SaaS MVP Development for Founders
SaaS MVP development is the work of turning a product idea into the smallest version real customers can sign up for and pay for. Elevio Solutions is a founder-led software studio in Belgrade that builds SaaS MVPs on fixed written scope, from EUR 10,000, using the same stack that runs our own SaaS product in production.
That last clause is the part worth checking. Ask an agency selling SaaS development to show you the SaaS they operate. Ours is Polyglot Translate Cloud, a translation platform live in production, with real subscribers, real billing, and a database large enough that the decisions in it had to be right the first time.
If you are a founder, that changes the conversation. You are not explaining churn to a contractor. You are talking to people who have already made the decisions you are about to make: what to cut from version one, when a background queue is worth its complexity, what actually breaks in production. The studio was founded in 2025 on more than eight years of professional development experience, and we build for founders and companies in the US, EU, Gulf, and Serbia.
A Product Studio Is Not a Dev Shop
The dev-shop model is body leasing. You rent hours, the shop bills hours, and the economics quietly reward the project taking longer. A studio that ships its own SaaS sits on the opposite side of that incentive: our proposals fix scope and price in writing before any code, because that is the deal we would want as buyers.
| Question | Dev shop (body leasing) | Product studio that ships its own SaaS |
|---|---|---|
| What you are buying | Hours and headcount | A working product at a fixed written price |
| Incentive | More billable hours | Ship on scope, because the price does not grow with the timeline |
| Production experience | Depends on which team you get | Runs Polyglot Translate Cloud in production, on a 72GB database |
| Testing culture | Whatever the contract requires | Every release is checked automatically, because we are the ones woken up when it is not |
| Stack decisions | Whatever the bench knows this quarter | The stack we already operate at production scale |
| After launch | Off to the next client | Ongoing partnership from EUR 350/month, run the way we run our own products |
The Stack, and Why It Is This One
Our default SaaS stack: Node.js 20+ with TypeScript, Express 4 for the API, Next.js 14 for the dashboard, PostgreSQL 16 with Prisma for data, Redis 7 with BullMQ for background jobs, LemonSqueezy for billing, and DigitalOcean for hosting.
This is not a list assembled from trend articles. It is the exact stack under Polyglot Translate Cloud, where the Prisma schema has grown to 62 models and the production database to 72GB. We recommend these tools because we live with them daily and know where each one bites. When your product genuinely needs something different, the proposal will say so and explain why, in writing.
How an MVP Gets Built Here
1. Discovery call
We talk through the product, who pays for it, and what the smallest sellable version looks like. Expect us to argue for cutting features. Version one earns the right for version two to exist; it does not need every idea from the pitch deck.
2. Fixed scope
You get a fixed written proposal before any code: what gets built, what it costs, and what is explicitly out of version one. That last list is the most valuable page in the document: it is where scope creep goes to die.
3. Build, with weekly clickable demos
Every week you click through the real product, not a slide about the product. Feedback lands while changes are still cheap, and you always know exactly where the build stands.
4. Launch
Speed and security hardening before go-live. Every public form ships with nonce checks, a honeypot, and rate limiting as the minimum. Performance is treated as a requirement, not a hope.
5. Support
Software needs an owner after launch. Either we stay on as the ongoing partner, or we hand over a documented codebase your future team can pick up without archaeology.
The Proof Runs in Production
Polyglot Translate Cloud is our own SaaS: a translation platform with a 3-engine cascade (self-hosted OPUS-MT, Gemini Flash-Lite, self-hosted Argos) and a self-learning Translation Memory that stores approved segments and serves repeats free, graded through candidate, verified, and gold trust tiers. Subscription billing and background queues are in daily use, and every release is checked automatically before it reaches a paying customer.
Probably the only honest way to prove you can build and run a SaaS is to build and run one. The full story is in the Polyglot Translate Cloud case study, and the reasoning behind it is in why we build our own SaaS products. The client work lives in our portfolio.
AI Features Your Users Can Trust
The cheap version of an AI feature is a thin prompt with a spinner. We build them with more care. Our Help Forge helpdesk plugin, live at its first client, ships multi-vendor BYOK integrations with adapters for Anthropic, OpenAI, Gemini, and DeepSeek, with API keys encrypted at rest. Bring your own key means you control the vendor relationship and can switch providers without a rebuild.
We also run a medical-context AI support chatbot in production, built around a deterministic safety layer that restricts the LLM to extractive rephrasing of approved content. It is engineered so the AI is never allowed to guess. That is the bar we bring to AI features in your product: AI in the engine, humans at the wheel. For where this is heading, see AI in web development in 2026.
What You Get
- A production-ready SaaS built on Node.js 20+, TypeScript, and PostgreSQL 16, with Prisma migrations from day one
- A documented REST API built on Express 4
- Authentication, authorization, and role-based access control
- Subscription billing wired end to end, using the same LemonSqueezy pattern we run ourselves
- Background job infrastructure on Redis 7 and BullMQ where the product needs it
- An automated test suite that grows with the codebase
- An admin dashboard on Next.js 14
- Deployment on DigitalOcean, the platform Polyglot Translate Cloud runs on
- Full source code ownership, with nothing proprietary tying you to us
What It Costs
Custom SaaS starts at EUR 10,000. Smaller web platforms start at EUR 5,000, and ongoing partnership after launch starts at EUR 350/month. Every engagement begins with a fixed written proposal before any code, and we reply within 24 hours.
If EUR 10,000 is beyond the current budget, say so on the call. Sometimes the right first step is a leaner platform, a custom plugin on top of a system you already run, or a tech consulting engagement to pressure-test the plan before anyone writes code. The full menu is on the services page.
Frequently Asked Questions
How long does a SaaS MVP take to build?
It depends on scope, which is exactly why we fix scope in writing before any code. The proposal includes the delivery plan for your specific feature set, and weekly clickable demos make progress visible rather than promised. The strongest lever on timeline is cutting version one down to what customers will actually pay for, and we will push you on that during discovery.
Which stack will you use for my product?
By default, the one we operate ourselves: Node.js 20+ with TypeScript, Express 4, Next.js 14, PostgreSQL 16 with Prisma, and Redis 7 with BullMQ, hosted on DigitalOcean. It is proven under our own production load, and hiring developers for it later is straightforward. If your product justifies a different choice, the proposal will name the tool and the reason.
What happens after launch?
You choose. Ongoing partnership from EUR 350/month covers maintenance, monitoring, and continued feature work, with the same discipline we apply to our own products. If you are hiring an in-house team instead, you get a documented codebase, full source ownership, and a clean handover.
Can you build AI features into the MVP?
Yes. We have shipped multi-vendor BYOK AI integrations with adapters for Anthropic, OpenAI, Gemini, and DeepSeek, with keys encrypted at rest, and we are building a medical-context chatbot around a safety layer that never lets the model guess. The pattern transfers to your product: vendor flexibility through your own API keys, and guardrails designed before the first prompt is written.
How do you handle billing and subscriptions?
The same way we handle our own. Polyglot Translate Cloud runs subscriptions through LemonSqueezy. For an MVP this is usually the right shape: a hosted billing provider takes on checkout and invoicing while your application stays the source of truth. If you prefer a different provider, that is a scoping conversation, not a rebuild.
Start the Conversation
Send the idea, however rough, through the contact page. You will get a reply within 24 hours and a fixed written proposal before any code. If you want to know who you would be working with first, the short version is on the about page: a founder-led studio in Belgrade that builds by hand and tests like it plans to keep the software running. Because it does.