Software Studio — Asia-Pacific

Stay low. Move fast.
Build everything.

Ex-military. Eight companies built and sold. Now building AI-powered software products — fast, lean, and built to generate revenue. No agencies. No meetings. Just shipped product.

Submit your idea → See live builds
8
Companies built & sold
29
Active Vercel projects
4
Live SaaS products
0
Meetings required
Next.js Supabase Vercel Claude AI PostgreSQL Stripe TypeScript Edge Functions Resend REST APIs SEO Architecture Auth & Payments Next.js Supabase Vercel Claude AI PostgreSQL Stripe TypeScript Edge Functions Resend REST APIs SEO Architecture Auth & Payments

No account managers. No Monday standups. No Jira tickets.
No 90-day onboarding. No six-figure retainer. No corporate theatre.
One developer. One stack. One focus: your product, shipped.

Why I build

I've built eight businesses. Sold one. Started from nothing every time.

I know what it's like to have an idea and no budget. To compete against companies with ten times your headcount. To feel like the system isn't built for you.

It isn't. So I build tools for people who build anyway.

Founders. Sole traders. Small teams with big conviction. The ones who'd rather ship than pitch. Who measure success in revenue, not rounds raised.

I want your software to make you money — so you can spend your time on the things that actually matter.

That's why Sierra21 exists.

● Live builds — Active now
Products in market. Evidence, not claims.
Live SaaS products generating real revenue, plus active builds in development. Some projects remain classified.
sierra21 — build monitor
$ s21 status --live
// querying active deployments...
→ 29 Vercel projects | 4 SaaS products live | 3 Stripe accounts active
→ paying users: week 1 on first launch | uptime: 99.9%
→ last deployment: today
Live — paying users
NHS Decoder
AI explains NHS letters in plain English. Photo-first UX for 65+ audience. Facebook ads live from day one. Paying users within the first week.
Next.jsClaude AISupabaseStripe
Live — active revenue
Decode My Lease
Lease intelligence for UK tenants. 307 live SEO pages, four revenue streams including affiliate and Stripe. Pre-launch push running now.
Next.jsSEOStripeResend
Live — intel reports open
Planning Decoder
AI-powered planning intelligence for UK landowners. Surfaces committee decisions from archives standard portals can't reach. £249 bespoke reports.
Next.jsClaude AIStripe207 councils
Live — deployed in one session
Redundancy Decoder
Interactive statutory redundancy calculator. 2026 verified figures, 13 guide pages, full SEO architecture. Conceived and deployed in a single working session.
Next.jsSEOSupabase
In development
NurseryDesk
AI-powered operations platform for the UK childcare sector. Multi-site management, compliance, parent communications. Sector-vertical SaaS.
Next.jsClaude AISupabase
Additional builds
+ 24 more projects
Travel content networks, QR showcase platforms, secure comms demos, client builds. Some projects remain classified by client agreement.
VariousActiveVercel
Capability matrix
Full spectrum. No handoffs.
Architecture to deployment. One person. No sub-contractors, no account managers, no "let me check with the team".
⚡

Full-Stack Development

Next.js, React, Node.js, PostgreSQL, REST APIs. From database schema to deployed product.

🤖

AI Integration

Claude, OpenAI, edge functions, custom prompting. AI as a product feature, not a gimmick.

🎨

UI / UX Design

Product design, conversion-first layouts, mobile-first. Design that serves the MWA.

📈

SEO Architecture

Programmatic SEO, sitemap generation, metadata, content strategy. Built to rank from day one.

☁️

DevOps & Cloud

Vercel, Supabase, edge functions, webhooks, CI/CD. Infrastructure as a product advantage.

💳

Payments & Auth

Stripe payment links, webhooks, Supabase Auth, RLS policies. Revenue infrastructure, done right.

29 Vercel projects  ·  3 Stripe accounts live  ·  4 SaaS products in market  ·  all systems operational
What we build
Build. Rescue. Advise.
Three tracks. One developer. Delivered at a pace that'll make your current agency nervous.
Build

Product Development

Websites, SaaS platforms, AI tools, client portals. Fixed scope. Fixed price. Live in weeks.

⚡ From £250 — micro builds same day
Rescue

Takeover & Fix

Stuck with a broken build, a ghost developer, or an agency bleeding you dry? We take over, fix it, and hand it back working.

⚡ From £500 — scoped on inspection
Advise

Strategy & Architecture

Paid deep-dive on your idea — market fit, technical architecture, build plan, honest verdict. Walk away with a blueprint.

⚡ From £500 — delivered in 48hrs
Global
English-speaking world
8
Companies built & sold
100%
Delivery rate
<7d
Idea to working demo
Start here — takes 2 minutes
Submit your idea. Get a straight answer.
Five quick questions. No calls. No pitch decks. You'll get a scope, a price, and a realistic timeline.
⚡ Quick brief
5 questions • 2 minutes
Step 1 — Project type
What are you looking to build?
SaaS Platform
Website / Landing Page
AI-Powered Tool
MVP / Prototype
Rescue a broken build
Strategy / Architecture advice
Something else
⚡ Your selection shapes every question that follows.
Step 2 — Users
Who are the end users?
B2B — Businesses
B2C — Consumers
Internal team
Marketplace (both)
Step 3 — Scope
Describe your idea in a few sentences.
Step 4 — Timeline
What's your ideal timeline?
ASAP — days
Weeks
1–2 months
Flexible
Step 5 — Contact
Where do we send the response?
⚡ If the idea has legs, you'll get a scope, timeline, and fixed price. No ghosting.

Brief received. We're on it.

You'll hear back with a fixed-price scope and timeline, or honest feedback on why it's not a fit. No ghosting. No silence.

The builder

James Williams. Ex-military. Eight companies built. One exit. Still building. Military-grade discipline applied to software — structured execution, zero waste, relentless forward momentum.

If you're a founder with conviction but no CTO, I'm your build partner. If your agency is bleeding you dry for basic changes, I'll fix that. If you've got an idea but no clue where to start — that's exactly what I do, every day.

You'll probably never meet me. This is about your software, not my face on a LinkedIn carousel.

Based in Bangkok, Thailand
Serves founders & SMBs globally
Async-first — timezone is never a barrier
Contact

Got an idea? Let's see if it has legs.

Submit your idea and you'll get a straight answer — a scope, a price, and a realistic timeline. If it's not a fit, we'll tell you. No ghosting. No invoices for "discovery".

Submit your idea james@sierra21.com
sierra21 — build console