01
Audit
We look for the workflow where text, documents or judgement are the bottleneck — and write down the ones AI would only pretend to fix.
Produces
- Use-case map
- A skip-list (what we won't AI)
- One sized first bet
We Design & Build Products That Drive Results.
Mobile apps, modern web platforms and intelligent AI systems — engineered, shipped and maintained by one senior studio.
Flutter-first product studio in Chattogram: apps, web platforms, AI systems, branding and SEO engineering — verified work, transparent process.
3 apps
Own products live on Google Play
2019
Building since
Bangladesh
Based in
Shipped & live — then the blueprints
AI Automation CopilotAI
AI Chatbot SuiteAI
ShikkhaOS — School Management SystemBusiness
Pathshala — Online Learning PlatformEducation
Jhotpot — E-commerce SuiteE-commerce
Sastho — Doctor Appointment & Health CompanionHealth
PoraShore — Travel Booking PlatformTravel
Dokti — Booking & Reservations PlatformBooking
AI Automation CopilotAI
AI Chatbot SuiteAI
ShikkhaOS — School Management SystemBusiness
Pathshala — Online Learning PlatformEducation
Jhotpot — E-commerce SuiteE-commerce
Sastho — Doctor Appointment & Health CompanionHealth
PoraShore — Travel Booking PlatformTravel
Dokti — Booking & Reservations PlatformBooking
Shipped & verifiable — every tile here is ours or on the record
TypeScript
Firebase
Tailwind CSS
Node.js
PostgreSQL
OpenAI API
Sudoku MasterLive · Google Play
Money AI — Expense TrackerLive · Google PlayTypeScript
Firebase
Tailwind CSS
Node.js
PostgreSQL
OpenAI API
Sudoku MasterLive · Google PlayMoney AI — Expense TrackerLive · Google PlayCore Capabilities & Practices
We engineer software that speaks to results.
Scroll down to explore each flagship practice. Built as modular, high-impact cards that pin and stack smoothly — just like our end-to-end product delivery process.
01/06
Intelligent Systems & Logic#01
AI & Automation Copilots
AI that pays rent inside your product — with honest evals, not demo magic.
We integrate production-grade LLM pipelines and autonomous workflow automations where they eliminate real overhead: document-grounded RAG assistants, intelligent triage, streaming chat UX with guardrails, and deterministic fallbacks that never fail cold.
Scope
8 Core Deliverables
Avg. Timeline
3 – 6 Weeks
Latency Target
< 450ms P95
Core Models
OpenAI · Gemini · Claude
Key Deliverables:
- Use-case audit & skip-list
- RAG over your private docs & vector index
- CI evaluation scorecard & regression suite
- Cost budgeting & latency caching layers
AI
“Where an AI feature wouldn't survive contact with real users, we tell you upfront and ship deterministic code instead.”
Lead AI Engineer · Chimbuk Intelligent Logic
ai-development.config.ts
Autonomous RAG Pipeline
Hybrid Search · pgvector · Guardrail Filters
99.4%
Evaluation Score
-42%
Token Efficiency
100%
Human Gates
Cross-Platform & Native Mobile#02
Mobile App Development
Flutter & native architectures engineered for release — and for year three.
We design and build buttery 60fps mobile products across iOS and Android. The Chimbuk studio maintains its own published consumer apps — Sudoku Master, Money AI, and Invoice Maker — live on Google Play, using the exact same CI/CD and offline-first persistence we deploy for clients.
Scope
Architecture to Store
Avg. Timeline
4 – 8 Weeks
Live Proof
3 Published Apps
Framework
Flutter · Kotlin · Swift
Key Deliverables:
- Offline-first SQLite & background synchronization
- Material 3 & Cupertino adaptive interaction design
- Automated Play Store & App Store deployment pipelines
- Crashlytics & real-time telemetry integration
MP
“Our published apps prove we know how to survive store policies, updates, and harsh low-end device constraints.”
Mobile Practice Lead · Chimbuk Mobile Studio
mobile-app-development.config.ts
Sudoku Master & Money AI
60 FPS Flutter Canvas · Offline-First Engine
4.9 ★
Google Play Rating
99.8%
Crash-Free Rate
380ms
Cold Start
Modern Web Systems & SaaS#03
Modern Web Systems
Next.js 16 App Router, React 19, and full-stack performance with sub-50ms TTFB.
