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information Silich Alexander
Fullstack Developer
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Summary
LinkedIn
Experienced Full-Stack Developer with over 3 years of commercial experience in developing modern
GitHub web applications. Specializing in building efficient server-side architecture using Node.js (NestJS,
Nikopol, Ukraine Express) and Python (FastAPI), as well as creating user interfaces with React, Next.js, and TypeScript.
Possess practical experience in integrating AI solutions (LLM APIs) and basic application deployment in

Tech skills the AWS cloud. My previous leadership background managing an engineering department enables me to
deeply understand business goals and approach development with a systemic mindset.

JavaScript
TypeScript
Work Experience
Python 2024 - Present
Next.js Sigmatronix – Part-time
React Fullstack developer
Core Stack: Next.js 15, TypeScript, Tailwind CSS, Radix UI, React Query, Nest.jS,
React Native
TypeORM, PostgreSQL, Redis, BullMQ, Google Vertex AI, OpenAI, Docker, Descope,
Vue.js 3 Explorium, CrustData.
Redux Implemented scalable B2B sales intelligence workflows for company discovery,
Node.js stakeholder mapping, contact enrichment, and deal analysis.
Built AI-powered sales features including Deal Copilot, stakeholder insights,
Nest.js
prospecting recommendations, and contextual chat over company data.
FastAPI Developed NestJS backend modules with PostgreSQL/TypeORM, Redis caching,
MongoDB BullMQ background jobs, and modular task processors.
PostgreSQL Integrated external data providers such as Bombora, Explorium, CrustData, Proxycurl,
and HubSpot to enrich company and contact intelligence.
Express
Improved bulk contact enrichment performance using provider fallbacks, batching,
Prisma ORM permission tracking, and credit-based unlock flows.
TypeORM Implemented public API endpoints with API key authentication, usage logging, billing
WebSockets context, and company enrichment capabilities.
Intersection Observer API 2024 - 2026
Zustand TeGem – Part-time
Fullstack developer
REST API
Core Stack: JavaScript/TypeScript, React.js, Next.js, Node.js, Python (FastAPI), PostgreSQL
Responsive / Adaptive design (SQLAlchemy/Drizzle), Redis, WebSockets/Socket.io, Docker, GitLab CI/CD.
GIT Architected and deployed high-load multi-tenant microservices and whitelabel
Docker architectures, enabling a single codebase to dynamically serve multiple independent brands
via runtime hostname resolution or custom header routing (X-Client-Id) with strict data
AWS
isolation across all database models.
Designed and built central asynchronous API Gateways using FastAPI and httpx to route
Soft skills ~150+ endpoints across 42 routers to specialized downstream services, implementing
shared keep-alive connection pools for low-latency routing.
Purposefulness Engineered scalable, enterprise-grade frontend applications (up to 48.5k+ LOC) utilizing
React 18/19, Next.js (SSR/RSC), and Vite, establishing reusable UI component systems
Perseverance
(50+ components) and interactive analytics dashboards via Recharts and Konva Canvas.
Teamwork Implemented real-time bidirectional communication layers using WebSockets and
Time management Socket.io, developing custom event protocols for chat modules, live notifications, and
Stress resistance server-authoritative state synchronization with client-side prediction.
2023 - Present
Languages Sun.agency
Fullstack developer
Core Stack: JavaScript/TypeScript, React.js, Next.js, Node.js, PostgreSQL, React-Hook-
English - Pre-Intermediate
Form, Framer-Motion
Ukrainian - Native Developed and maintained high-performance web applications and corporate websites
Russian - Proficient using React.js, Next.js, and TypeScript, ensuring pixel-perfect, cross-browser, and fully
responsive layouts.
Engineered complex, highly interactive user interfaces and micro-interactions utilizing
Framer Motion, significantly boosting user engagement and elevating the overall digital
experience.
 Optimized rendering performance, eliminated redundant re-renders, and fine-tuned
UI components to achieve a stable 60 FPS and excellent Core Web Vitals /
Lighthouse scores.
Implemented Server-Side Rendering (SSR) and Static Site Generation (SSG)
architectures in Next.js to drastically minimize page load times and maximize SEO
efficiency for client projects.
Integrated sophisticated multi-step forms, dynamic questionnaires, and advanced
data-filtering systems using react-hook-form, streamlining client-side validation and
improving conversion rates.
Built and maintained robust backend services using Node.js, while designing
efficient relational database models and optimizing complex queries in PostgreSQL.
Collaborated closely with UI/UX designers to accurately translate intricate design
concepts, custom motion curves, and complex animations into clean, modular, and
highly maintainable code.

Education
The National Metallurgical Academy of Ukraine
2014 - 2018
Mechanical engineering, Master's degree in Applied Mechanics
IT School GoIT
2023 - Present
Fullstack Developer

Project Experience
WaterTracker REST API, Link [TypeScript, Node.js, Express, MongoDB, Mongoose ODM]
Web application built using Node.js as a server technology, designed for convenient and secure storage of
information about daily water consumption.

Contacts REST API, Link [TypeScript, Node.js, Express, MongoDB, Mongoose ODM]
Web application built using Node.js as a server technology, designed for convenient and secure storage of
contact information.

Phonebook, Link [TypeScript, React, Redux, React Hooks, React Router Dom, REST API, Git, CSS-in-JS]
Personal project made using the React JS library. The project is an application for storing the user's phone
book. The application provides the user with the ability to register and store a list of contacts with the ability
to add, update, and delete contacts. For each contact, the ability to call, write an email and write a message in
Telegram. For this application, a web application was developed using Node.js as server technology, designed
for convenient and secure storage of contact information.

My contacts, Link [React Native, Redux, React Hooks, React Navigation, REST API, JavaScript, Git, CSS-in-JS]
Personal project made using the React Native library. The project is an application for storing the user's
contacts book. The application provides the user with the ability to register and store a list of contacts with
the ability to add, update, and delete contacts. For each contact, the ability to call, write an email, and write a
message in Telegram.