Web platforms
Customer portals, marketplaces, booking systems and internal tools. Fast to load, accessible, and built to grow without a rewrite.
React · Next.js · Node · PostgreSQL
Builds
Web & SaaS
Web · Mobile · AI · SaaS
Smart Software.
Built for Growth.
QuanTrexApps designs and builds web platforms, mobile apps and AI features for teams that want working software in weeks, with every sprint measured against what your business needs to grow.
</>Clean code
Release gate● Passing
Sprint 04On schedule
Growth
Ships
iOS & Android
Integrates
AI & data
You own
100% of the code
Why QuanTrexApps
QuanTrexApps isn't just a dev shop. It's a senior team that treats every feature like a measurement: defined, built, tested, shipped.
Most software projects go wrong in the gap between what was asked for and what was built. We close that gap with written specs, weekly demos and a working build you can click from the second week.
Startups come to us for a first product. Established businesses come to us to replace the spreadsheet, the legacy portal or the app nobody wants to touch. Either way you get one accountable team across design, engineering and launch, and a codebase you own outright.
Explore
Everything,
one click away.
01 · Services
Six things, done properly
Web platforms, mobile apps, AI, SaaS, design and cloud. Plus three live demos of how we work.
Open Services → 02 · WorkProblem. Build. Result.
Engagement blueprints for field service, SaaS billing and AI document search.
Open Work → 03 · MethodThe QuanTrexApps Method
Six steps from discovery to improvement, our definition of done, and the numbers we commit to.
Open Method → 04 · EngageSprint, Build or Partner
Three ways to work with us, compared side by side.
Open Engage → 05 · NotesFrom the build log
Short reads on spec-driven development, passkeys and Core Web Vitals.
Open Notes → 06 · AboutSmall team, senior hands
Who we are, what we value, and the roles we're hiring for.
Open About →Ready when
you are.
Tell us what you're building. You'll get a reply within one business day and a rough scope after the first call.
Start a project →Home/Services
Services
Six things,
done properly.
Pick one, or let us run the whole product from first sketch to store listing.
Mobile apps
Native-feeling iOS and Android apps from one codebase, with offline support, push notifications and store submission handled for you.
Flutter · React Native · Swift · Kotlin
AI integration
Assistants, document search, classification and automation wired into your product, with evaluation sets so you know the answers are right.
LLM APIs · RAG · Agents · Evals
SaaS products
Multi-tenant apps with sign-up, billing, roles and admin dashboards. The plumbing every SaaS needs, so you can focus on what makes yours different.
Auth · Stripe · Multi-tenancy · Analytics
UI/UX design
Research, flows, prototypes and a design system your engineers can build from. Tested with real users before a line of production code.
Figma · Prototyping · Design systems
Cloud & DevOps
CI/CD pipelines, infrastructure as code, monitoring and cost control on AWS, Google Cloud or Azure. Deploys become a non-event.
AWS · GCP · Docker · Terraform
Powered by method
Try how
we work.
Scope, set honestly
Choose a starting point.
Every project starts with a scope you can read in five minutes. Switch between a clickable prototype, a launchable MVP and a product built to scale, and see what changes.
Calibrated,
not padded.
not padded.
Scope dialMVP
Typical timeline
8–12 wks
Core team
3–4
Demos
Weekly
Indicative ranges. Your written scope after discovery is the real number.
Spec-driven development
Say it plainly. We write the spec.
Before anyone codes, each feature becomes a user story, an API contract and a test. Type a feature below and watch the first draft appear. Our real specs go further, but the shape is the same.
One sentence in.
Three artifacts out.
Three artifacts out.
Spec compilerv1 · runs in your browser
Performance budgets
Fast is a requirement, not a hope.
We set Core Web Vitals budgets on day one and check them in every pull request. These are Google's "good" thresholds, and the bar our builds have to clear before release.
Budgeted in CI.
Not after launch.
Not after launch.
Release gatePassing
Thresholds: LCP ≤ 2.5 s, INP ≤ 200 ms, CLS ≤ 0.1 at the 75th percentile. Bars show an example build against them.
Home/Work
Work
Problem.
Build. Result.
Three engagement blueprints showing how we take a typical brief from problem to launch.
Blueprint 01 · Mobile
Problem
Build
Result
Stack
Working with us
Built in,
not bolted on.
Runs on your cloud.
Refuses lock-in.
We deploy to your AWS, Google Cloud or Azure account. If we part ways tomorrow, everything keeps running.
Every Friday
Weekly demos
Click the real build, not a screenshot.
QA built in
Automated tests run on every pull request. Manual QA before every release.
Docs included
Architecture notes, runbooks and a handover your next hire can read.
Security by default
OWASP-checked, secrets in a vault, least-privilege access from the first deploy.
Async-first
One channel, one owner
A shared Slack or Teams channel and a named lead who answers for the whole project.
Support after launch
Monitoring, bug-fix SLAs and a monthly improvement budget, so launch day is the start, not the end.
Home/Method
Our method
The QuanTrexApps
Method.
