Amsten / Solutions / Custom Software

Engineering — 02

Bespoke software,
built end-to-end.

From system architecture and API design to polished web and mobile interfaces, we build custom software products and see them through to production and beyond.

Repository
Pull Requests
CI Pipelines
API Docs
Releases
All checks passed
feat: add checkout API endpoint — merged to main
3m ago
Deployed v2.4.0 to production
18m ago
Test suite: 412/412 passing
22m ago

Why it matters

Off-the-shelf tools bend your business to fit them.

01

SaaS tools plateau fast

Generic platforms work until your workflow needs one thing they don't support — then you're stuck waiting on a roadmap you don't control.

02

Technical debt compounds

Fast-shipped MVPs often calcify into fragile systems nobody wants to touch. Every new feature gets slower and riskier to add.

03

Ownership matters

Renting a workflow through a third-party tool means you never own the thing that runs your business. Custom software is yours.

What we provide

One team for the full product lifecycle

Web & mobile

Interfaces people actually enjoy using

We build fast, accessible web and mobile applications with React, Next.js, and React Native — designed with your users in mind, not just your feature list.

  • Responsive web apps (React, Next.js)

  • Cross-platform mobile apps (React Native)

  • Progressive web apps with offline support

GET /api/v1/orders/:id
200 OK · avg 42ms
{
"id": "ord_9f21",
"status": "fulfilled",
"total": 4820
}

APIs & architecture

A backend built to scale, not just to ship

We design REST and GraphQL APIs, data models, and system architecture with your scale in mind — documented clearly enough that any engineer can pick it up.

  • RESTful and GraphQL API design

  • Database schema design and query optimisation

  • API documentation your team can actually use

Integrations

Your software, connected to everything else

Payment processors, CRMs, ERPs, messaging platforms — we integrate the third-party systems your business already depends on, cleanly and reliably.

  • Payment gateways (Stripe, Razorpay)

  • CRM & ERP integrations (Salesforce, HubSpot, SAP)

  • Webhooks and event-driven syncing

Stripe · Connected
HubSpot · Connected
Slack · Connected
API response time (p95) −64% after review

Optimisation & debt

Make what you already have faster and safer

Not every engagement starts from zero. We audit existing codebases, fix performance bottlenecks, and pay down technical debt without a risky rewrite.

  • Codebase audits and performance profiling

  • Incremental refactors — no risky big-bang rewrites

  • Test coverage and CI pipeline hardening

How we build it

From requirements to production, in sprints

1.0 Scope

Define requirements and system boundaries

2.0 Design

Architecture, data model, and API contracts

3.0 Build

Two-week sprints with working increments

4.0 Ship

Deploy, document, and hand off cleanly

Tools we work with

Proven technology, applied to your product

React & Next.js

Web application frontend

React Native

Cross-platform mobile apps

Node.js & PostgreSQL

Backend services & data

GraphQL & REST

API design & contracts

Stripe & Razorpay

Payments integration

Jest & Playwright

Testing & CI pipelines

Have a project in mind?

Tell us what you're building — we'll scope the right team and timeline.

Talk to us →