Small aviation operators had no affordable tool for compliance-aware mission planning - most software was built for large fleets and priced accordingly. Built Aviater solo from spec to deployment: real-time pilot eligibility signals, duty time enforcement, drag-drop scheduling, and full audit trails. Charter operators can now plan compliant missions and log flights without a dedicated compliance officer.
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Hariom Sharma (harryy)
I build product systems that survive real users
Technical lead and product engineer with 10+ years across React, Next.js, TypeScript, payments, analytics, mobile, cloud, and AI-assisted engineering.
400K+
Users reached
3-5x
AI-assisted speed
-25%
Payment failures
15+
Engineers led
Featured
Systems I've built
Technical Lead · Full-time · 5 yrs
Scaled platform from scratch to 400K users
Worked directly with executives to define product direction and technical roadmap. Led 15+ engineers building the platform end-to-end - grew to 400K users, +9% checkout conversion, -25% payment failures, and 20x infrastructure scale at 25% lower cost.
GrowthDay
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Engineering Lead · Full-time · 6 yrs
Built scheduling infrastructure used by Google and Telefónica
Architected Saastack - a modular SaaS framework that let enterprise clients get production scheduling without building from scratch. Led 8 engineers; the same codebase powered Google and Telefónica, cut load times from 15s to under 1s, and compressed delivery from a year to a month.
Appointy
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Solo · Full-stack · AI · Personal project
Shipped AI-powered fitness marketplace from zero to production
Defined the product, designed the system, and shipped solo - two-sided marketplace with AI coaching, program builder, real-time messaging, and Stripe billing. Zero to production with full ownership at every layer.
My Trainer Connect
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AI Engineering
AI speed with engineering discipline
AI coding tools are useful only when the repo gives them rules, context, and checks. My focus is turning individual AI shortcuts into repeatable engineering systems that teams can trust.
I use this in real repos: rules in version control, focused skills, small agent tasks, local checks, and review loops before anything ships.
Agent Tooling
dotagent
Cross-platform agent framework for Claude Code, Codex, and Gemini CLI with reusable skills, specialist agents, commands, repo checks, and on-demand context loading.
Bun
vibe-pilot
AI coding-agent autopilot for task classification, model routing, workspace orchestration, duplicate prevention, and stacked PRs.
Astro
web-smith
Design-to-code tool that extracts assets and design tokens, then rebuilds sites as Astro/Tailwind projects with Lighthouse and visual-diff checks.
Selected work
Shorter stories
Different problems, different scales - each one required owning the outcome.
Schools in India needed a mobile ERP without separate development for every institution. Built Accevate's student, teacher, and management apps across Ionic/Cordova/Angular and Expo/React Native, covering attendance, marks, timetables, fees, transport, homework, notifications, calls, and white-label school deployments.
View detailsAgencies needed to search prospect contacts, provision sending infrastructure, launch outreach, and hand results back to CRM without stitching five tools together. Built STF Leads Machine: lead search and lists, Instantly campaigns, Zapmail domains/mailboxes, GoHighLevel sync, analytics, admin tooling, and Google Sheets/Mapbox lead sync.
View detailsimproved EventRoostr's wedding and event booking payment flow across Next.js and Laravel: Stripe customer sessions, saved card/ACH methods, installment checkout, booking confirmation, and Stripe Automatic Tax planning.
View detailsconsulted for Okto Digital on an Ionic Vue and Firebase mobile app. Guided a team new to Ionic through architecture, user accounts, payments/subscriptions, external APIs, notifications, and touch-based mobile interactions.
View detailsFree trial abuse - disposable emails, shared accounts, repeated signups - was draining SaaS products with no simple fix. Co-built Vouch: email validation combined with device fingerprinting and IP reputation scoring, returning a single ALLOW/FLAG/BLOCK signal. One API call gives product teams a risk score they can act on without building their own fraud stack.
View detailsbuilt Aicadium NOVA for Temasek: sustainable finance dashboards with SLL records, KPI insights, consented peer benchmarking, monitoring views, and consent approval workflows across commercial real-estate assets.
View details Process
How I build
01
Understand the problem, not just the spec.
