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Custom SaaS & Web Development

We build custom SaaS for the global economy.

Engineering high-performance platforms, internal tools, and AI-powered products that scale with your business.

kore-engine.ts
// Klaps · Orchestration Engine
export async function handleWebhook(event) {
const tenant = await resolveTenant(event);
const engines = getEngines(tenant.rules);
return Promise.allSettled(
engines.map(e => e.run(event)
);
}
Engine running · 3 tasks dispatched
30+
Custom apps shipped
100%
Source code ownership
4–16 wks
Typical delivery range
99.9%
Avg uptime SLA

Our Engineering Stack

Next.jsReactTypeScriptSupabasePostgreSQLVercel
The problem

Off-the-shelf software is built for everyone. Not for you.

As your business scales, generic tools become bottlenecks. We build custom software that models your unique business rules, giving you a competitive edge.

Tool sprawl

7 SaaS tools doing the work one custom app could handle end-to-end.

Vendor lock-in

Platform pricing hikes and feature caps you have no control over.

No custom logic

Off-the-shelf software can't model your unique business rules.

Poor UX for your team

Tools built for everyone fit no one — your team works around them.

What we build

Full-stack engineering focused on performance.

From architecture to deployment, we build software that is fast, secure, and ready to scale.

Custom SaaS Platforms

Launch your own subscription-based product with a robust multi-tenant architecture.

  • Multi-tenant data isolation
  • Subscription billing integration
  • Custom RBAC & team management
  • Admin & analytics dashboards

Global E-Commerce Tools

Custom Shopify apps and middleware designed to handle complex global logistics.

  • Native Shopify API integration
  • Automated currency & tax rules
  • Global logistics workflow
  • Warehouse management sync

Internal Dashboards

Optimize your operations with purpose-built internal tools and automated workflows.

  • Custom data visualization
  • Operational workflow automation
  • Legacy system integration
  • Real-time monitoring

AI & Automation

Integrate LLMs and custom AI agents to automate high-volume manual processes.

  • RAG & vector DB pipelines
  • Custom AI agent orchestration
  • Automated content generation
  • Intelligent classification

What kind of apps
do we build?

SaaS Platforms

Multi-tenant subscription products

Auth, billing, usage limits, team management — the full platform layer so you can focus on your core feature.

  • Subscription billing (Stripe)
  • Role-based access control
  • Usage analytics dashboard
Internal Tools

ERPs, CRMs & ops dashboards

Replace 5 spreadsheets and a Google Doc with one fast, purpose-built internal tool your team actually uses.

  • Custom data models
  • Workflow automation
  • Role-based views & exports
AI-Powered Apps

LLM integrations & automation

Add AI reasoning, document processing, or generative features into your existing product or build from scratch.

  • RAG pipelines (pgvector)
  • Groq / OpenAI integration
  • Automated classification workflows
How we work

Shipped in phases,
never in a black box.

1
Phase 1

Discovery & Scoping

We break down your requirements into a tight technical spec — user stories, data models, API contracts, and a phased delivery roadmap before any code is written.

2
Phase 2

Architecture & Design

System architecture diagram, database schema, and full UX wireframes. You approve before development starts — no surprises mid-build.

3
Phase 3

Iterative Development

Two-week sprints with a staging URL you can test at the end of every cycle. You see progress constantly, not just at the end.

4
Phase 4

QA & Security Review

Full test coverage, security audit (auth, RLS, rate limiting), performance profiling, and cross-browser/device testing.

5
Phase 5

Deployment & Handoff

CI/CD pipeline to production on Vercel/Supabase. Full documentation, codebase walkthrough, and optional training session for your team.

Deliverables

Production-ready software that you own.

You receive a fully functional platform with complete source code ownership. No vendor lock-in — everything we build is yours.

  • Production-ready Next.js codebase
  • Database schema & RLS policies
  • API documentation & contracts
  • Deployment to Vercel & Supabase
  • Maintenance & scaling handbook
  • CI/CD pipeline with automated deployments
  • Security audit report & RLS policy documentation
  • Full test suite (unit + integration)
“

We handed Klaps a 60-page spec for our logistics SaaS. They delivered a production-ready multi-tenant platform in 11 weeks — with documentation so clean our own engineers could extend it from day one.

J
CTO
B2B Logistics SaaS · Seoul
Pricing

Transparent, fixed-fee engineering.

No hidden costs or hourly surprises. We scope your project and deliver a fixed-price roadmap. Every project starts with a scoping session to define deliverables and budget before a single line of code.

Starting at $10k per project

Every project includes
  • Full-stack Next.js + Supabase architecture
  • UX/UI design system (Figma → production)
  • Authentication, auth roles & RLS policies
  • REST or GraphQL API with documentation
  • CI/CD pipeline (GitHub Actions + Vercel)
  • Full test suite & QA sign-off
  • Source code handoff & team training
Let's build

Build your next big idea with us.

Book a 30-minute scoping call to discuss your technical requirements.