Enterprise web systems and SaaS portals engineered for extreme speed and search visibility. We combine hybrid Static Site Generation, React Server Components, zero-layout-shift Core Web Vitals, and typed REST/GraphQL backends that scale gracefully.
Scope
Full-Stack Web App
Avg. Timeline
3 – 7 Weeks
Lighthouse
100 / 100 / 100
Stack
Next.js 16 · TS · Tailwind v4
Key Deliverables:
- Modular design tokens with dark/light themes
- Full JSON-LD structured data & deep technical SEO
- Edge middleware authentication & secure session handling
- Automated CI/CD with Vercel or AWS Edge deployment
WS
“Speed isn't an afterthought — it's built into every component hierarchy from day one, eliminating costly client-side bloat.”
Web Systems Lead · Chimbuk Web Studio
web-development.config.ts
Next-Gen SaaS Console
Turbopack Build · React 19 Server Actions
32ms
TTFB Global
0.8s
LCP Vitals
90+
Prerendered Routes
Omnichannel Commerce & Payments#04
Commerce & Storefronts
High-conversion digital storefronts wired for local checkout and courier reconciliation.
Built from hands-on operational experience. We architect bespoke e-commerce engines with native bKash, Nagad, and SSLCommerz checkouts, automated courier booking (Pathao, Steadfast), instant cash-on-delivery tracking, and sub-second catalog navigation.
Scope
Storefront & Engine
Avg. Timeline
3 – 6 Weeks
Checkout Speed
1-Click Flow
Integrations
bKash · Nagad · Stripe
Key Deliverables:
- High-speed mobile checkout with minimal friction
- Courier API webhooks and real-time parcel tracking
- Automated stock & inventory reconciliation ledger
- Dynamic promo campaign & discount rule engine
CO
“We ran our own store end-to-end before writing this software. We know how returns, cash reconciliations, and couriers actually operate.”
Commerce Architect · Chimbuk Operations
ecommerce-platforms.config.ts
Jhotpot Commerce Suite
bKash Tokenized Checkout · Multi-Courier Sync
+34%
Conversion Lift
< 4.1%
Checkout Dropoff
Instant
Order Velocity
Product Design & Tokens#05
UI/UX & Design Systems
Design systems engineered for code — clean mathematical discipline meets modern aesthetics.
We design interfaces that bridge the gap between creative visual emotion and production implementation. Comprehensive Figma design libraries, accessible contrast tokens, micro-interactions, responsive prototypes, and clear engineering documentation that developers love.
Scope
Figma to CSS Tokens
Avg. Timeline
2 – 4 Weeks
WCAG Rating
AAA Accessible
Hand-off
Zero Engineering Friction
Key Deliverables:
- Atomic component library with responsive auto-layout
- CSS variable design token mapping (colors, spacing, type)
- Interactive Framer/Figma motion prototypes
- Production-ready typography and micro-interaction specs
DS
“Every pixel we design is constructed with real code constraints in mind. What you approve in Figma is exactly what ships in production.”
Design Systems Lead · Chimbuk Design Studio
ui-ux-design-systems.config.ts
Ascent Design System
Hairline Grid · Syne & JetBrains Mono Tokens
140+
Components
Automated
Token Sync
100%
Dark/Light Modes
Cloud Architecture & Legacy Rebuilds#06
Cloud & Custom Software
Resilient infrastructure, zero-downtime databases, and modern software architectures.
When off-the-shelf software breaks under scale or legacy debt threatens your business, we build tailored cloud backends and modernize legacy monoliths. You retain 100% ownership of your source repositories, cloud infrastructure, and deployment keys.
Scope
API & Infrastructure
Avg. Timeline
4 – 10 Weeks
Uptime SLA
99.99% Reliability
Cloud
AWS · Vercel · Supabase · Cloudflare
Key Deliverables:
- Zero-downtime schema migrations & database tuning
- Serverless & containerized microservice architectures
- Automated automated staging/production CI/CD workflows
- Role-based access control (RBAC) & security hardening
PA
“No vendor lock-in, no hidden royalties. Everything we write lives in your private repository with clean, readable documentation.”
