SaaS Product Development
HelloDevs builds SaaS products — from a first version you can charge for to a platform that holds up as it grows.
- Six years building software
- Our own SaaS products in production
- Your code, your repository, from day one
Most agencies build SaaS products. Fewer have run one after launch. HelloDevs operates several — a team management platform, a messaging product, and five apps with subscription billing. That is the difference between knowing how to build billing and knowing what happens when a card declines on renewal day.
What a SaaS needs that other software does not
What a SaaS needs that other software does not
A SaaS product is not a web app with a login. These are the parts that get underestimated, and every one of them is cheaper to build early than to retrofit. HelloDevs builds all seven into the first version rather than the second — it is not gold-plating, it is the difference between a product you can charge for and a demo.
- Multi-tenancyOne system serving many customers whose data must never touch. Deciding this on day one is a design choice. Deciding it in month eight is a rebuild.
- Subscription billingNot just taking a payment. Plans, trials, upgrades, downgrades, proration when someone switches mid-cycle, and cancellation that does not lose data.
- Failed paymentsCards expire and decline constantly. Without dunning — retries, emails, grace periods — you lose paying customers to an expired card rather than a decision.
- Usage limits and plan gatesEvery feature needs to know which plan the user is on. Bolting this on later touches every screen.
- Roles and permissionsYour customer's admin, their team members, and your own support staff all need different access.
- OnboardingThe gap between signup and the first useful moment decides whether a trial converts.
- Analytics from day oneYou cannot improve retention you never measured, and the data you did not collect is gone.
Four kinds of SaaS product development
HelloDevs takes on these four. Anything outside them, we point you somewhere better rather than learn it on your budget.
What most MVPs get wrong
What most MVPs get wrong
HelloDevs has made most of these, on our own products, with our own money — that is why they are on the list. An MVP development company that agrees with everything in your brief is not helping. Expect the scope to get smaller in the first call.
- Building version two before version one has usersThe features you are certain about are the ones users ignore. Ship the narrow thing and let them tell you.
- Skipping validationThe most expensive mistake available. Twenty real conversations before any code costs nothing and changes the scope every time.
- Leaving billing until lastBilling is where the hardest bugs live. Build it early, on a real plan, and take a test payment in week two.
- Treating the free plan as an afterthoughtWhere the free tier stops decides your conversion rate. Design it deliberately.
- Ignoring onboardingA trial that does not reach a useful moment in the first session is a trial that expires.
- Building the admin panel lastYou will need to look up a customer, fix their data and extend a trial in the first week of real users.
- No way to know what users doAnalytics added later cannot report on the past.
Timeline, and what drives the cost
Timeline, and what drives the cost
Stated plainly so you can sanity-check anyone's quote, including ours. HelloDevs quotes a fixed price against a written scope — if we think the scope is bigger than the problem, we will say so before quoting rather than after.
- Typical timelinesA focused first version takes eight to sixteen weeks from scope to launch. Simpler products with a narrow feature set land nearer eight; real-time features, complex permissions or compliance requirements run longer. If an agency promises a complex product in three weeks, the scope has not been understood — if a simple product needs nine months, the brief is not tight enough.
- What actually delays a buildRarely the code. In order of how often we see it: unclear requirements, which add weeks before anything is written; decisions waiting on the founder, usually on design or scope; scope creep mid-build, the most expensive of the four; and third-party APIs behaving differently to their documentation.
- What drives the costFeature count, far more than hourly rates. Cutting a third of the features usually cuts closer to half the budget, because fewer features also means fewer screens, fewer permissions, fewer edge cases and less testing. The other multipliers: real-time features, compliance requirements, third-party systems, and whether the product has to work on mobile from day one.
After launch is the harder half
After launch is the harder half
Launch is the easy half. These are the things that arrive in the three months after, and the reason a first version has to be built to survive them. We will tell you what launch is going to cost you in attention, not just in money — nobody enjoys that conversation and everybody needs it.
- Support becomes a real jobEvery feature you ship generates questions. Products that ignore this drown quietly.
- Churn shows up around month threeNot month one. The first cohort leaving tells you more than any launch metric.
- Failed payments are constantExpired cards, bank declines, expired trials. Without a dunning flow this is silent revenue loss.
- Feature requests conflictYour loudest customer and your best customer usually want different things.
- Dependencies ageLibraries, APIs and platform versions all move. A product left untouched for a year is not stable, it is stale.
- The metric that matters changesSignups matter at launch, activation by month two, retention by month six.
What you get
What every HelloDevs SaaS quote covers
Every HelloDevs quote covers all of this. If an agency leaves any of it out, the cost comes back later as a change request.
- Scoping documentWhat gets built, what is deliberately excluded, and what it costs to run.
