Семен

SEMEN LAPONOV
FULLSTACK DEVELOPER
PERSONAL INFO

Full-Stack Developer with 3+ years of experience building scalable web applications.
Proficient in a wide range of technologies: React, Next.js, and TypeScript on the
frontend; Node.js, NestJS, PostgreSQL, and MongoDB on the backend.
Focused on developing high-performance, secure, and scalable systems following
SOLID principles, Clean Architecture, and GRASP guidelines.
Experienced in system architecture design, writing unit, integration, and end-to-end
tests, integrating payment systems, and working with cloud platforms.

WORK EXPIRIENCE
CONTACT ME
Fullstack Developer
city of Brno, Czech Republic Elementica | April 2023 – March 2025
Sujanovo namesti st. 302/3
AI-powered educational platform
[open contact info](look above in the "contact info" section) Developed an AI-powered educational platform for both individual and corporate users,
implementing role-based access control (RBAC) and secure authentication to enhance data
protection and user safety.
https://github.com/laponovsemen
Built a responsive and multilingual user interface using Next.js, Tailwind, and Shadcn,
accelerating UI development and improving user experience.
[open contact info](look above in the "contact info" section) Designed and implemented functionality for creating, publishing, tagging, and sharing AI
models, supporting both B2B and B2C use cases to enhance collaboration and content
@laponovSemen accessibility.
Integrated Stripe for payments, transaction history, and invoice downloads, ensuring
SKILLS transparency and trust in user interactions.
Frontend: Backend: Added social authentication (Google, Facebook, Microsoft Azure, LinkedIn) with email
React Node.js verification and password recovery to streamline onboarding and login experiences.
Optimized platform performance using server-side rendering (SSR) and static site generation
Next.js NestJS
(SSG), significantly improving load times and scalability.
Redux Express Implemented real-time AI interaction through iframes with automated usage tracking and
TanStack Query PostgreSQL billing.
Participated in database design, trigger and transaction setup, and CRON job automation
Vite MongoDB
using Supabase and Drizzle; maintained architectural documentation to support team clarity
Webpack Mongoose and long-term maintainability.
Supabase Knex Established consistent database schema evolution via migration workflows using DrizzleORM
and DrizzleKit, enabling reliable integration of RPC contracts and system-wide stability.
TypeORM
Hono.js Front-End Developer
VSE INSTRUMENTI | January 2022 – March 2023
Instruments: Testing: DevPortal
Git unit Developed an internal tool for managing teams, incidents, post-mortems, and departments,
Docker e2e aimed at improving the user experience in team management and increasing infrastructure
visibility across the company.
Husky screenshot test
Built the UI using React and Material UI with a focus on micro-frontend architecture
Prettier storybook
(Backstage by Spotify), which improved development efficiency across multiple teams and
ESLint reduced versioning conflicts.
Vercel Used gRPC and Protocol Buffers to optimize backend integration and enhance development
speed and quality through strong typing.
Render
Implemented a backend-for-frontend (BFF) layer to accelerate the integration of new UI
Netlify
components.
Enhanced security with DDoS protection and JWT-based authentication.
LANGUAGE SKILLS
Wrote documentation to support ongoing maintenance and facilitate project handover to
English — В2 (Upper-Intermediate)
other teams.
German — B1 Developed user interfaces for an e-commerce platform.
Ukrainian — native Created responsive layouts and ensured cross-browser compatibility.
Russian — native Integrated with backend APIs and optimized performance.
Migrated legacy codebase from Vue 3 to React + TypeScript.
EDUCATION Built a backend service for managing department data using Express, PostgreSQL, and Knex
ORM.
Kherson State maritime Academy
Bachelor degree in engineering (2018 – 2023)