// CASE STUDIES

Cases with concrete results

Short and to the point: tasks, what was done, and measurable effect.

// In short

Updated:July 2, 2026Alex Rel

Real client projects I delivered end-to-end — SaaS platforms, Telegram bots, and web applications. Each case lists the original task, what I built, and the measured result.

012024

SaaS / AI B2B

TeleGo.io

Fullstack Developer & Product Owner

Launched SaaS platform for Telegram sales automation with AI assistant

500+users6 mosMVP×3conversion growth

Developed and launched a platform for Telegram sales automation with AI responses, billing, and admin panel.

→Designed architecture: Nuxt 3 + Node.js + PostgreSQL + Redis
→Integrated OpenAI for responses from client's knowledge base
→Set up payment processing (Stripe, Telegram Stars, crypto)
→Created admin panel for scenario management and analytics
→Designed and launched MVP in 6 months

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022023

SaaS / HubSpot / Integration

LeadSync AI

Lead Architect & Backend Developer

Developed B2B SaaS for automated lead synchronization and AI scoring

50M+leads synced99.9%uptime−60%manual work

Designed and built a B2B SaaS integration platform that gathers leads from messaging channels, syncs them to CRM systems like HubSpot, and scores them using AI.

→Designed a high-throughput Node.js / NestJS backend using RabbitMQ queues
→Developed a fault-tolerant integration bus for HubSpot, Salesforce, and amoCRM
→Implemented AI lead scoring microservice powered by OpenAI GPT-4o
→Configured distributed PostgreSQL database with multi-tenant schema isolation
→Integrated Stripe subscription billing with dynamic API usage metering

032019

EdTech / AI B2C

LingvoHabit

Fullstack Developer

Created language learning platform with gamification and AI conversation partner

1000+students15 min/dayavg session72%retention

Developed a platform with daily lessons, AI conversation partner, and habit system for learning foreign languages.

→Implemented daily lesson system with adaptive difficulty
→Integrated AI conversation partner for speaking practice
→Added gamification: streaks, achievements, leaderboards
→Set up subscriptions and automated reminders
→Optimized Core Web Vitals to 95+ score

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042013

E-commerce / WordPress

Corset Academy

Fullstack Developer

Developed custom WordPress e-commerce site for corset patterns and lessons

StripeintegrationPayPalpayments2013launch

Created a fully custom WordPress theme and plugins for an e-commerce store selling wedding dress and corset patterns, integrating international payment systems Stripe and PayPal.

→Designed and developed a responsive custom WordPress e-commerce store
→Developed custom plugin for digital product delivery and protection (patterns)
→Integrated and configured Stripe and PayPal payment gateways
→Optimized media catalog load times for sewing video courses
→Created user account dashboard with download history

// CONNECT

Contact Information

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telegram @releeshahn

email[email protected]