I talk directly to the founder or PM before touching anything. What actually needs to be built, what the edge cases are, and what success looks like - clarified early, not discovered mid-build.
02
Define the system before writing code.
Architecture, data flow, API contracts, and states are mapped first. At GrowthDay and Appointy, this step alone prevented weeks of rework on both the frontend and infrastructure.
03
Ship a working version fast.
A usable end-to-end slice first - not polished, but real. At GrowthDay, every major feature started rough and was refined after seeing how users actually behaved.
04
Iterate with real usage.
Analytics, logs, and user behaviour drive changes - not assumptions. Mixpanel and Statsig at GrowthDay guided every significant product decision after initial launch.
05
Stabilize and scale for production.
Performance, crash monitoring, retries, fallbacks, and edge cases. A feature isn't done until it handles the unhappy path and scales under real load. At GrowthDay, this meant 20x infrastructure scale at 25% lower cost. E2E coverage with Playwright and Jest before every release.
06
Leave it clean.
Reusable components, clear contracts, documented decisions. The 232-package Saastack framework was built this way - so any engineer could pick up any package without needing context from the last one.
Most projects break at step 1 or 2. Getting those right early is where most of the speed comes from.
Availability
Work together
Full-time
For teams where I can lead, build, and raise the bar.
I've led 15+ engineers at GrowthDay and 8 at Appointy while staying hands-on. I'm looking for roles where I can own technical direction, work directly with product/founders, and still write code.
Technical Lead / Staff Engineer Senior Product Engineer Principal Frontend Engineer Founding Engineer (early-stage) Engineering Manager (hands-on)
Contract
Selective consulting when the problem matches.
Full-stack builds from zero - Speak To Freedom, Aviater, My Trainer ConnectArchitecture and infrastructure overhauls - GrowthDay AWS migrationPayment integrations and checkout optimization - EventRoostr, GrowthDayMobile and web delivery - Accevate (Ionic/Angular), Okto Digital (Ionic Vue)
I scope it, architect it, build it, and deploy it. You get a production system, not a handoff document.
See case studiesBook a focused chat
Send the role, product surface, or problem you want to discuss. I will reply with availability and the fastest useful next step.
Email me Experience
Timeline
GrowthDay Technical Lead
- Worked directly with executives to define product direction. Led 15+ engineers across frontend, backend, mobile, and cloud - grew platform from scratch to 400K users.
- Drove 9% checkout conversion lift and 25% payment failure reduction - infrastructure and mobile platform work.
- Rebuilt AWS infrastructure with CloudFormation and Terraform. Scalability up 20x, costs down 25%.
2021 to 2026 400K+ users 20x scale
Appointy Intern → Engineering Lead
- Architected Saastack - a modular, hook-based SaaS framework serving 1M+ users. Same codebase powered Google and Telefónica without forking.
- Led a team of 8; caching cut load times from 15s to under 1s. FullCalendar integration cut delivery timelines from a year to a month.
- Grew from intern to engineering lead - frontend ownership, platform architecture, and client delivery across 4 years.
2015 to 2021 1M+ users 15s→<1s load time
Contract Engineer
- Speak To Freedom (2026) - full-stack leads platform from zero. Millions-scale contact DB, campaign engine, GoHighLevel CRM sync.
- Aviater (solo) - flight operations SaaS. Compliance scheduling, pilot eligibility, audit trails. Spec to deployment.
- Aicadium - built NOVA, a sustainability finance platform for Temasek. Sustainability-linked loan management, peer benchmarking, multi-signatory consent workflows.
- Okto Digital - Ionic Vue mobile app with Firebase. Payment gateways, subscriptions, push notifications, touch gesture interactions.
- Snappy Kraken - marketing tools and internal systems for a financial advisor platform. HubSpot CMS, campaign templates, content workflows.
- Accevate - three Ionic/Angular apps (student, teacher, management) for a school ERP. Attendance, fee payments, bus tracking. White-labeled across 500+ schools in India.
- EventRoostr - Apple Pay and Google Pay via Stripe. Vouch - co-founded fraud detection API.
2021 to present
