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JXSFLOW

Software that fits.

Custom applications, integrations and internal tools — cleanly built, documented and handover-ready.

What we actually build

Custom web apps

Your own products or internal applications — yours to own. Auth, roles and audit logs are standard, not add-ons. The codebase stays with you.

Integrations & APIs

We connect what you already run — CRM, ERP, accounting, marketing tools. Clean data pipelines, webhooks and APIs instead of manual handovers.

Internal tools & dashboards

Lean admin panels, ops dashboards and KPI views. Exactly the surface your team needs day-to-day — not an overloaded off-the-shelf product.

How we work

01

Discovery

1–2 days

We clarify requirements, user flows and success criteria. The stack decision lands at the end — fitted to your reality, not to the last conference.

Deliverable: Scope, success metrics and stack recommendation, in writing.

02

Architecture & prototype

1–2 weeks

The data model is set, the key flows are clickable. A deployable skeleton on staging — visible early, correctable early.

Deliverable: Clickable prototype on staging plus an architecture sketch.

03

Iterative development

4–12 weeks

Releases every two weeks. Real users test on staging, and we adjust based on what we see — not based on what's in the spec.

Deliverable: Working application in production, extended step by step.

04

Handover & operations

ongoing, optional

Documentation, runbooks and onboarding for your devs. You take over yourself — or we stay on for operations, monitoring and further development.

Deliverable: Full documentation, runbooks and a clear handover or operations plan.

The stack we work with

Boring tech, LTS versions, no hype. We pick tools that will still be maintainable in five years — not the ones that will sink in next conference season.

Frontend

  • Next.js 16 (App Router)
  • React + TypeScript strict
  • Tailwind v4
  • Server Components by default

Backend & data

  • Node.js, Postgres
  • Drizzle or Prisma
  • REST or tRPC
  • Versioned migrations, never manual

Auth & identity

  • Clerk or Auth.js
  • Custom IdP when needed
  • Roles and audit log built in
  • SSO via SAML or OIDC

Hosting & infrastructure

  • EU region, GDPR-compliant
  • Self-hosted via Caddy + Docker
  • Cloudflare for edge and protection
  • Backups and monitoring from day one

Quality & operations

  • TypeScript strict, ESLint, Prettier
  • Automated tests for critical paths
  • CI/CD via GitHub Actions
  • Runbooks for every deployment

Frequently asked questions

How are you different from a classic agency?
We build for maintainability and document as we build. Handover is the default, not an upcharge. You aren't tied to us after the project — unless you want to be.
What if we want to take the project in-house later?
A clean codebase, full documentation and onboarding for your devs are part of the delivery. We pick stack and tooling so your developers can keep working without specialist knowledge.
What does a typical custom application cost?
Concrete numbers come after discovery. Effort depends on scope, stack choice and how much of your existing systems needs to be wired up. You get a written estimate with a fixed price per phase or time-and-materials — decidable per phase.
Which stack decisions do you make?
Boring tech and LTS versions. Postgres rather than the next NoSQL fad, Next.js and TypeScript rather than inventing our own frameworks. We're choosing for your next five years, not for our next conference talk.
What happens if something goes wrong in production?
Monitoring and alerting are built in, not bolted on. Every deployment has a runbook. On-call and response times are available as an add-on — or you take them on yourself if your team can carry it.

What tool would make your team's day easier?

Book a consultation