Mobile apps · Backend & APIs · Web · AI integration

Mobile apps, backends and AI. Built by one senior team.

Flutter and React Native apps, FastAPI backends, React web and LLM features. One team from the first spec to long after launch.

Share your idea See how we work

Years building mobile appsiOS, Android and cross-platform: 13+
Projects deliveredapps, web platforms and backends: 53
Yours to owncode, IP, repos and store accounts: 100%

Selected work

Things we've built.

See all

Fintech 2023 30 weeks

Sabika Gold

Sabika Gold: gold trading across iOS, Android, and web
- Gold trading platform built for iOS, Android and web
- Real-time gold prices streamed to every device
- Physical gold custody with Al Rajhi Bank
- Flutter
- FastAPI
- SQL Server
- Socket.IO
Read case study App Store Google Play
Fintech · Telecom 2024 30 weeks

TSD (Bridging the Distance)

Cross-border airtime and prepaid electricity top-ups in 5 seconds
- Top-ups complete in about 5 seconds
- 130+ operators across 44 countries
- One backend for the app, web and resellers
- React Native
- React
- FastAPI
- Postgres
Read case study App Store Google Play
Hospitality 2023 32 weeks

JustKeyLess

Keyless hotel access from web, iPad, and mobile
- Phone, iPad and desktop from one codebase
- Bluetooth locks respond in under a second
- Room calendar handles 50+ rooms smoothly
- Flutter
- FastAPI
- SQL Server
- flutter_blue_plus
Read case study App Store Google Play
Automotive 2023 24 weeks

Car Bidding (used-car auction platform)

Live auction bidding without the timer drifting
- Daily live auctions with 30-second bid windows
- Bids reach every device in one round-trip
- Server-side timer, so no clock drift
- React Native
- React
- FastAPI
- FastAPI WebSocket / socket service
Read case study App Store Google Play
AI 2023 4 weeks

Didier AI

Voice-first GPT-4 assistant from one Flutter codebase
- Voice to GPT-4 answer, streamed back live
- Android, iOS, iPad and web from one codebase
- Built and launched in 4 weeks
- Flutter
- OpenAI GPT-4
- OpenAI image generation API
- Native platform ASR
Read case study App Store Google Play

What we build

Mobile, backend, web and AI. One team ships all four.

The app, the API behind it, the data underneath, and the services it plugs into.

Full-stack · connected · live

All systems

Flutter React Native

https://techypanther.com

Flutter React · Next.js

01 · Client

The app and website your users tap

→ REST API · gRPC · WebSocket · GraphQL

REST API gRPC WebSocket GraphQL

FastAPI · Python

POST /leads 200

84ms · auth: jwt · microservices · background jobs

02 · Core engine

The engine that runs it

→ SQL · Cache

SQL Cache

SQL PostgreSQL
MySQL

NoSQL MongoDB
Redis

Vector Pinecone
pgvector

03 · Data layer

Where your data lives, on your stack or ours

→ Services Integration

Services Integration

Payments Stripe
Razorpay

LLMs OpenAI/Gemini
Claude/Ollama
Fine-tuned

Storage S3
GCS

04 · Services

Payments, AI and storage, plugged in

Mobile apps

iOS and Android apps prepared for App Store and Google Play review.

Flutter or React Native: one codebase for iOS and Android, picked to fit your product and your team.
Design included: UI/UX in Figma, or we build from your designs.
Offline-first: local storage and sync, so the app still works on a train with no signal.
Payments and push: Stripe, Apple Pay, Google Pay, RazorPay, FCM and deep links, wired in properly.
Store releases handled: App Store and Play submission, review replies, and staged rollouts.

Flutter
React Native
Dart
Figma
Firebase
Stripe
FCM
Deep links
App Store
Play Store

Mobile app development →Flutter →React Native →Case study: offline marketplace in 104 countries →

Push delivered · FCM

Hotel booking system: calendar of room reservations across rooms and dates

Mobile wallet app: balance, contacts, and transaction list

Stripe

Paid · Apple & Google Pay

Backend, APIs & data

FastAPI, Pydantic and async Python for typed APIs and background jobs.

FastAPI-first: typed endpoints, async Python, and Pydantic validation, so fewer runtime surprises.
Real background work: Celery and Redis queues for jobs and retries, not cron hacks on a forgotten box.
Safe migrations: schema changes that don’t break production on a Friday evening. Reversible, staged, and reviewed.
Postgres as the source of truth: with Redis for cache and pgvector when search needs it.

FastAPI
Python
PostgreSQL
Redis
Celery
REST + GraphQL
WebSockets
Docker
AWS · GCP · DO

Backend development →Case study: live auctions without timer drift →

Deploy succeeded

v1.42.0 · 4m 12s

PROD · us-east-1

api-gateway

Healthy

RPS

1.2k

LATENCY

84ms

p50 · 142ms p95

PODS · 4 RUNNING

api-7f2b

api-9a34

api-c1ef

api-d820

12 queued

Celery · background jobs

Web & admin panels

Web and admin interfaces that don't fight the team using them.

