Fixed-price, fixed-scope
You know what it costs before we start. Surprise invoices, change-order theatre and mystery timelines — not here.
Accepting new projects · Q2 2026Ship the product your
Ship the product your
competitors said
was impossible.
Zentryx is a senior-only product studio. We design, engineer and launch revenue-ready mobile apps, web platforms and AI features — on fixed budgets, in weeks not quarters.
6 wksavg time to first release
100k+users served in production
5.0★average client rating
0projects dropped mid-way
Built with the tools trusted by top product teams
Hire a team that treats your product like their own.
Four promises we keep on every engagement — no small print, no surprises.
Senior-only team
Every line of code is written by someone with 5+ years shipping production apps. No junior pairings at senior rates.
Weeks, not quarters
A typical launch package ships to the App Store in six to ten weeks. We move in TestFlight builds, not PowerPoint.
Privacy-first by default
Offline-first storage, encrypted backups and GDPR / PDPL-ready defaults — no bolt-on privacy audits needed later.
End-to-end product engineering — one team, one bill.
From the first whiteboard sketch to App Store approvals and on-call rotation. No offshore hand-offs, no ghost PMs, no surprise invoices.
Mobile Apps
iOS + Android that feel native and ship revenue from day one. Offline-first, push-ready, AdMob / subscription monetised, App Store & Play Store approved.
- React Native 0.85+ (New Arch / Fabric)
- Flutter 3.x when it is the right call
- MMKV + SQLite + realm data layer
- Notifee, Firebase, AdMob, IAP, RevenueCat
Web & Dashboards
Marketing sites, SaaS dashboards and internal tools built with Next.js 15. Typed end-to-end, Lighthouse 95+, SEO-ready on launch day.
- Next.js 15 & React Server Components
- Design systems · Tailwind · Radix
- tRPC, Prisma, Drizzle, PostgreSQL
- Stripe / Paddle billing + auth
Cloud & Backend
APIs, event pipelines, auth, billing and observability. We keep infra boringly reliable with Terraform and ship safely behind feature flags.
- Node.js, Fastify, NestJS, Go
- AWS / GCP / Hetzner
- Postgres, Redis, Kafka, S3
- OpenTelemetry + Sentry + Datadog
AI & Automation
Practical LLM features that actually move metrics. RAG, agentic workflows, custom copilots, voice + vision — with evaluations and cost controls baked in.
- Anthropic Claude · OpenAI · Gemini
- Vector stores + retrieval pipelines
- Agent orchestration + guardrails
- Eval harnesses + token budgeting
Design & UX
Product design that respects both users and engineers. We ship design systems, not pixel museums — Figma libraries that become your codebase.
- Flows + prototypes in Figma
- Accessible & localised (RTL, multi-lang)
- Motion + haptics guidelines
- Design tokens → code pipelines
Security & Compliance
OWASP-aligned reviews, secrets hygiene, SAST/DAST, and app-store policy readiness. Privacy-by-default in every product we ship.
- Play / App Store policy audits
- SOC2 / GDPR / PDPL-ready stacks
- Pen-test coordination
- Incident response runbooks
Real apps. Real users. Real revenue.
A glimpse of products we've designed, built and launched. Tap a store badge to install the live build — each one is a full Zentryx engagement, soup to nuts.
Mobile · SMB POS
BillKit
Universal offline billing app for petrol pumps, medical stores, retail and services — with PDF / print / WhatsApp share and full inventory.
4 modesbusiness types
0msnetwork required
PDF+Printshare ready
Mobile · Lifestyle
Deen Companion
All-in-one Islamic utility: prayer times, Qibla compass, tasbeeh counter, and Ramadan tracker. Works fully offline with scheduled notifications.
100%offline capable
3 langsEN · UR · AR
±1 degQibla accuracy
Get it onGoogle PlayComing toApp Store
Mobile · Health
Hydration Companion
Smart water reminder with adaptive schedules, streak tracking, weekly insights, and widgets. Minimal, non-annoying nudges.
Smartadaptive reminders
WidgetsiOS + Android
<5MBinstall size
Get it onGoogle PlayComing toApp Store
Fixed-price packages. No hourly theatre.
Simple, honest packages that fit where you are — from validating a napkin sketch to running a live product with a retained Zentryx engineer.
Discovery Sprint
$4,500
one-time · 1 week
Validate your idea with a senior team — before committing to a full build.
- Stakeholder & user interviews
- Clickable Figma prototype
- Fixed-price engineering plan
- Technical architecture brief
- Honest go / no-go recommendation
Most popular
Launch Package
$18,000+
fixed price · 6–10 weeks
We build, polish and launch a production-grade app you can charge for on day one.
