Іван

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Ivan Shamshur ​
Fullstack Engineer | Senior PHP Developer

LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація»)​
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)​
Telegram: https://t.me/ivanshamshur

General

Experienced developer focused on creating scalable SaaS solutions from scratch.
My strength lies in designing complex systems: from high-performance databases
(MySQL, ClickHouse) to interactive interfaces on React. I have practical experience
in optimizing high-load systems (caching, queues, big data analytics) and
integrating modern AI solutions (GPT/Gemini). In my work, I value code cleanliness,
architectural soundness, and a focus on the end business metrics of the product.

15+ years of experience in web development. I know how to turn ideas into
working, scalable products.

TECHNICAL SKILLS

Core Stack

●​ Frontend: React, JavaScript (ES6+), Vite, React Query, React Hook Form,
i18next, LESS/CSS.
●​ Backend: PHP 8.4, Yii2, REST API Design, Service Layer Architecture.
●​ Database: MySQL (Optimization, 3NF), ClickHouse (OLAP/Analytics),
JSON-fields.

Infrastructure & DevOps

●​ Cloud & Storage: AWS S3, CloudFront (CDN), CloudFlare.
●​ Caching & Queues: Redis, Memcached, Message Queues (Background Jobs).
●​ Tools: Docker, Docker Compose, Git, Composer, NPM/PNP.

Advanced & Integrations

●​ AI: OpenAI (ChatGPT) API, Google Gemini API integration.
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●​ Real-time: Server-Sent Events (SSE).
●​ Math & Logic: mathjs (complex formulas), Logical branching algorithms.

Work experience
QuizLead.io​
Technical Lead
02.2025 – Present

A multifunctional SaaS quiz builder for marketing and education. Led the full-cycle
product development from scratch: from architectural design to deployment and
ongoing support.

TECH STACK: React (Vite), PHP (Yii2), MySQL, ClickHouse, Redis, Memcached,
Docker, AWS S3, CloudFront.

KEY ACHIEVEMENTS & RESPONSIBILITIES:

BACKEND & DATABASE ENGINEERING

●​ Architectural Design: Engineered the MySQL database schema following 3NF
principles, ensuring data integrity and high system performance.
●​ Reduced primary database load through multi-level caching (Memcached &
Redis).
●​ Optimized "heavy" queries using Slow Query Log and EXPLAIN; improved data
retrieval via composite indexes and JOIN refactoring.
●​ Implemented ClickHouse to enable real-time processing of millions of events
and conversion funnel building.
●​ Utilized MySQL JSON fields for flexible storage and implemented real-time
updates via Server-Sent Events (SSE).

FRONTEND & LOGIC

●​ Developed a visual builder featuring question branching (logic jumps), a scoring
system, and a dynamic price calculator (mathjs).
●​ Established a modern build process with Vite, React Query for state
management, and React Hook Form.
●​ Implemented full multi-language support (4 languages) using i18next.

INTEGRATIONS & INFRASTRUCTURE

●​ Designed a REST API and integrated Generative AI (Gemini, ChatGPT) to
automate quiz content generation.
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●​ Cloud Storage: Configured media storage on AWS S3 with CloudFront
(CDN) for low-latency delivery.
●​ Developed connections with external CRM systems and messengers via
background queue processing.
●​ Established local development environment via Docker and managed
deployment to dedicated servers.

FINTECH & PAYMENTS

●​ Architected and implemented a secure billing engine from scratch, handling
subscriptions, invoices, and transaction logs.
●​ Integrated Stripe and PayPal for seamless fiat transactions, including
webhooks handling and automated refund logic.

FormDesigner.pro​
Co-Founder & Lead Architect | Senior Fullstack Developer
01.2013 – 02.2025

A versatile, high-traffic web-based SaaS platform designed to build professional
online forms, complex calculators, and booking systems without writing code.
Guided the product from a blank canvas to a mature, scalable enterprise solution.