Principal Architect · Chimbuk Cloud Practice
cloud-custom-software.config.ts
Distributed Edge Topology
PostgreSQL · Redis Cache · Global Anycast
18ms
Edge Response
99.99%
SLA Uptime
100% Client
IP Ownership
[05]Industries
Proven success in every industry.
Six verticals, one studio. Every card below is something we built ourselves — a live product on Google Play or a production blueprint, never a borrowed logo.
Drag or scroll
[06]AI-Powered Engineering
Smarter engineering, supercharged by AI.
From discovery audits to production rollouts, we blend frontier AI models with strict software engineering to deliver faster, sharper, and data-grounded product results.
OpenAI GPT-4oGoogle Gemini 1.5 ProAnthropic Claude 3.5pgvector & EmbeddingsLangChain & LlamaIndexNext.js 16 EdgeSupabase VectorsRedis Semantic CacheFigma Design SystemsFlutter Mobile AI
OpenAI GPT-4oGoogle Gemini 1.5 ProAnthropic Claude 3.5pgvector & EmbeddingsLangChain & LlamaIndexNext.js 16 EdgeSupabase VectorsRedis Semantic CacheFigma Design SystemsFlutter Mobile AI
- 02
Ground
Retrieval over your own documents, help centre and product data — so every answer can point at the source it came from.
Produces
- RAG index over your corpus
- Source-linked answers
- A golden evaluation set
- 03
Build
Typed LLM features shipped inside your codebase, with guardrails, streaming and graceful fallbacks — not a black box on the side.
Produces
- Typed API contracts
- Streaming + caching
- Fallback paths that don't fail cold
- 04
Prove
Eval scores, latency and cost per request are measured before anything meets a real user. Human gates guard every side effect.
Produces
- Eval scorecard in CI
- Cost & latency model
- Model-upgrade runbook
[07]Why Choose Us
Chimbuk's Alternative? Think One More Time!
Every option has a real-world trade-off. Here is our direct comparison against traditional agencies, in-house hires, and freelancers — so you can make decisions on facts, not sales pitches.
| Criterion | Chimbuk | In-house hire | Large agency | Freelancer |
|---|---|---|---|---|
| Design + engineering in one senior team | Yes | Partly | Yes | Partly |
| You own the code, accounts & IP | Yes | Yes | Partly | Yes |
| A fixed price before work starts | Yes | No | Partly | Partly |
| AI & automation built in, not bolted on | Yes | Partly | Partly | No |
| First release in weeks, not quarters | Yes | No | No | Partly |
| Maintained and improved after launch | Yes | Yes | Partly | Partly |
| Documented, transparent process | Yes | Partly | Partly | No |
- Chimbuk
- Yes
- In-house hire
- Partly
- Large agency
- Yes
- Freelancer
- Partly
- Chimbuk
- Yes
- In-house hire
- Yes
- Large agency
- Partly
- Freelancer
- Yes
- Chimbuk
- Yes
- In-house hire
- No
- Large agency
- Partly
- Freelancer
- Partly
- Chimbuk
- Yes
- In-house hire
- Partly
- Large agency
- Partly
- Freelancer
- No
- Chimbuk
- Yes
- In-house hire
- No
- Large agency
- No
- Freelancer
- Partly
- Chimbuk
- Yes
- In-house hire
- Yes
- Large agency
- Partly
- Freelancer
- Partly
- Chimbuk
- Yes
- In-house hire
- Partly
- Large agency
- Partly
- Freelancer
- No
Design + engineering in one senior team
You own the code, accounts & IP
A fixed price before work starts
AI & automation built in, not bolted on
First release in weeks, not quarters
Maintained and improved after launch
Documented, transparent process
Yes What we stand behindPartly Possible, with caveatsNo Not the norm
Marks describe typical patterns from our own experience across these engagements — not a claim about every provider, and not a guarantee. The Chimbuk column is the offer we’ll put in writing.
[08]Own products
Products of our own, live on Google Play.
Drag or scroll
Sudoku Master: Free SudokuPuzzle / Brain training
Sudoku Master
Offline-first sudoku on Android — guided hints that teach the logic instead of spoiling it.
AndroidGoogle PlayContains ads
Money AI - Expense trackerFinance / Productivity
Money AI — Expense Tracker
Expense tracking with XP, levels and streaks — privacy-first: local data, optional user-owned Drive sync.
