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Your Stockholm SaaS Needs React That Ships Revenue, Not Just Features

If you're a Swedish product team watching Vercel bills climb while conversions flatline, you're running React wrong.

We build Next.js applications for Stockholm fintech and SaaS teams where slow page loads and broken conversion funnels are costing you paying users. Our London-based engineers work CET-aligned hours, ship with sub-2s LCP targets baked into every deployment, and test Swish and Klarna flows in sandbox before anything touches production.

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Next.js Product Engineering

Next.js product engineering is the practice of building server-rendered React applications architected around measurable business outcomes: conversion rates, Core Web Vitals scores, and audit-ready data handling. For Swedish SaaS and fintech teams, this means integrating Supabase row-level security for GDPR compliance, optimising for Nordic payment providers, and structuring code so your internal team can own it after handoff.

What is holding your current website back?

Common gaps we find in nearly every audit.

Your Vercel spend scales faster than your active user count because nobody audited which routes actually need edge rendering versus static generation.
Risk: Infrastructure costs compound monthly while the performance gains you paid for never materialise in your Core Web Vitals dashboard or your signup funnel.
Swish and Klarna integrations were tested manually in production by a contractor who no longer answers Slack messages.
Risk: A single edge case in the payment flow surfaces during a high-traffic campaign and you have no sandbox coverage to diagnose it quickly.
Your React codebase has no consistent data-fetching pattern, mixing client components, getServerSideProps, and useEffect calls for the same data types.
Risk: Every new feature takes twice as long to ship because engineers spend half the sprint reconciling hydration errors and stale cache states.

How We Build This Right

Every safeguard, built in from Day 1.

GDPR-Ready Data Access

Supabase row-level security policies are configured so user data is scoped at the database layer, not just in application logic. Every policy is documented and queryable for audit trails required under GDPR Article 30.

Payment Sandbox Verification

Swish and Klarna flows are validated in their respective sandbox environments with documented test cases covering decline codes, partial refunds, and timeout scenarios before any release to production.

Environment Isolation

Preview, staging, and production environments are separated with distinct Supabase projects and environment-scoped secrets, eliminating the risk of test data or credentials crossing into live systems.

What We Build

Purpose-built features for your industry.

Core Web Vitals as a Delivery Requirement

Sub-2s LCP is treated as a hard acceptance criterion on every page template, not a post-launch optimisation. We instrument real user monitoring from day one and tie rendering strategy decisions directly to field data, not lab scores.

CET-Aligned Engineering Hours

Our London team operates on a schedule with full overlap into Central European Time, meaning Stockholm product managers get same-day responses during their working hours without asynchronous lag compressing sprint cycles.

Structured Caching and Data-Fetching Patterns

We establish a single, documented approach to server components, client components, and cache invalidation across your codebase before writing the first feature. This removes the hydration errors and stale state issues that slow down subsequent engineers.

Vercel Spend Audit and Route Architecture

We review your existing deployment configuration to identify which routes are over-provisioned for edge rendering and which static pages are incorrectly triggering serverless function invocations, then restructure accordingly.

Our Development Process

From discovery to launch. Quality at every step.

01

Codebase and Infrastructure Audit

1 week

We review your existing Next.js application, Vercel configuration, and Supabase schema to identify the specific rendering mismatches, payment integration gaps, and data-fetching inconsistencies creating friction. You receive a written findings document before we write a single line of code.

02

Architecture and Payment Integration Planning

1 week

We produce a route-level rendering strategy, a Supabase RLS policy map, and a Swish and Klarna sandbox test plan aligned to your actual user journeys. This document is reviewed with your product and engineering leads before sprint planning begins.

03

Iterative Build with Performance Gates

2 weeks

Features are shipped in two-week cycles with Core Web Vitals checks and payment sandbox validation required before each deployment merges to the main branch. CET standups keep your Stockholm team in the loop without requiring async catch-up.

04

Handoff, Documentation, and Monitoring Setup

1 week

We deliver annotated component documentation, runbooks for Supabase policy changes, and a configured real user monitoring dashboard so your internal team can maintain and extend the codebase without depending on us for ongoing changes.

Social Animal

Ready to discuss your your stockholm saas needs react that ships revenue, not just features project?

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Frequently Asked Questions

No. Our studios are in London (HQ) and Los Angeles. We've worked with Stockholm-based fintech and SaaS teams remotely, and the setup works well -- London is one hour behind CET, so we're online together for the full Swedish working day. Communication runs through Linear, Slack, and weekly video syncs. We don't pretend to be local, but the timezone math means you won't feel like we're offshore either.
London is GMT/BST, which puts us one hour behind Stockholm. In practice, our team is available 09:00-18:00 CET during your working day. Daily async standups go out by 09:30 your time. Video calls are scheduled mid-morning or early afternoon CET. Our LA studio adds a second shift for anything that needs US-hours coverage -- useful if you're running a SaaS with American customers too.
Yes. We set up Next.js middleware-based locale routing so Swedish and English (or additional locales) each get their own URL prefix, correct hreflang tags, and per-locale sitemaps. We don't do translation -- you'll provide the Swedish copy or we can coordinate with your translator -- but the technical i18n architecture is something we've done many times and it won't break your SEO.
Stockholm fintech products tend to be data-dense, auth-heavy, and subject to financial regulation. Next.js server components let you run payment logic server-side without exposing it to the client. Supabase gives you Postgres with row-level security -- meaning you can enforce data access rules at the database level, which auditors and compliance teams actually understand. It's a stack that scales without requiring a massive DevOps team, which matters when you're a 15-person startup burning through a Series A.
Yes. We've integrated Swish for Business (via their API) and Klarna Checkout/Payments in Next.js apps. We also work with Stripe Connect for marketplace-style flows. Each integration gets tested against sandbox environments before going live, and we build webhook handlers with idempotency keys so you don't end up with duplicate charges -- a surprisingly common bug in payment integrations.
Most projects fall between SEK 120K and SEK 2M depending on scope. A focused MVP -- say a payment dashboard with auth and one integration -- runs about 8-10 weeks and lands in the lower range. A full SaaS platform with multiple payment providers, admin panels, and compliance features can take 14-20 weeks. We scope everything upfront with a fixed-price option available after the architecture phase, so there are no surprises.
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Need enterprise scale?

200+ employee company? Complex multi-tenant, auction, or multi-location requirement? We have a dedicated enterprise capability track.

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