Choosing a SaaS Tech Stack Without Regret
By CodexierPublished 6 min read
The stack you choose for a SaaS product is a hiring decision, a hosting decision and a risk decision disguised as a technical one. Founders regret stacks not because the technology was bad but because nobody in Sweden could be hired to maintain it, the data ended up outside the EU, or the one developer who understood it left. This guide gives you a way to choose that you can defend two years from now.
The short answer
Stack choice is one of the deliverables of our MVP planning blueprint, and it is usually the shortest section, because for most products the answer is not exotic.
Why boring technology wins early
Every technology has a fixed number of surprises in it: bugs, missing libraries, hosting quirks, security advisories. Mature, widely used tools have had most of their surprises found and written up by other people. A new framework still has them waiting for you, and you will find them the week before a customer demo. Before product-market fit, your scarce resource is attention, and the stack should consume as little of it as possible.
Boring also means searchable. When a developer hits a problem at eleven at night, the question is whether the answer already exists on the internet. For PostgreSQL, React and Node it does. For last year's fashionable runtime it may not.
Frontend, backend and database choices
| Layer | Default we recommend | Reasonable alternatives | Choose the alternative when |
|---|---|---|---|
| Frontend | React with TypeScript (Next.js or Vite) | Vue, Svelte | The team already knows it well |
| Backend | TypeScript on Node, or the same framework's server side | Python (Django, FastAPI), .NET, Go | Heavy data or ML work, or an existing team skill |
| Database | PostgreSQL, managed | MySQL, SQLite for tiny tools | Almost never for a SaaS; document stores only for genuinely document-shaped data |
| Auth | A managed provider with BankID support if you sell in Sweden | Roll your own | Never for an MVP |
| Hosting | Managed platform with EU regions | Bare VPS, Kubernetes | You have an operations person and a reason |
Backend-as-a-service platforms such as Supabase or Firebase can replace the backend and database layers for an MVP. They shorten the first version considerably; the trade-off is how much logic ends up locked inside their conventions, which is covered in our separate comparison of those two.
Hosting and EU data location
Swedish and EU customers, especially public sector, healthcare and finance, will ask where the data is stored before they sign. If the answer is a US region because that was the default in the setup wizard, you lose the deal or start a migration. Pick a provider with EU regions, put the database, backups and file storage there, and check that logging and error tracking services do the same. Data residency is not the same as GDPR compliance, but it is the question buyers ask first, and answering it well signals that you know the rest.
- Database and backups in an EU region, with a documented restore test.
- File uploads in EU storage; many products forget this and keep documents in a US bucket.
- Third-party services with EU processing or a signed data processing agreement: email sending, error tracking, analytics, support chat.
- One paragraph on data location ready for the security questionnaire every larger customer will send.
Hiring and handover risk
Ask one question of every stack candidate: if the developer who chose this leaves next month, how many people within reach can take over? Search Swedish job boards for the technology's name and count. TypeScript, React, PostgreSQL, Python and .NET produce long lists. Niche languages and frameworks produce short ones, and every one of those developers knows you have no alternative. The same logic applies to agencies: a stack that only one studio in the country works with is a lock-in, whatever the contract says.
Handover risk is reduced by habits more than by choice: a README that runs the project from zero, environment variables documented, a deployment that a new person can trigger on day one, and no manual steps on a server that only one person knows about.
Stacks we would avoid for an MVP
Microservices from day one
Ten services for a product with no users multiplies deployment, monitoring and debugging work. Start with one deployable and split when a real bottleneck appears.
A framework released this year
You become an unpaid tester. Wait until the hiring market and the library ecosystem catch up.
Home-made auth and payments
Both are solved problems with security consequences. Use a provider for login, BankID and card payments.
A stack chosen for a future you do not have
Designing for millions of users before ten paying ones adds months. Your first scaling problem will not be the one you predicted.
When you do not need a stack decision at all: if the product can be validated with a no-code tool, a spreadsheet and a landing page, do that first and choose a stack when you know what you are building. And if your team already ships confidently in a mature stack we did not list, keep it; team fluency beats our defaults. If you are between those cases, book a call and describe the product; our fixed-price planning work is on the pricing page.
Frequently asked questions
Is Next.js a safe default for a Swedish B2B SaaS?
Yes, for most products with a web interface. It is widely used, easy to hire for, and hosts well on EU regions of several platforms. The main caution is not to adopt every new rendering feature at once; keep the architecture simple until the product needs more.
Should we use Supabase or build our own backend?
For an MVP with standard needs, a backend-as-a-service platform gets you to a first version faster and with less code to maintain. Build your own backend when the domain logic is complex, when you need background processing the platform does not offer, or when a customer requires hosting the platform cannot provide.
How do we add BankID to the stack?
Through a BankID broker or identity provider rather than a direct integration; the direct route requires a certificate agreement with a bank and more operational work than an MVP should take on. Choose an auth provider that supports Swedish BankID out of the box, then the stack question is settled.
Can we change the stack later?
Parts of it, yes. Swapping the frontend framework or the hosting provider is a bounded project. Changing the database or the language of the backend is a rewrite. That is why the database and backend language deserve the most thought and the frontend the least.
Choosing a stack for a product you are about to build?
Describe the product, your team and where your customers are. In fifteen minutes we tell you which stack we would use, what we would avoid, and whether a planning blueprint is worth it before you write code.
Book a free 15-minute call