- Multi-tenant architectureDecided and documented before any feature work.
- Subscription billingWired to a real provider, with plans, trials and failed-payment handling.
- Admin view for your teamLook up a customer, fix data, extend a trial.
- Analytics instrumented at launchNot retrofitted.
- Automated testsOn billing and permissions, the two places bugs cost money.
- Deployment setupReleasing is routine, not an event.
- DocumentationHow it works, how to run it, how to change it.
- Source codeYours, in your repository, from the first commit, with accounts in your name.
- 30 days of post-launch fixesIncluded, not billed.
How a build runs
Five steps, with billing working by week two
Working software on a staging URL every week. Change your mind early and it costs nothing.
- Problem callYou tell us what you are building and who for. If the honest answer to "what have you validated" is nothing, we will say start there rather than take the money.
- Scope reductionWe cut the feature list with you before quoting. This is the step that saves the most money and the one founders resist most.
- Fixed quoteA written scope, a timeline, a price, and the monthly running cost. Not an hourly estimate that grows.
- Build in weekly cyclesWorking software on a staging URL every week, billing working by week two or three. Change your mind early and it costs nothing.
- Launch and watchThirty days of fixes included, and we look at activation and retention with you rather than declaring success at handover.
Our stack
Pure-play Shopify developers
We develop only for Shopify. No bloated frameworks, no visual page builders that degrade site performance, and no subcontracting. Just clean, hand-crafted code.
The Product Stack
Included because technical buyers ask, and because a vague answer here usually means the agency subcontracts the work. We choose boring where boring works — a stack your next developer already knows is worth more than one that impresses us.
- Next.js
- React
- TypeScript
- PostgreSQL
- Redis
- Stripe
- Socket.io
- lib/billing/stripe.ts01
- lib/tenancy/scope.ts02
- lib/permissions/roles.ts03
- app/api/webhooks/route.ts04
Boring Works
PostgreSQL for anything relational and multi-tenant, MongoDB where the shape genuinely suits it, Supabase where it saves weeks, Redis for caching and sessions.
const rows = await db.query(
sql,
[tenant.id]
);Stripe, Not a Rebuild
Stripe for subscriptions, plans, trials, proration and dunning. Shopify Billing API for products living inside Shopify — never rolled by hand.
custom-billing-engine.zip
Live & Native
Socket.io for live updates, presence and notifications. Flutter where the product needs an app alongside the web product.
ValidateShip
SaaS product development questions
- Eight to sixteen weeks from scope to launch for a focused first version. Narrow products land nearer eight weeks; real-time features, complex permissions or compliance requirements push it longer. HelloDevs gives you a date against a written scope rather than a range.
- Authentication, multi-tenancy, subscription billing, an admin view, and the one thing your product does that nothing else does. Everything else is version two. The features founders are most certain about are usually the ones early users ignore.
- Yes, completely, from the first commit. The repository is yours and every account — hosting, database, Stripe, domains — is in your name. If you stop working with HelloDevs, nothing about your product depends on us.
- Yes. Adding plans, migrating billing providers, fixing proration, or building the dunning flow that was skipped at launch are all things we take on separately. Billing work is directly tied to revenue, which makes it some of the highest-value work on a SaaS product.
- Multi-tenancy is one system serving many customers whose data must stay completely separate. You need it from the start — it is a foundational design decision, and retrofitting it later means touching almost every part of the product.
- Often yes, and we read the code before quoting anything. You get a written assessment saying whether finishing it is worth it or a restart is faster — sometimes it is the restart, and we would rather say that early than bill you to find out.
- Hosting, database, billing provider fees, email, monitoring and third-party services, and HelloDevs estimates all of it before you commit. A build quote with no running cost attached is half a quote, and the missing half arrives after launch.
- No. HelloDevs works on fixed-price scopes, which keeps the incentives clear on both sides. We would rather help you spend less than own part of the outcome.
- Thirty days of fixes are included. After that a maintenance retainer is available and never a condition of the build. The first three months after launch are when the real work starts, so plan for attention rather than assuming quiet.
- Then that is the first thing to do, and an MVP development company that skips past it is not helping you. Twenty conversations with potential customers costs nothing and changes the scope almost every time. HelloDevs will say this on the first call rather than take a build brief that is not ready.
- Yes — see AI integration services for what that involves. The short version: it works where there is a real retrieval or automation problem, and it is expensive theatre where there is not.
Tell us what you are building
Send the idea and who it is for. A developer at HelloDevs replies within one business day, including if we think the scope should be smaller.
Our talk
Tell us what you are building
Send the idea and who it is for. A developer at HelloDevs replies within one business day, including if we think the scope should be smaller.