AndroidGoogle PlayContains ads
Invoice Maker: Estimate & BillBusiness tools
Invoice Maker
Professional invoicing for freelancers and small shops — six PDF templates, 140+ currencies, works fully offline.
AndroidGoogle PlayContains ads · In-app purchases
[09]Process
Five stages, one accountable team.
- 011–2 weeks
Discovery & scoping
Two workshops, one document. We map users, constraints and success metrics, then write the scope you'll hold us to.
You bring
Half-days, honest answers, signed brief
We deliver
Scope doc, risk list, fixed milestone plan
- 022–4 weeks
Design & prototype
Flows before pixels: wireframes, then a clickable prototype in your brand (or ours, if you don't have one yet).
You bring
Feedback rounds — two included per artifact
We deliver
Design system, prototype, accessibility pass (axe)
- 034–16 weeks
Engineering sprints
Two-week sprints in your repos. Demo every sprint; staging from sprint one; change requests priced from a pre-agreed rate card.
You bring
Sprint reviews, timely decisions
We deliver
Typed codebase, tests, CI with Lighthouse + axe gates
- 041–2 weeks
Launch & rollout
Store submissions, analytics, monitoring, rollback plan. We've survived Play review before; your listing won't be our first rodeo.
You bring
Accounts & sign-offs ready (we'll checklist them)
We deliver
Release runbook, store copy, 30-day hypercare
- 05Ongoing
Support & maintenance
Monthly retainer or hourly agreement: OS/SDK updates, dependency patching, crash triage, quarterly performance reviews.
You bring
A named contact, a shared inbox
We deliver
Uptime-focused maintenance, change log, quarterly report
[10]Field notes
Outcomes we can prove.
Puzzle / Brain training
Sudoku Master
Published on Google Play (free, ad-supported) — package com.chimbuk.sudoku_master, fully offline play.
Offline-first sudoku on Android — guided hints that teach the logic instead of spoiling it.
AndroidGoogle Play (free, ad-supported)com.chimbuk.sudoku_masterAug 2026View verified factsFinance / Productivity
Money AI — Expense Tracker
Published on Google Play (free, ad-supported) — package com.chimbuk.expense, local-first with user-owned backup.
Expense tracking with XP, levels and streaks — privacy-first: local data, optional user-owned Drive sync.
AndroidGoogle Play (free, ad-supported)com.chimbuk.expenseJul 2026View verified factsBusiness tools
Invoice Maker
Published on Google Play (free with optional unlocks) — package com.chimbuk.invoice_maker, works fully offline.
Professional invoicing for freelancers and small shops — six PDF templates, 140+ currencies, works fully offline.
AndroidGoogle Play (free with optional unlocks)com.chimbuk.invoice_makerAug 27, 2026 (scanner feature)View verified factsPlatform / In-house
This website — the Chimbuk platform
This site rebuilt as a Next.js App Router application — production static build (92/92 pages).
This site: a hand-built Next.js 16 + Tailwind design system with a Firebase CMS pipeline planned for the backend phase.
View verified facts
[11]Trust
Trusted by people. Chosen by brands.
Trust is earned with things you can verify, not adjectives. So here are the receipts — every one of them open to inspection.
- Products live on Google Play
- Service lines, one team
- Products & blueprints in the open
- 2019
- Building & maintaining since
Live, public listings
Three apps you can open on Google Play right now — a real developer page, real screenshots, real update dates. Nothing here is a mock-up.
Open the developer page“No data collected” on the label
Every published app carries Google Play's own data-safety disclosure: no data shared with third parties, no data collected. That's the store's label, not our copy.
See the store factsYou own what we build
Repositories, cloud projects and store accounts are created under your organisation from day one; we collaborate inside them. Ownership is not an upgrade tier.
Read the ownership policyWe don't publish reviews we can't prove
No quote appears on this site until a client has approved its wording in writing. Until then this card tells the truth instead of a nice-sounding fiction.
Shipped on our own pipeline
Our own products go through the same CI, staged rollout and monitoring we run for clients — we are the first customer of every process we sell.
See the platform caseAnswered inside one working day
Whether it's a yes, a no, or a “try this instead,” you hear back within a working day — the same standard we hold in every milestone board.