TECH STACK: PHP (Yii2), jQuery -> React (16 -> 18), MySQL (Replication),
Codeception, AWS S3, CloudFront CDN, REST API, Webhooks.​

KEY ACHIEVEMENTS & RESPONSIBILITIES:

PRODUCT ARCHITECTURE & DATABASE ENGINEERING

●​ Greenfield Development: Spearheaded the end-to-end architectural design
and development of the entire SaaS platform from scratch.
●​ Database & High Availability: Designed and optimized a highly scalable
MySQL database schema; implemented and managed Master-Slave
replication to ensure high availability and read scalability.
●​ Storage & Delivery: Architected user file storage by integrating AWS S3
coupled with CloudFront CDN for secure, low-latency asset delivery
worldwide.
●​ Quality Assurance: Established a robust testing culture by writing
comprehensive unit and integration tests using Codeception, ensuring
system stability during rapid feature deployments.
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FRONTEND EVOLUTION

●​ Legacy Migration: Successfully led a critical frontend migration, moving the
core form-building interface from jQuery to React 16 to improve
performance and code maintainability.
●​ Modernization: Upgraded the frontend ecosystem from React 16 to React
18, leveraging modern state management, concurrent rendering
capabilities, and optimized build tools.
●​ Visual Builders: Developed complex, drag-and-drop interactive interfaces
for form customization, dynamic logical branching, and real-time validation.

FINTECH & INTEGRATIONS ECOSYSTEM

●​ Payment Gateways: Integrated multiple local and international payment
systems, managing secure subscription billing, webhooks, and automated
transactional workflows.
●​ Integrations Engine: Built a powerful integration layer allowing seamless
data synchronization between user web-forms and dozens of external
services, including leading CRMs, email marketing tools, and messengers.

SeoPult​
Yii developer
12.2012 – 02.2016

A leading automated SEO and inbound marketing platform. Worked on a core
sub-product focused on link-building automation and search engine optimization
management.

TECH STACK: PHP, Yii2, React 16, MySQL, REST API, Background Jobs.

KEY ACHIEVEMENTS & RESPONSIBILITIES:

●​ Automation Platform Development: Developed and maintained backend
services for an automated link-purchasing engine, processing high volumes
of external platform data.
●​ Architecture Modernization: Participated in migrating legacy code to the
Yii2 framework and building efficient REST APIs to power a dynamic user
interface.
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●​ Frontend Enhancement: Integrated React 16 into the platform's frontend
ecosystem, creating interactive dashboards for campaign monitoring, link
analysis, and SEO reporting.
●​ Data Processing & Integrity: Optimized heavy database queries in MySQL
and designed robust background jobs to handle automated external link
verification and budget tracking.

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LinkUp​
Yii developer
03.2011 – 12.2012

An IT company providing web hosting services and infrastructure solutions.
Contributed to the development and maintenance of the company's core internal
web hosting management platform.

TECH STACK: PHP, Yii1, MySQL, JavaScript, REST API, Linux.​

KEY ACHIEVEMENTS & RESPONSIBILITIES:

●​ Core Product Development: Developed and optimized the backend logic
for the company's proprietary web hosting platform using the Yii1
framework.
●​ Automation & Billing: Contributed to the automation of hosting
provisioning, domain registration workflows, and internal billing service
layers.
●​ API Integrations: Developed integrations with domain registrars, payment
networks, and server control panels via REST/SOAP APIs.
●​ Database Optimization: Designed relational database schemas in MySQL,
focusing on processing transactions and managing user account
configurations efficiently.
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Intraweb Design​
PHP developer
05.2009 – 03.2011

A digital web agency specializing in custom web development and e-commerce
solutions for various business clients.

TECH STACK: PHP 5, MySQL, JavaScript, HTML/CSS, CMS (various frameworks).

KEY ACHIEVEMENTS & RESPONSIBILITIES:

●​ Backend Development: Engineered robust backend logic for a diverse range
of client projects, managing full-cycle development from initial requirements
to deployment.
●​ E-commerce & Business Websites: Developed and customized
high-performance e-commerce platforms, corporate websites, online stores,
and promotional landing pages.
●​ Database Design: Created efficient MySQL database schemas, optimized
SQL queries, and integrated third-party APIs for shipping, payment
gateways, and inventory management.
●​ Content Management Systems: Built custom modules, plug-ins, and
extensions to extend CMS functionality according to specific client business
needs.

Education

Donetsk National Technical University​
Specialist degree in engineering · (2003 - 2007)