- Design system + product design
- iOS + Android (React Native)
- Backend, auth, payments & analytics
- App Store + Play Store submission
- Marketing site + docs included
- 30-day post-launch warranty
Retainer
$3,800
per month · 20 hrs
Keep a senior Zentryx engineer embedded in your team after launch.
- Bug triage + monthly maintenance
- New features on a predictable cadence
- OS version bumps + dependency hygiene
- Performance + crash-rate tuning
- On-call support window
Small team, senior-only, fixed-price milestones.
No ghost PMs, no offshore hand-offs, no surprise invoices. Clear milestones, Slack access, weekly demos.
- 01
Discover
Paid 1-week scoping sprint. We interview your users, audit the domain, and deliver a fixed-price engineering plan plus a clickable prototype. You can shop the plan to any agency — no lock-in.
- 02
Design
Flow-first prototypes in Figma, validated against real constraints: offline behaviour, RTL, edge-case states, accessibility, and store-review rules.
- 03
Build
Weekly TestFlight / Play Internal builds. Automated CI, type-safe contracts, feature flags. You see progress, not PowerPoint.
- 04
Launch
App Store / Play Store submission, marketing site, analytics, crash reporting, and an incident-response runbook — on launch day, not after.
- 05
Operate
Retainer support: bug triage, monthly maintenance, performance tuning, OS version bumps, and feature releases on a predictable cadence.
What founders say after we ship.
Verified feedback from real engagements across Asia, the Middle East, and Europe.
“They shipped our Play Store release in six weeks — two previous agencies had quoted six months. Clean code that our in-house team picked up on day one, and revenue arrived in week seven.”
“Zentryx treats on-call like a first-class feature. Our uptime went from embarrassing to invisible, and the AI copilot they shipped drives a third of our support load now.”
“The only team I’ve worked with that pushes back on scope when it actually matters. They saved us a quarter of wasted engineering by being willing to say no to the right things.”
About Zentryx
A product studio built on good taste and boring operations.
Zentryx was founded in 2023 by a working senior engineer who was tired of watching agencies ship slideware. We stay small on purpose — every client gets senior attention and a direct line to the people writing the code.
We believe in shipping software that your future self, and your future on-call engineer, will thank you for: readable, observable, offline-tolerant, and easy to delete. Fixed-price milestones, weekly demos, and a no-nonsense satisfaction promise on every engagement.
Book a discovery callPakistanUnited Arab EmiratesSaudi ArabiaUnited KingdomUnited StatesCanadaGermanyAustralia
2023founded
12+apps shipped
3continents served
0abandoned projects
Quick answers to common questions.
Still have something specific? Ask us directly.
How do engagements typically start?
We begin with a paid 1-week discovery sprint ($4,500) where we interview stakeholders, audit existing systems, and deliver a fixed-price engineering plan plus a clickable prototype. You can take that plan to any agency — no lock-in.
Do you work with solo founders or only funded startups?
Both. We have a SMB track for solo founders shipping their first app and a scale-up track for funded teams. The engineering bar is the same either way.
Where are you based and what timezones do you cover?
Zentryx is headquartered in Pakistan and serves clients across Asia, the Middle East, Europe, and the UK. We overlap working hours with GMT-2 to GMT+8 comfortably and offer async-first collaboration.
Which platforms and stacks do you specialise in?
Mobile: React Native (CLI, New Architecture) and Flutter. Web: Next.js 15 and SvelteKit. Backend: Node.js, Go, Postgres, Redis. Cloud: AWS, GCP, Hetzner. AI: Anthropic Claude, OpenAI, vector stores, agentic workflows.
Do you handle App Store and Play Store submissions?
Yes — end-to-end. We own metadata, screenshots, Play Data Safety, App Privacy, ASO, binary upload, and review responses. Your first submission is included in the launch milestone.
What does the Retainer cover after launch?
Starting at 20 hours per month: bug triage, monthly maintenance, performance tuning, OS version bumps, dependency hygiene, and small feature releases on a predictable cadence. Upgrade to full-time engagement any time.
Do you sign NDAs?
Yes — we routinely sign mutual NDAs before discovery. Request one at i.muhammad.ahmad443@gmail.com and we will return a signed copy within a business day.
What if I am unhappy with the first milestone?
Our Launch Package comes with a 30-day post-launch warranty and a satisfaction promise on the discovery sprint: if the plan does not meet your expectations, we refund it — no questions asked.
Have a product in mind? Let's build it together.
Free 15-minute intro call · Fixed-price quote within 48 hours · 30-day satisfaction promise on every engagement.
Let's buildHave a product in mind?
Have a product in mind?
Tell us about it.
Typical projects start at $4,500 for a scoping sprint and first milestone. Every serious inquiry gets a personal reply within one business day — often within a few hours.