Start a conversation[12]Insights
Field writing from the build floor
Drag or scroll
5 Nov 2026 · 11 min read
Postgres with pgvector vs. dedicated vector databases: benchmarks and TCO at 10M embeddings
Before committing to a $1,500/month dedicated vector database, benchmark Postgres with HNSW indexing. Real-world latency numbers, recall trade-offs, and why one database for relational data and vectors simplifies production.
Read it
3 Nov 2026 · 12 min read
Zero-trust API security for Next.js and FastAPI: JWT revocation, rate limiting, and mTLS
Stateless JWTs cannot be revoked cleanly, API keys get leaked into client bundles, and naive IP rate limiting breaks behind Cloudflare. Here is the defense-in-depth security architecture we deploy for enterprise endpoints.
Read it
28 Oct 2026 · 10 min read
Building a production B2B micro-SaaS: multi-tenant schema, Stripe billing, and audit logs
Building a multi-tenant SaaS requires three foundational decisions: tenant data isolation, billing state synchronization without race conditions, and compliance audit logging. A battle-tested blueprint.
Read it
More pieces are in the owner review queue — we publish when they are right, not when they are ready to draft.
[02b]Concept lab
Popular app concepts, rebuilt live in your browser
89+ working screens across 12 product concepts — ride-sharing to neobanking. Not screenshots: every frame is real code running in this page, openable in dev tools, built as one codebase for phone, tablet and web.
- 9:41
RideFlow
One tap to your first ride
+880 1XXX-XXXXXXOTP · 6 digitsLogin with Google
Biometric protected · data minimised by design
RideFlowRide-sharing
- 9:41
The nest
Hillside glass house
Entire home · 4 guests · Rakhain foothills
৳9,200 / night
★ 4.98 · 121 verified stays
- Sunrise deck & outdoor bath
- Self check-in · smart lock
- Free cancel until Nov 10
- Concierge answers in < 5 min
StayNestShort-term stays
- 9:41
Sara · picker
Live on your order #A-2231 · end-to-end encrypted
Tomatoes are the firmer local kind — ok?
Yes, and no capsicum this week
Saved to your never-list 👍
Bagging now — seal strip will read 2231
Quick replies · tap to sendQuickCartGrocery quick-commerce
- 9:41
Reception
- 1Specialist
- 2Doctor
- 3Time
Tue 10:30
Dr. Farhana · in-clinic
Tue 17:00
video consult
Wed 09:00
first available
Emergency
use hotline — never here
MedCareTelehealth & clinics
- 9:41
Sadia I.
Learner · B1 track
41
streak (2 freezes)
1,204
words live
87%
recall last 30d
- Weak areaspolite endings · numbers
- Class planThu club · Sat sprint
- Parent viewmom sees weekly digest
- Exportsprogress PDF, A2 cert pending
LearnlyGamified learning
- 9:41
Send money
secure · tokenised
- To: Mom · bKash৳8,000
- Instant rails fee৳0 (plan)
- Note“Eid extra ❤️”
- Balance after৳11,420
Confirm face · scheduled 18:00 (she checks after iftar)
FinPulseNeobank & money insights
Original concept studies — clearly labelled, since claiming real clients we don't have isn't our style.
[03b]Flutter-first engineering
One codebase. Every screen your customer owns.
We build with Flutter — Google's open UI toolkit — because your users don't care which store the app came from. One Dart codebase compiles to Android, iOS, web and desktop with the same design system, the same state logic, the same release day.
60fps everywhere
Impeller rendering — smooth on ৳12k Androids, crisp on Retina iPhones.
Hot-reload velocity
Design fixes land in seconds during builds; you see progress live.
Web + admin included
The same widgets power your back-office console — no second project budget.
One team, one fix
A bug dies once and stays dead on every platform.
9:41
Safety
Everything you'd hope never to tap
Search or paste a link…
- SOS — alert contacts + 999armedHeld for 2 seconds · works offline
- Share live trip linkExpires at drop-off
- Audio trip recordEncrypted, device-only until flagged
- Report driverRides paused during review
Same concept · phone frame + web frame · same components
- 12
- product concepts in the Lab
- 89+ live screens
- 3
- own apps on Google Play
- updated this quarter — public record
- 08
- practices under one roof
- AI → mobile → web → design → commerce → cloud → brand → growth
- 100%
- static & server-rendered
- Lighthouse-gated, no client bloat
[05b]The growth playbook
We show you the map before we sell you the plane
Every engagement starts from these four moves — you keep this framework whether or not you ever hire anyone. It's the same order we run ourselves; the scroll below is the whole method in four steps.
