Since 2019 we2app has designed and built 120+ mobile, web and desktop apps for fintech, healthcare, ecommerce and SaaS teams worldwide. Rated 4.9/5 across 38 Clutch reviews and trusted by 500k+ users, we deliver senior-led measurable outcomes. Below are three detailed case studies — MedTrack, ShopLytics and FitLaunch — with challenges, solutions, tech stacks, timelines and verified metrics. Explore our services, solutions, process and pricing to see how we ship.
Across 42 live App Store / Play Store listings. 50k+ downloads on top app (MedTrack, 4.8★).
App Store Connect, 42 apps
Efficiency gain40%
Average workflow time reduction after replacing spreadsheets / legacy tools. Measured at 30/60/90 days.
Before/after ops audits
On-time delivery98%
Sprints delivered on agreed date. Bi-weekly demos, fixed-price milestones — no “it’s almost done”.
120 projects, Notion sprint logs
Security record0 breaches
Zero critical data breaches. Secure code reviews, encrypted storage, GDPR-minded handling since 2019.
Internal sec. audits
Metrics aggregated from 120+ projects (2019–2026). Figures from client-reported revenue/savings, Firebase/App Store analytics, and sprint logs. Available for verification on discovery call.
Selected work — detailed breakdowns
Case Studies That Show How We Ship
Three recent launches across healthcare, ecommerce and SaaS. Each includes challenge, solution, tech stack, timeline and verified metrics.
Healthcare • iOS, Android & Web • Ho Chi Minh City • 2025
MedTrack — HIPAA-Aware Care Coordination for 50k+ Patients
MedTrack is a care coordination platform for a healthtech team managing 12 clinics and 50,000+ active patients. Built for clinicians and field nurses, it replaces paper forms and legacy EMR workflows with secure, offline-first charting and automated referrals. The product now holds a 4.8★ rating and serves as the primary system of record, with FHIR-compatible APIs linking to lab and pharmacy systems.
Challenge
Before we2app, patient data was fragmented across spreadsheets, paper forms and a seven-year-old EMR. Duplicate records hit 38%, referrals took 3–4 days to process, and field nurses in low-connectivity districts had no offline access. Nurses spent 6+ hours weekly on manual re-entry, compliance audits flagged gaps in access controls, and clinic managers lacked real-time visibility into patient flow. The client needed a compliant, reliable system that worked offline, synced securely, reduced admin burden and could scale to four additional clinics within a year without rewriting their lab integrations.
Solution
We delivered a unified mobile and web platform with offline-first charting, background sync and conflict resolution, role-based access with audit logs, encrypted storage at rest and in transit, and automated referral workflows. We ran collaborative design sprints, mapped clinician and nurse journeys in Figma, and built a component design system for consistency. The app adds FHIR-compatible APIs, push notifications for critical updates, and a clinician dashboard with patient timelines and referral status. Integration adapters kept existing lab systems intact, while onboarding flows cut staff training from two days to three hours with in-app guidance.
Tech Stack
Flutter
Swift (iOS)
Kotlin (Android)
React
Next.js
Node.js
PostgreSQL
AWS
Firebase Auth & FCM
FHIR APIs
Timeline
10 weeks — 2 weeks discovery & prototype, 6 weeks agile sprints (bi-weekly demos in Slack & Notion), 2 weeks security review, App Store submission & training
We started with a 10-day discovery: stakeholder interviews, shadowing nurses, and auditing the legacy EMR schema. Prototype validation with five clinicians confirmed offline sync priorities. Six weeks of fixed-price sprints followed, each ending with a demo and acceptance. Final two weeks covered penetration testing, HIPAA-aware controls review, TestFlight rollout to 40 nurses, store submission and on-site training for 12 clinics.
Results & Metrics
50k+Downloads4.8★ on App Store
42%Less admin time6 hrs saved / nurse / week
31%Faster referralsFrom 3.4 → 2.3 days
$210kAnnual savingsReported by client
98%On-time sprintsAll 5 sprints delivered
0BreachesZero critical since launch
Post-launch, referral completion accelerated 31% and duplicate records fell to 4% within 90 days. Admin time dropped 42%, freeing 6+ hours per nurse weekly for patient care. The client expanded to four new clinics in six months without additional headcount and reports $210,000 in annual operational savings. The platform now handles 12,000+ daily chart updates with offline sync success above 99.4%.
ShopLytics — Real-Time Inventory & Analytics for 200+ Merchants
ShopLytics is an ecommerce analytics and inventory platform serving 200+ Shopify and WooCommerce merchants processing $18M+ GMV monthly. It unifies orders, inventory and retention analytics into a fast PWA dashboard with live alerts and one-click exports. Rated 4.7★ by merchants, it replaced a patchwork of spreadsheets and a slow legacy dashboard that threatened retention.