React and Next.js: marketing sites, product surfaces, and internal admin panels on one toolchain.
Rendering per page: SSR or SSG where speed matters, client-side where it doesn’t.
Accessibility from the first component: WCAG AA, not bolted on before a compliance review.
Integrations done properly: Stripe, Twilio, SendGrid, social auth, and CRM wired into your flows.

React
Next.js
Astro
Tailwind
React Query
Vitest
Playwright
Vercel · Cloudflare · AWS

Frontend development →React →Case study: keyless hotel access on web, iPad, and mobile →

Lighthouse

perf · a11y · seo

app.techypanther.com/admin

Good morning, Panther

MRR

$12.4k

12%

ACTIVE

842

CHURN

2.1%

0.3%

USER STATUS

active

pending

AI integration

LLM features that earn their running costs.

Keys stay on the server: a FastAPI proxy holds the API keys, so nothing secret ships in the app bundle.
Swappable models: OpenAI, Claude, Gemini, or a local model via Ollama, switched without an app release.
RAG on your data: pgvector or Pinecone retrieval, so answers come from your documents, not guesses.
Cost and quality controls: rate limits, spend caps, and eval runs before a prompt change goes live.

OpenAI
Claude
Gemini
Ollama
pgvector
Pinecone
Streaming (SSE)
Function calling
Evals

AI integration →Case study: voice GPT assistant in 51 languages →

POST /v1/assist

support-assistant

Streaming

Can I change my booking to Friday?

Yes. Your plan allows one free change. Friday 10:00 and 14:00 are open

claude · 3 sources 812 tok · $0.004

Keys on server Cap: $40 / day

Have an app idea, or an app that needs help?

Tell us what you're building. You get honest feedback and a practical next step, even if that means starting smaller.

Share your idea See our work

How we work

Five steps. No mystery.

A disciplined pipeline from first call to long-term care. Each stage has a defined output so you always know what you’re paying for and what you’ll get next.

01 Discover 02 Architect 03 Build 04 Release 05 Support

Stage 01 / 05 Spec + plan

Discover

Two-week scoping sprint, live overlap with your hours.
You leave with a written spec, architecture plan, and a build quote.
Not a sales pitch.

Stage 02 / 05 Blueprint locked

Architect

Data model and service boundaries agreed up front.
Infrastructure and deployment pipeline documented.
Nothing hits production until the plan is locked.

Stage 03 / 05 Two-week cadence

Build

Short sprints on a two-week cadence.
Live demos every fortnight.
Course-correct as we go, with no surprises at the end.

Stage 04 / 05 Test · release · monitor

Release

Functional testing across flows, devices, and edge cases.
App Store and Play Store submission handled.
Deployment, CI/CD, and staged rollout.
Observability is wired in from day one.

Stage 05 / 05 24×7 · iterate

Support

We stay after launch.
24×7 monitoring and fast fixes.
Iteration as your product grows.

Engagement models

Same engineers, different shapes.

Every engagement starts with a two-week discovery sprint that ends in a written spec and a fixed quote.

MVP sprint

Fixed scope, fixed timeline, one platform, one to two flows.

Best for Pre-seed founders validating an idea before fundraising.
Full product build

Discovery to launch, with our team owning the delivery: design handoff, build, store release, and support.

Best for Startups and companies without an in-house engineering team.
Dedicated team

Your roadmap, our engineers across mobile, backend, and web. Onboarding in three to five days, scaled up or down month by month.

Best for Scale-ups whose backlog is outrunning the team, and agencies that need white-label capacity.
Rescue and audit

Written audit of the codebase, architecture, and pipeline, then we rebuild the parts that earn it. Most rescue jobs cost less than a full rewrite.

Best for Products stuck on a stalled build, a departed developer, or a codebase nobody wants to touch.

FAQ

What founders, product teams, and agency partners ask us.

Most projects run eight to sixteen weeks. We occasionally take on short audits or architecture reviews.

Fixed price once the architecture is locked. Hourly during discovery or for ongoing maintenance.

You do. All intellectual property, all repositories, all cloud accounts in your name.

Yes. Mutual NDA before we get into specifics.

Yes. We've inherited projects in Flutter, React Native, Node.js, and Python. Every takeover starts with a written audit.

LLM APIs (OpenAI, Anthropic, Google), local models via Ollama, RAG pipelines, vision, and voice. Integrated cleanly, not bolted on.

Yes. Play Store and App Store submission, review responses, staged rollouts, and ongoing releases are part of every mobile engagement.

Yes. We partner with agencies globally on Flutter, React Native, FastAPI, and cloud engagements. Mutual NDA first, IP assigned to your agency, delivery under your brand, and we never approach your clients directly.

Yes. Most of our founder clients don't have one yet. Our discovery sprint is designed for this: we translate your product into a written spec, a data model, and a build plan you can hand to any future CTO.

Yes. Payments (Stripe, PayPal, Apple Pay, Google Pay, RazorPay, Paytm), auth (Auth0, Clerk, Firebase), comms (Twilio, SendGrid, Intercom), AI (OpenAI, Anthropic, Google), social logins, CRM, and analytics, plumbed cleanly into your flows, not bolted on.

Mobile apps, backends and AI. Built by one senior team.

Things we've built.

Sabika Gold

TSD (Bridging the Distance)

JustKeyLess

Car Bidding (used-car auction platform)

Didier AI