Abstract
We present a delivery method for small, senior software teams that trades heroics for measurement. Each feature is specified in plain language, translated into a user story, an interface contract and an automated test, then built in a two-week cycle that ends with a live demo. Quality gates for performance, accessibility and security run on every change. The result is software that matches its brief and a client who knows where the project stands on any given day.
Procedure
- DiscoverInterviews, data review and a one-page problem statement everyone signs.
- SpecifyStories, API contracts, acceptance tests and a priced backlog.
- DesignFlows and a clickable prototype, tested with five real users.
- BuildTwo-week sprints, a demo every Friday, CI quality gates on every PR.
- LaunchStaged rollout, monitoring, store submission and handover docs.
- ImproveAnalytics review, a prioritised next release, support with SLAs.
Definition of done
feature: "reorder-past-purchase" done_when: - acceptance_tests: passing - code_review: approved_by_second_engineer - web_vitals: { lcp: "≤2.5s", inp: "≤200ms", cls: "≤0.1" } - accessibility: WCAG_2.2_AA - security_scan: no_high_findings - demoed_to_client: true - docs_updated: true
Commitments
Numbers we
put in writing.
2wks
Sprint length
Every cycle ends with a demo of working software, not a status slide.
1st
Day of repo access
You see every commit from day one, in your own GitHub or GitLab.
100%
Code ownership
IP transfers to you. No licence fees, no lock-in, no hostage source code.
0surprises
Unapproved changes
Scope changes are written down and priced before they're built.
Home/Engage
Engagement models
Choose your
stack height.
Sprint
A focused two-to-four-week engagement. Discovery, a clickable prototype and a costed build plan you can take anywhere.
Fixed price · quoted per scope
Build
Design, engineering and launch of your MVP or new product. A full squad, weekly demos, and a production release at the end.
Fixed price or milestones
Partner
A dedicated team that works as your product department. Roadmap, releases, support and growth, month after month.
Monthly retainer
| Sprint | Build | Partner | |
|---|---|---|---|
| Duration | 2–4 weeks | 8–16 weeks | Ongoing, monthly |
| Team | Lead + designer | Lead, designer, 2–3 engineers, QA | Dedicated squad, sized to roadmap |
| You get | Prototype, spec, estimate | Launched product in production | Continuous releases and support |
| Demos | End of sprint | Weekly | Weekly |
| Code ownership | Yours | Yours | Yours |
| Post-launch support | — | 30-day warranty | Included, with SLAs |
| Best for | Validating an idea before you fund it | Getting a first version to market | Scaling a product that's working |
Home/Notes
Field notes
From the
build log.
Spec-driven development in the age of coding agents
AI writes code quickly. It still needs to be told what correct looks like.
Read
Coding assistants are now part of most teams' daily workflow, and they are very good at producing plausible code. Plausible is not the same as correct. The fix is old-fashioned: write the specification first. When every feature starts as a user story, an interface contract and a failing test, an agent has a target it can be checked against, and a reviewer has something concrete to approve. We've found the spec also becomes the best documentation a project has, because it's the one artefact that's always current.
Passkeys: the cheapest conversion boost you'll ship this year
Fewer forgotten passwords, fewer support tickets, and phishing gets much harder.
Read
Passkeys replace passwords with a key pair stored on the user's device and unlocked with a fingerprint, face or PIN. They're supported across the major platforms and browsers, so most of your users can already use them. Because the private key never leaves the device and is bound to your domain, a fake login page can't capture it. Our advice is to offer passkeys alongside existing sign-in, prompt for one right after a successful login, and measure how many support tickets about access disappear.
INP is the Core Web Vital most sites quietly fail
Interaction to Next Paint measures how quickly your page responds every time someone taps.
Read
Google replaced First Input Delay with Interaction to Next Paint as a Core Web Vital in March 2024. Unlike FID, INP looks at responsiveness across the whole visit, so heavy JavaScript that runs after the first click now counts against you. A good score is 200 milliseconds or less at the 75th percentile. The usual culprits are long tasks on the main thread, oversized hydration and third-party scripts. Breaking work into smaller chunks and deferring what the user can't see yet fixes most of it.
Home/About
About us
Small team.
Senior hands.
QuanTrexApps is a product studio of designers and engineers who've shipped software for startups and established companies. We stay deliberately small so the people you meet in the first call are the people writing your code.
Measure first
If we can't say how we'll know it works, we don't start building it.
Plain language
No jargon in proposals, no surprises in invoices.
Own the outcome
We care whether the product works for your users, not only whether tickets are closed.
Leave it better
Clean code, real docs and a handover your next team will thank us for.
Careers
We hire people who like shipping.
Remote-first, small teams, real ownership. If you'd rather demo working software on Friday than talk about it on Monday, we'd like to hear from you.
Apply via contact form →Home/Contact
Contact
Got an idea?
Let's build it.
New projects & general
quantrexapps@gmail.com
Response time
Within 1 business day
First call
30 minutes, free, with the lead who'd run your project. You leave with a rough scope whether or not we work together.