Challenge
Merchants churned at 25% annually because inventory and analytics lived in separate tools. Stockouts occurred weekly, reports took 8 seconds to load and failed 12% of the time during peak sales, and low-stock alerts arrived hours late. The legacy sync failed silently, support tickets averaged 140 per week, and onboarding new merchants took three days of manual mapping. The founders needed sub-second dashboards, 99%+ sync reliability, automated alerts and onboarding in hours — without forcing merchants to change their existing Shopify or WooCommerce setups.
Solution
We rebuilt ShopLytics as a real-time PWA with a resilient data pipeline: unified Shopify and WooCommerce connectors with idempotent ledger sync, Redis-backed queues, automated low-stock and anomaly alerts, and a React + Next.js dashboard with sub-second filtering, saved views and CSV exports. We added offline caching, role-based merchant and staff views, and a self-serve onboarding wizard that maps stores in four hours. The backend includes Stripe billing, Firebase Auth and audit logs, while the design system streamlined merchant education and support.
Tech Stack
React
Next.js
PWA
Node.js
Python (ETL)
PostgreSQL
Redis
GCP
Stripe
Firebase
Timeline
8 weeks — 10 days discovery & prototype, 5 weeks build (weekly demos), 11 days load testing, PWA install & training
Discovery included mapping 18 merchant workflows and instrumenting the legacy pipeline to measure failure rates. We validated a clickable prototype with six merchants in week two. Five weeks of sprints delivered connectors, ledger and dashboard iteratively, with weekly demos and staging access. Final 11 days focused on load testing to 5,000 events per minute, PWA install flows on iOS and Android, and training for support staff.
Results & Metrics
120k+Monthly active users200+ merchants
99.2%Sync reliabilityUp from 88%
60%Faster reports8s → 3.2s avg.
25% →12%Churn dropIn 90 days
18%Revenue growthQoQ after launch
34%Fewer tickets140 → 92 / week
Within 90 days, sync reliability rose to 99.2%, report generation sped up 60%, and churn fell from 25% to 12%. Merchants report 34% fewer support tickets and onboarding now completes in four hours instead of three days. The platform ingests 2.1M inventory events daily, and client revenue grew 18% quarter over quarter, with GMV retention improving across all cohorts.
FitLaunch — Investor-Ready Fitness SaaS from Idea to Seed in 6 Weeks
FitLaunch is a subscription fitness and coaching platform that helps users follow HD video workouts, track habits and chat with coaches. Built for a solo founder racing to close a seed round, it needed an investor-ready MVP with polished UX, billing and analytics in weeks — not months. The app reached 1,200 beta users on TestFlight with a 4.9★ early rating and powered a $1.2M raise.
Challenge
The founder had wireframes, a waitlist and 1,800 early signups but no shippable product. Two prior freelancers delivered inconsistent UI, unstable Stripe flows and no subscription lifecycle handling. Video playback buffered, analytics were missing for investor decks, and there was no coach admin portal. The founder needed a credible, stable demo in under a month to hit a seed fundraising window, plus clean, documented code that could pass technical due diligence and scale to 10,000 users without a rewrite.
Solution
We shipped a cross-platform MVP with onboarding, paywalled subscriptions, HD video workouts with offline caching, habit streaks, coach chat and a web admin with cohort, retention and revenue dashboards for investors. We led product workshops to prioritize scope, created a Figma design system with a full component library, and implemented RevenueCat for subscription lifecycle, Segment and Mixpanel for analytics, and Stripe Billing for plans and coupons. The codebase includes docs, API specs and handover so the founder owns 100% of IP from day one.
Tech Stack
Flutter
React
Next.js
Node.js
PostgreSQL
Stripe Billing
RevenueCat
Segment
Mixpanel
Firebase
Timeline
6 weeks — 1 week prototype & user validation, 4 weeks focused sprints (demo every 5 days), 1 week TestFlight, store assets & deck
Week one produced a testable prototype validated with 12 target users, confirming onboarding and video UX. Four weeks of focused sprints followed with demos every five days and shared Notion and Slack boards. Final week handled TestFlight distribution to 1,200 beta users, App Store assets, subscription QA across edge cases, and a metrics packet for the pitch deck.
Results & Metrics
1,200Beta users4.9★ TestFlight rating
40%Onboarding liftCompletion +40%
$28kBuild costFixed-price, 6 weeks
$1.2MSeed raisedClosed in 3 weeks
8kMAU in 4 monthsPost-seed growth
98%On-time deliveryAll sprints on date
Onboarding completion improved 40% versus the prior prototype, and the app’s 4.9★ beta rating helped anchor investor demos. The founder closed a $1.2M seed round within three weeks of the demo and scaled to 8,000 MAU in four months without rewriting. Build cost was $28,000 fixed-price, delivered 98% on time, with full IP transfer, docs and analytics ownership from the first commit.
Get a senior tech review and fixed-price estimate within 24 hours. We sign NDAs before you share details and you own 100% of the code. See services, process, pricing and solutions for fintech, healthcare, ecommerce and SaaS.
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