Issue N° 047
Apr '26
Filed from
İstanbul ⇄ Remote
Team size
Two. Senior. Only.
Status
Accepting 2 new builds

Two senior devs, one & your startup — shipped in weeks.

Ugur & Murat build production-grade apps for startups. No juniors. No project managers. No agency overhead. You talk to the people writing the code — from idea to scale.

Next.js React Native Supabase NestJS Chrome Extensions Stripe + LemonSqueezy Claude API Postgres / pgvector Vercel / AWS / Railway WebSocket / Real-time

Trusted by 30+ startups across 6 continents.

UPWORK TOP 1% · 100% JSS · VERIFIED
Zing
ChurchBee
Poppin
This is HCD
YouNet
PredictHire
Auditional
Outfica
Trendin
PastorsLine
Coffict
Qonnect
N° 01 · Process

Three meetings from hello to shipping.

We don't do 8-week discovery decks. We do async loom walkthroughs, one video call a week, and a deployed preview URL before your coffee gets cold. Every week has a demo.

Step 0130 min · free

Discovery call.

We get on Zoom. You sketch what's in your head. We translate it into scope, stack, and a fair timeline — out loud, not in a proposal deck.

✓ Problem framingdone
✓ Scope + timelinedone
→ Fixed quote within 24hpending
Step 02week one

Build in public.

Day one: repo, CI/CD, preview URL. Day two: shipping. Weekly Loom demos, a shared Linear, and a direct line to the two people writing your code.

→ GitHub · PR #1open
→ Vercel previewlive
→ Loom · wk1 demo3:42
Step 034–8 weeks

Hand off & keep going.

We document the whole thing in a README a junior dev can follow. Most founders stay on a retainer — because the Duo that built it is the fastest at scaling it.

✓ README + architecture docdone
✓ Stripe + analytics wireddone
→ Monthly retainer (opt.)offered
N° 02 · Featured work

Startups we built & shipped.

A sampling. There are 30+ more on the ship log, from fishing AIs to Swiss NFC cards. Click the ones below for case studies.

[ hero screenshot · zingcoach.com ] 1M+ users · PSG partner
Health · AI2024 → now

Zing Coach

AI fitness coaching for 1M+ users. Full Webflow → Next.js rebuild, 20+ pages, computer-vision form tracking. Official partner of Paris Saint-Germain.

Full rebuildNext.jsTailwind
[ chrome ext overlay ] 500K+ ext users
Fintech · Extension2023 → 2025

Poppin

Chrome extension that embeds prediction markets (Polymarket, Kalshi) into any webpage. Co-founded + served as CTO for 1.5 years.

Chrome ExtNestJSCo-founded
SaaS2024

ChurchBee

Drag-and-drop newsletters for churches. Works inside existing church mgmt systems via Chrome extension. BeeFree integration.

Next.jsBeeFree
trending: solar flares
joined 🔥
427 online now
Built in 2 weeks
Real-time · AI2025

TrendinChat

Real-time chat rooms on trending topics with Grok AI integration. Zero → launched in 14 days.

SupabaseGrok API14 days
SaaS · Extension2023 → now

Auditional

Audition tracking for 2,000+ actors. 46,000+ auditions logged. Cross-browser one-click import.

SvelteFirebaseExt ×3
450 designers · 130 countries
Platform · Education2024

This is HCD

Independent home for Human-Centered Design. 364 podcast episodes, free courses, directory of 450+ designers across 130+ countries. Full platform remake.

Next.jsSupabaseSanity
AI agents + chat widget
AI · SaaS2025

YouNet

AI platform for building business solutions with agents. Plug & play chat widget, pre-built agents for support, social, SEO, data analysis.

ReactClaude + OpenAIRAG
N° 03 · What we deliver

MVP to scale, end to end.

Pick any two of the four. Or hand us the whole stack. Everything ships with a README a new engineer can follow, CI/CD, and a monitoring dashboard that actually works.

Practice 01
01

Full-stack apps.

Next.js, React, TypeScript on the front. Supabase or Firebase on the back. Real auth, real Stripe, real users by week three.

Next.js 16SupabaseTypeScriptTailwind
Practice 02
02

AI integration.

RAG with pgvector, Claude / OpenAI / Gemini orchestration, chatbots, custom agents, eval harnesses. AI that ships, not demo-ware.

Claude APIRAG · pgvectorLangChainEvals
Practice 03
03

Backend + infra.

NestJS APIs, websockets, microservices, queues. Deployed on AWS, Vercel, Railway or Hetzner. We migrate messes for a living.

NestJSPostgresDockerCI/CD
Practice 04
04

Browser extensions.

Chrome, Safari, Firefox, Edge. DOM injection, cross-origin messaging, content scripts. Our extensions serve 500K+ users.

Chrome MV3SafariFirefox500K+ users
0
Startups shipped
0K+
Extension users
0%
Upwork job success
0+ yrs
Production apps
N° 04 · Tech stack

Battle-tested. Opinionated.

