KMT.Development

Custom business platforms.

When your business doesn't fit an existing tool, we build the platform that fits your business. Production-grade multi-tenant architecture, solid PostgreSQL database, interface designed for daily operations. Stack Next.js 16 + Supabase + Vercel, continuous deployment, monitoring and alerting included, code delivered to your GitHub repository.

Three pillars of a business platform that lasts

Multi-tenant architecture built to scale

One codebase, multiple organizations. PostgreSQL Row Level Security for data isolation, per-tenant configuration, customizable branding, granular role permissions. The platform grows with you, no rebuild needed.

Modern stack, no technical debt

Next.js 16 with Server Components and Server Actions, Supabase for database and auth, Vercel for edge deployment, end-to-end strict TypeScript. Documented code, integration tests on critical flows, Sentry monitoring included.

Business integrations out of the box

Stripe Connect for multi-vendor payments, Twilio for SMS and WhatsApp, Resend or Postmark for transactional email, CRM (HubSpot, Pipedrive), accounting (Pennylane, Sage), e-signature (Yousign), maps (Mapbox).

Typical use cases

Multi-tenant SaaS for SMBs

Owners who want to pilot operations from one screen: dashboard, inbound requests, scheduling, communications, 360 client tracking. Activatable client by client, à la carte modules, per-tenant branding. Real example: KMT Pilot.

Two-sided B2B/B2C marketplace

Matching providers and clients, Stripe Connect payments with platform fee, dispute management, real-time chat, notifications. Full workflow from request to intervention. Real example: ElectroCall.

Operations back-office

Teams juggling Excel, calendars and email. Unified platform with client management, multi-resource scheduling, quotes and invoices, automated communications, reporting. Real example: JB Service.

Internal app for leadership

Owners wanting a piloting tool tailored to their image, integrated to their stack. Supabase connection to your existing PostgreSQL or data warehouse, configurable dashboards, accounting exports, business alerts.

What we deliver

  • Full functional scoping with your teams and data schema
  • Stack Next.js 16, Supabase, Vercel deployment, code on GitHub
  • Multi-factor auth, Stripe Connect payments, email/SMS notifications
  • Multi-tenant architecture with Row Level Security and granular permissions
  • CRM, accounting, mapping, e-signature integrations as needed
  • User documentation, technical docs and team training
  • Corrective maintenance and evolutions on monthly subscription

Tech stack

  • Next.js 16 — App Router, Server Actions, streaming
  • TypeScript strict — DB → UI end-to-end types
  • Supabase — PostgreSQL, Auth, Storage, Realtime, Edge Functions
  • Stripe Connect — multi-vendor payments, subscriptions, invoices
  • Vercel — preview deployments, edge runtime, ISR
  • Tailwind v4 + shadcn/ui — centralized design system
  • TanStack Query / SWR — cache and revalidation
  • Resend / Postmark — transactional email and templates
  • Mapbox / Google Maps — mapping and geolocation
  • Sentry / Vercel Analytics — monitoring and alerting

Delivery method

01

Functional scoping and data model

Workshops with your teams to map usages, roles, data flows. Costed PostgreSQL relational model, schematized user journeys. Technical plan before development.

02

Interactive mockups and validation

Figma wireframes on critical screens, journey validation, design system built for the platform. You see what you'll receive before the first line of code.

03

Weekly sprint development

1-week sprints with Vercel preview on every commit. You access the test version in real time, test flows, surface adjustments. No tunnel effect.

04

QA, training and production

User acceptance testing in preview, team training, existing data migration, gradual production rollout. Support included for the first weeks.

Who it's for

SMB owners juggling Excel files who want a unified multi-user tool. Operations teams needing a back-office truly fitted to their craft. SaaS founders at MVP stage wanting a modern stack with no technical debt. Marketplaces wanting to industrialize matching, payments and service tracking.

Industries served

  • Concierge services, hospitality, vacation rentals
  • Service trades (cleaning, repair, maintenance)
  • Liberal professions and training firms
  • Distribution, logistics, retail
  • HR firms and staffing agencies
  • B2B and B2C marketplaces

Frequently asked questions

+What's the difference vs. an off-the-shelf SaaS?

Off-the-shelf SaaS forces you into its mold. A custom business application matches your process, integrates your business rules, talks to your existing tools. Initial cost is higher but ROI accrues over years through operational gain.

+How long to ship an MVP?

A functional MVP usually ships in 6 to 12 weeks, with weekly sprints and weekly Vercel preview deliveries. MVP scope defined upfront to ship a testable product with first users.

+What stack do you use?

Standard stack: Next.js 16, strict TypeScript, Supabase (PostgreSQL + Auth + Storage + Realtime), Vercel, Tailwind. Modern, widely adopted, documented stack. No lock-in: any Next.js developer can take over.

+How does maintenance work?

Corrective and evolutive maintenance on monthly subscription: continuous monitoring, security updates, user support, priorities defined with you. You retain 100% source code ownership.

+Is my data secure?

Yes: PostgreSQL Row Level Security for data isolation, encryption at-rest and in-transit, multi-factor auth, access logs, automatic backups. Supabase hosting is SOC 2 certified. Documented GDPR compliance.

You have a specific project in mind?

Describe it. I'll get back to you within twenty-four hours with concrete feedback.

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