- STEP 01
Diagnose before you digitise
Most businesses don't have a software problem; they have a leak — leads lost on WhatsApp, repeat customers untracked, inventory guessed. Map one week of real operations before commissioning anything.
- Where do customers actually find you?
- Which 20% of work eats 80% of hours?
- What data already exists (order books, spreadsheets)?
- STEP 02
Ship the smallest honest product
A booking app that replaces 200 daily calls is worth more than a 'digital transformation' platform nobody finishes. One flow, done properly, in weeks — then iterate against usage, not opinions.
- One user journey, end-to-end, delightful
- Real data from day one (no fake-door builds)
- Launch checklist: stores, analytics, backups
- STEP 03
Let the product sell while you sleep
Now the compounding starts: SEO-visible catalogue, app-store presence, push that respects the user, referral loops with honest numbers. This is where 'growth' stops being a poster word.
- Search indexing + structured data wired
- Retention: notifications with a budget (yours)
- Measure: cohort charts, not screenshot metrics
- STEP 04
Add the AI layer once the rails exist
With real traffic and real data, AI earns its keep: support deflection over your own docs, demand forecasting, catalog enrichment. We audit, price and ship it with evaluation sets — or tell you to wait. Waiting is often right.
- Use-case audit + skip-list in writing
- Cost per action modelled at 10× traffic
- Human fallback on every AI path
[13] FAQ
Your questions, answered.
The straight answers to what buyers ask us most — pricing, ownership, security, AI and how a project actually starts.
How do you price projects?
Fixed scope against a signed brief, split into milestone payments. After discovery you get a number, not a range. If scope changes later, it is priced in writing before work starts — the change rate is agreed in the same document so nobody negotiates under deadline.
Who owns the code, accounts and store listings?
You do, from day one. Repositories, cloud projects and store accounts are created under your organisation; we collaborate inside them. That includes design files, documentation and any admin tooling we build for you.
Which mobile stack will my app use?
Our default is React Native or Flutter for product coverage at realistic budgets; native Kotlin when performance or deep OS integration justifies it. We maintain production apps in this family ourselves, so recommendations come with maintenance numbers, not vendor slides.
How do you work with international clients?
Remote-first: two fixed daily overlap windows with your region, one shared milestone board, and a written weekly note — shipped, blocked, next. Decisions live in documents, so nothing waits on a meeting.
How is my app or admin secured?
Authentication with role-based access (custom claims), database security rules maintained as code and tested in CI, server-side validation on every input, and a documented backup/restore drill before handover. We provide the rule files and the drill notes — you can audit them any time.
I see Firebase mentioned — is the backend already built?
This site launched frontend-first: content runs through a typed, adapter-based layer with a local source. The Firebase integration (Firestore content, Auth-based admin, Storage media) is the planned next phase; nothing in the UI will need rewriting for it.
How do we start?
Send the rough version — a paragraph, a spreadsheet, a napkin photo. Within one working day you get either a discovery proposal or a straight 'we're not the right fit, try this' — both are useful answers.
Do we actually need AI features in our product?
Sometimes — and we audit before you buy. The test is a workflow where text, documents or judgement are the bottleneck: support deflection, drafting, classification, search over your own corpus. If the win is a slide rather than a saved hour, we write it into the skip-list and ship deterministic code instead. The audit is billable, short, and honest by design.
Where does our data go when AI features are used?
Only where the contract says it goes. Default posture: provider APIs with no-training settings, keys and retention configured per agreement, PII minimised or redacted in the pipeline, and a written data-flow note in the repo. If a use case needs zero-egress, we price on-device or self-hosted options instead of pretending the cloud is free.
Didn’t find it? Browse the full FAQ or send the rough version of your idea — a paragraph is enough to start.
Bring the rough idea.
Leave with a plan.
One paragraph is enough to start — we reply within a working day with questions, a direction, and whether we're the right studio for it.