We don't pick tools by trend. Every layer earns its spot by shipping something to production twice. If something newer wins, we'll tell you — and try it on project three, not yours.

↳ Frontend
ReactNext.js 16 React NativeSvelte TypeScriptTailwind shadcn/ui
↳ Backend
NestJSNode.js ExpressFastify WebSockettRPC GraphQL
↳ Database
PostgreSQLSupabase FirebasePrisma Redispgvector
↳ Infrastructure
AWSVercel RailwayHetzner DockerCI/CD
↳ AI layer
Claude APIOpenAI GeminiLangChain RAGEvals
↳ Payments & growth
StripeLemonSqueezy MolliePostHog SentryLinear
N° 05 · Meet the Duo

Two humans. Same Slack.

When you email DuoMake, one of two people reads it. When you open a PR, one of two people reviews it. That's the entire org chart. It's why we move fast and why you always know who you're talking to.

U
[ Ugur Kellecioğlu ] Upwork Top 1% · 100% JSS
Ugur KellecioğluTR · GMT+3

The extension & AI half.

5+ years shipping. Cross-browser extensions serving 500K+ users. RAG architecture, LLM orchestration, real-time systems. If it's tricky, Ugur already broke it on a previous project.

Chrome ExtRAGpgvectorNestJS
M
[ Murat Efe Doğan ] 30+ shipped startups
Murat Efe DoğanTR · GMT+3

The product & frontend half.

Next.js / Supabase product engineer. Turns Figma into pixel-perfect, SEO-friendly, fast-loading apps. Most-quoted review: "meticulous documentation, bug-free results."

Next.jsSupabaseStripeSEO
N° 06 · Reviews

What founders say.

Verified Upwork reviews from founders who paid us money and came back to pay us more. Every one is public.

⋆ 5.0
"Brought the Duo on to rebuild our SaaS dashboard. Performance improved 4×, customers noticed immediately. They think like product engineers, not just coders."
Laura M.CTO · Falley
⋆ 5.0
"Murat delivered ABSOLUTE pleasure — meticulous attention, excellent documentation, bug-free."
Jon H.Manager · ImmortalWS
⋆ 5.0
"Great work again from my new favourite coders. Can't recommend enough."
Philip L.Founder · PredictHire
⋆ 5.0
"Migrated Postgres → ClickHouse, added Kafka, moved infra to Hetzner. What used to crash now runs smoothly under heavy load."
Yalçın K.Founder · HyperMonk
⋆ 5.0
"Got the project back in 48 hours — original timeline was 7 days. DuoMake is by far the best team I've worked with on Upwork. Highly recommend."
Tre A.Founder · Auditional
⋆ 5.0
"Pro-active and eager to learn new tech to support our progress. Communication is the difference."
Kevin S.Founder · Falley
⋆ 5.0
"It is very fun to work with the Duo. Clearly experienced, pays attention to detail, got very involved with the project."
Axel G.Entrepreneur
⋆ 5.0
"Shipped iOS + Android ahead of schedule with real-time sync and push notifications. Clean TypeScript throughout."
Sophie R.Founder · studio
⋆ 5.0
"Pleasure working with DuoMake!"
Jonass S.CEO
N° 07 · FAQ

Questions, answered.

The same questions every founder asks on call #1. We'll send this page ahead of time so we can spend the call talking about your product instead.

What kinds of projects do you take on?

+

Full-stack web apps, SaaS platforms, AI-integrated products, and browser extensions. MVPs for early-stage startups through scale work on existing products. If it's a greenfield Next.js / NestJS / Postgres build, we're a perfect fit.

How long does an MVP take?

+

4–8 weeks for a focused MVP. 1–3 weeks for a feature addition or integration. You'll get a clear, fixed estimate within 24 hours of our discovery call — not a vague range.

Who actually writes my code?

+

Ugur and Murat. Nobody else. No junior devs, no outsourced contractors, no rotating account managers. You have direct Slack access to both of us for the entire project.

Do you keep supporting the product after launch?

+

Yes — most clients continue on a flexible monthly retainer. We know the codebase cold, so iteration after launch is 3–4× faster than onboarding a new team.

Can you add AI features to my existing product?

+

Regularly. LLM integrations (Claude, OpenAI, Gemini), RAG pipelines with pgvector, custom chatbots, AI-powered workflows. We also build the eval harnesses so it doesn't break silently.

What happens if you get hit by a bus?

+

Half-joking, fully serious. Every project ships with a README a new engineer can follow, documented architecture, CI/CD, and owned by you in your GitHub from day one. Both of us know every codebase; you're never a single point of failure.

How much does this cost?

+

MVPs typically $12–35k depending on scope; retainers from $4k/mo. We quote fixed-scope projects — no surprise invoices. If it's smaller, we'll tell you and often recommend someone else.

N° 08 · Let's build

Your next big thing — shipped.

Half an hour. No slides. Bring a rough idea or a half-finished Figma — by the end of the call you'll have a timeline, a fixed quote, and two senior devs who already sketched your stack.

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