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  1. Freelancers

Oleksandr Serhiiovych

Offer Oleksandr work on your next project.

Ukraine Rovno, Ukraine
1 month 22 days back
Available for hire available for hire
1 Safe completed
3 years back
1 client
on the service 6 years
Freelancer Oleksandr S. — Ukraine, Rovno. Core skill — Javascript and Typescript, Python

Rating

Successful projects
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Average rating
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Rating
219
Javascript and Typescript
1779 place out of 3449
Python
1649 place out of 4457

Language proficiency level

Українська Українська: fluent
English English: elementary

Skills and abilities

Programming

Photo, Audio & Video

Portfolio


  • AI Resume Builder

    Web Programming
    AI Resume Builder — example of freelancer's portfolio work in category Web Programming
    Full-Stack Developer (Solo) | 2026

    Designed, architected, and deployed a full-stack AI-powered SaaS platform for resume creation, optimization, and analysis with an integrated AI Copilot.

    … Key Achievements

    - Built a real-time AI Copilot with streaming SSE, server-side tool execution (resume CRUD, quality scoring, job matching), and support for 4 LLM providers (OpenAI, Anthropic, Google Gemini, Groq) via unified Vercel AI SDK interface
    - Developed a rich resume editor — 16 section types, drag-to-reorder, live PDF preview, snapshot-based version history with restore
    - Implemented 10+ AI features — ATS scoring (0–100), job matching with skills gap analysis, resume parsing (PDF/DOCX/URL), section generation, bullet rewriting, deep analysis with AI-generated fix suggestions
    - Engineered async processing pipeline — 5 BullMQ queues (PDF export, resume parsing, GitHub sync, AI quality, deep analysis) with Redis-backed workers
    - Built ATS-optimized PDF export — Puppeteer + browserless/chrome, async queue, caching
    - Designed 35-table PostgreSQL schema — Prisma ORM, composite indexes, quota system (FREE/PRO via feature flags), GDPR-compliant hard delete
    - Implemented BYOK (Bring Your Own Key) — users connect their own AI API keys, encrypted with AES-256-GCM at rest
    - Set up production infrastructure — Docker Compose, Nginx, PgBouncer, GitHub Actions CI/CD, monitoring (Sentry + Prometheus + Grafana + Loki)
    - Shipped admin panel — user management, feature flags, quotas, content blocks, audit log
    - Added GitHub Pages integration — one-click resume publishing with auto-sync, public URLs with SSR + SEO

    Tech Stack

    TypeScript · Next.js 16 · React 19 · NestJS 11 · PostgreSQL 17 · Prisma 7 · Redis · BullMQ · Vercel AI SDK · Zustand · TanStack Query · HeroUI v3 · Tailwind CSS v4 · Puppeteer · NextAuth.js 5 · Docker · Nginx · GitHub Actions · Turborepo

Reviews and compliments on completed projects 1

24 October 2022 124 USD
Python Backlink for Mobile App + API

Quality
Professionalism
Cost
Contactability
Deadlines

Everything went wonderfully. Thank you for the quality work. Alexander is always in touch and with him it is easy to keep communication.

Pavel Kabanets | Safe Safe | Response review

Activity

  Latest proposals 10
Front end for the website
226 USD
UI/UX designer / Frontend developer (web interface for AI/analytics)
582 USD
Frontend TG WebApp Development
95 USD
Website creation
338 USD
Restore server operation
11 USD
"Modern website for your business"
451 USD
Develop a minimum viable product (MVP) for a data management platform.
474 USD
Development of a custom multi-page website with landing pages for a coach and NLP therapist
20 USD
Frontend developer
11 USD
Business card website connection
100 USD