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Keystone Technologies

Development & consulting

Software built to carry weight.

Keystone designs, builds and supports custom platforms (web and mobile apps, backend systems and AI integrations), and turns new ideas into working prototypes in days.

Start a projectSee our work

Core services

Four disciplines. One accountable team.

01

Custom app development

Web and mobile apps your customers and teams rely on every day.

  • →Customer portals and self-service apps
  • →iOS and Android apps (native or cross-platform)
  • →Internal tools that replace spreadsheets
  • →SaaS products from MVP to scale
02

Platform builds

The backend systems everything else stands on.

  • →APIs, data models and backend services
  • →Multi-tenant client platforms
  • →Integrations with payments, CRMs, ERPs and commerce
  • →Admin consoles, reporting and permissions
03

AI integration

Useful AI inside the products and processes you already have.

  • →LLM features: assistants, search and summarisation
  • →Document intake, classification and extraction
  • →Workflow automation with human review
  • →Evaluation, guardrails and cost controls
04

Technology consulting

Clear technical decisions from people who build for a living.

  • →Architecture and code reviews
  • →Technical due diligence
  • →Build-vs-buy and vendor selection
  • →Roadmaps, team structure and delivery process

Product & UX design

Flows, interfaces and prototypes, tested with real users before they're built.

Support & evolution

Monitoring, maintenance and a steady roadmap of improvements after launch.

05

Fast prototyping

A service that turns a product idea into a working prototype in days instead of weeks.

  • A clickable or working prototype, not a slide deck
  • A technical feasibility check on the risky parts
  • Something real to test with users or pitch to investors
  • A clear plan and estimate for the full build
Start a prototype
  1. 01

    Brief

    We pin down the one thing your prototype has to prove, and who it's for.

  2. 02

    Build

    Design and build at speed, with quick check-ins as it takes shape.

  3. 03

    Hand-off

    A working prototype you can demo, test with real users or take to investors.

Process

From first call to long-term support.

You see working software early and often, and you approve the scope before any build begins.

  1. 011–2 weeks

    Discover

    Workshops, system audit and a written scope with success measures.

  2. 021–3 weeks

    Design

    Architecture, data model and clickable prototypes, approved by you.

  3. 03Iterative

    Build

    Two-week cycles with demos and working software at every checkpoint.

  4. 04Planned

    Launch

    Testing, data migration, release and handover documentation.

  5. 05Ongoing

    Support

    Monitoring, fixes and improvements under a clear support plan.

Engagement models

Work with us the way that suits the work.

Fixed-scope project

Well-defined builds

A clear scope, milestones and price agreed up front. Projects start from ₹40,000, though the final price depends heavily on the app.

Dedicated product team

Ongoing products

A cross-functional Keystone team working as an extension of yours, month to month.

Advisory retainer

Leadership & decisions

Senior technical guidance on call: reviews, planning and hiring support.

Toolkit

Proven, boring-in-a-good-way tech.

Frontend
Next.js · React · TypeScript · Tailwind
Mobile
React Native · Swift · Kotlin
Backend
Node.js · Python · PostgreSQL · Redis
Cloud
AWS · GCP · Vercel · Docker
AI
LLM APIs · retrieval · evaluation
Commerce
Shopify · payments · CRMs · ERPs

Need the work done, not just the software?

Agent as a Service puts a trained AI agent inside your systems to run the operational work.

Explore Agent as a Service

Questions

Before you start a project.

Or email info@keystonetech.si.

Who owns the code you write?
Ownership of deliverables and source code is set out plainly in your signed project agreement, alongside any licences for pre-existing tools or open-source components. Nothing is left ambiguous.
Can you work with our existing team and codebase?
Yes. Much of our work extends or stabilises existing systems. We start with a review so we understand what's there before proposing changes.
How do you price projects?
Projects start from ₹40,000, but the price depends heavily on the app: its features, platforms and integrations. After a discovery call we send a proposal with scope, milestones and a fixed price, so you know the cost before any build begins.
Do you support what you build after launch?
Yes. We offer support and evolution plans covering monitoring, maintenance and ongoing improvements, with the commitments defined in your agreement.

Start a project

Tell us what you need built. We'll scope it properly.

A few details about your business and the project, and we'll come to the first call prepared.

What happens next

  1. 01

    Share your brief

    Three short steps, about two minutes. No sales script on the other end.

  2. 02

    Discovery call

    We map the workflow, the systems involved and what success should look like.

  3. 03

    A scoped proposal

    You get a pilot scope, plan and price to approve before any build starts.

Step 1 of 3

What best describes your business?

This shapes which agents and examples we bring to the call.

Takes about two minutes

Tell us what's slowing your team down. We'll show you what we'd build.

No pitch deck. A direct conversation about your systems, your workflows and what it would take to fix them.

Book a callAbout Keystone