, ready to acquire users - engineered to scale.
Starting from
€8.000
Enterprise platform
For businesses and founders building multi-sided platforms, AI-native tools, or enterprise-grade products.
Starting from
€15.000
Need ongoing releases after launch? Ask about Care, Growth, and Scale retainers - scoped by outcomes, not vague hours.
“He went above and beyond to bring our vision to life - not only executing what we asked for, but offering suggestions that improved the design and functionality.”
Questions
Application FAQfor founders and teams
Featured resource
Read beforeyou scope
Ready to build a product that grows?
Book a free 15-minute strategy call. We will confirm fit and whether a Blueprint or a lighter next step makes sense.