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Denys Astafiev

@denysastafiev1

Senior Full-Stack Engineer at Independent Consultant who delivered a three-application vehicle inspection platform in three months.

Slovakia

Message

At CarSalePro LLC, I delivered a vehicle inspection platform in three months: an offline-first Flutter app, a NestJS backend with 134 REST endpoints, and a Next.js marketplace. I implemented Stripe Connect escrow payments and an offline-first data layer, then led two contract developers.

At Atlanta, I owned the backend and delivery infrastructure for a real estate portal with more than 100,000 monthly users. I built a CRM-to-database synchronization pipeline and resolved a production search timeout.

At Bytehive, I architected and developed an AI-driven analytics platform, integrated evaluation systems, and helped onboard the first paying clients within three months of development. The product secured a 6-figure investment within its first year.

As an Independent Consultant, I deliver production platforms for startup and agency clients across backend, frontend, mobile, and infrastructure. My work has also included AI decision-support and video-generation platforms, as well as commercial marketplaces.

Experience

Work history, roles, and key accomplishments

Current

Senior Full-Stack Engineer

Current

Independent Consultant

Dec 2025 - Present (9 months)

Deliver production platforms end to end for startup and agency clients: architecture, backend, frontend, mobile, and delivery infrastructure. Four client engagements to date.

Architecture Backend Frontend Mobile DevOps Delivery Infrastructure

Technical Lead and Full-Stack Engineer

CarSalePro LLC

Jun 2026 - Aug 2026 (2 months)

Delivered three applications in three months: an offline-first Flutter mobile app, a NestJS backend with 134 REST endpoints, and a Next.js marketplace. Led two developers and built two-sided marketplace payments with escrow on Stripe Connect.

Flutter Dart River Pod Drift SQLite Google MLKit NestJS TypeScript Prisma PostgreSQL Redis BullMQ Next.js React Tailwind Next Intl MapboxGL Stripe Connect Cloudflare R2 Render Vercel Codemagic Docker Playwright

Backend and DevOps Engineer

Atlanta

Mar 2026 - Jun 2026 (3 months)

Designed and built the backend of a real estate portal with more than 100,000 monthly users, including 36 feature modules, 39 data models, and 44 database migrations. Engineered a real-time data synchronization pipeline and owned the delivery infrastructure.

TypeScript NodeJS NestJS Pnpm TurboRepo PostgreSQL PostGIS Prisma Redis RabbitMQ Zod OpenAPI Swagger JWT Docker Docker Compose Bitbucket Pipelines Hetzner Linux

Full-Stack Engineer

Videfy.ai

Feb 2026 - Mar 2026 (1 month)

Integrated more than 20 AI models for photo and video generation into one unified system. Built infrastructure for dynamic admin-driven model onboarding and resolved critical system faults.

AI Model Integration System Architecture Stability Performance

Full-Stack Engineer

Insight Dev

Dec 2025 - Dec 2025 (0 months)

Architected a NestJS backend with modular domain-driven design and more than 13 feature modules. Engineered a two-phase AI reasoning system on OpenAI GPT models with LangChain.

NestJS TypeScript PostgreSQL MikroORM OpenAI GPTs Lang Chain Telegraf Twilio Winston JWT Swagger

Full-Stack Developer

Bytehive

Oct 2024 - Sep 2025 (11 months)

Architected and developed a full-stack analytics platform with AI-driven automation as the core feature, onboarding the first paying clients within 3 months. Integrated AI evaluation systems and led client communication and requirements gathering.

React NestJS fastAPI ExpressJS PostgreSQL MySQL SQLite TypeScript Python Jest Playwright

Full-Stack Developer

CGS-team

Jan 2022 - Oct 2024 (2 years 9 months)

Developed complex frontend features for contractor-facing and client-facing applications with React, Next.js, and Vue.js. Built backend services with NestJS and Express.js, and implemented RESTful APIs and business logic.