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Vitaliy S.
🇺🇦Ukraine
Created AtUpstaffer since May, 2026
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Vitaliy S. — Team Lead | Back-End Developer

Expertise in Back-End Web (6.0 yr.), AI and Machine Learning (6.0 yr.).

 Last verified on May, 2026

Core Skills

Python
Python
6 yr.
FastAPI
FastAPI
6 yr.
Django REST framework
SQLAlchemy
SQLAlchemy
Docker
Docker

Bio Summary

  • Engineer with 6+ years leading backend development and architecture of AI-driven microservice platforms in fintech, e-commerce, and digital content.
  • Expert in Python, FastAPI, Django, event sourcing, and cloud-native solutions (AWS, GCP, Kubernetes), delivering scalable, real-time data processing systems.
  • Proficient in SQL/NoSQL databases, messaging queues (Kafka, RabbitMQ), containerization (Docker), CI/CD pipelines, and API integrations.
  • Skilled in agile methodologies, code quality enforcement, mentoring, and end-to-end project delivery of complex AI and fintech applications.

Technical Skills

Programming Languages Python
Mobile Frameworks and Libraries Crashlytics
Python Frameworks Django REST framework, FastAPI, Flask
AI & Machine Learning LangChain, n8n, OpenAI, Spacy
Python Libraries and Tools pytest
Data Analysis and Visualization Technologies ETL
Databases & Management Systems / ORM DBeaver, Microsoft SQL Server, MongoDB, Neo4j, NoSQL, SQLAlchemy
Industry Domain Experience Banking
Version Control BitBucket, Git, Github Actions
Message/Queue/Task Brokers Celery, Kafka, RabbitMQ
Deployment, CI/CD & Administration Dapr, GitLab CI
Virtualization, Containers and Orchestration Docker, Kubernetes
SDK / API and Integrations FastAPI, OAuth, Stripe
Methodologies, Paradigms and Patterns FDD, Kanban
Third Party Tools / IDEs / SDK / Services Microsoft Visual Studio Code, PyCharm
Web/App Servers, Middleware Nginx
QA, Test Automation, Security Postman, pytest, Selenium, Unit Testing
Logging and Monitoring Prometheus, Sentry
Mail / Network Protocols / Data transfer WebSockets
Other Technical Skills Stable Diffusion

Work Experience

Back-End Developer (Aively)

Duration: 0.5 years
Summary:
  • An AI-driven platform that enables users to train custom visual styles or characters in minutes and generate unlimited designs
  • The platform allows creators to remix and build upon each other’s work, with automated royalty distribution across multiple contributors
  • Users can instantly transform their creations into physical products through an integrated print-on-demand system, with built-in fulfillment and secure payments
  • The project focuses on empowering artists and creators to monetize their visual identity with minimal technical effort
Responsibilities:
  • Designed and implemented the overall system architecture for a scalable AI-driven creative platform;
  • Built the backend from scratch, ensuring high performance, scalability, and reliability;
  • Developed and maintained integrations with third-party APIs (AI services, payments, print-on-demand, etc.);
  • Established efficient communication layers between frontend, backend, and AI/ML components;
  • Designed APIs and data flows to support real-time design generation and publishing workflows;
  • Implemented robust error handling, logging, and monitoring for production stability.
Technologies: Python, FastAPI, OpenAI, Stripe, WebSockets, Anthropic API, PostgreSQL, Redis, Render, Runpod, Docker, SQLAlchemy, Celery, Sentry, Printful, GCP Buckets/CDN, AWS Rekognition

Team Lead | Back-End/AI Developer (Digital Content Ecosystem)

Duration: 2 years
Summary:
  • Developed an integrated content ecosystem that automatically collects, analyzes, and generates content from multiple digital platforms
  • The platform includes content extraction services, AI-powered content generation, knowledge graph analysis, and trend identification capabilities, enabling users to discover content relationships and generate new content based on trending topics
Responsibilities:
  • Creating system architecture;
  • Designed and implemented microservice architecture for content collection and processing;
  • Developed content extraction API for YouTube, Reddit, and news articles;
  • Created AI-powered content generation system using OpenAI APIs;
  • Built knowledge graph generation pipeline for entity and relationship extraction;
  • Implemented workflow management system for content processing;
  • Deployed services to Google Cloud using Docker containers;
  • Conducted code reviews and mentored junior developers;
  • Created comprehensive API documentation.
Technologies: Python, FastAPI, SQLAlchemy, Neo4j, OpenAI, LangChain, Firebase, Google Cloud, PostgreSQL, Redis, Websockets, SERP, ZYTE, RapidAPI, Cloud Run Run/Job/Function

Team Lead | Back-End Developer (Mental health chatbot)

Duration: 0.5 years
Summary:
  • Chatbot designed to help people with mental health problems
  • It consists of a well-trained large language model that is secure
  • The bot can interact with users verbally and by text messages in real time, has memory of previous conversations, simulates natural conversation, and offers guided therapeutic exercises
Responsibilities:
  • Lead the architecture and development of an application with real-time market data integration;
  • Build scalable backend infrastructure to handle high-frequency data processing;
  • Define and enforce coding guidelines, development best practices, and efficient workflows to maintain code quality;
  • Prepare and maintain comprehensive technical documentation and project specifications;
  • Identify and resolve bugs, while optimizing system performance;
  • Review code contributions and provide mentorship to junior and mid-level developers.
Technologies: Python, FastAPI, SQLAlchemy, PostgreSQL, DynamoDB, S3, CloudFront, Docker, OAuth2, SNS /SQS, Lambda, RevenueCat, HLS, SQLAdmin, FFmpeg

Team Lead | Back-End/AI Developer - European digital services company (AI-Powered Web Ecosystem & Fintech Solutions)

Duration: 2 years
Summary:
  • Led the end-to-end development of several interconnected platforms including a high-load business information portal dynamically generating over 15 million pages, an AI-driven platform for automated website creation, and a mobile-first fintech application with real-time trading functionality, portfolio tracking, and multilingual investor communities
  • The projects focused on scalable delivery, automation, and seamless user experience
Responsibilities:
  • Architect and oversee the development of a mobile trading platform with real-time market data integration;
  • Design scalable backend systems capable of processing high-frequency financial data streams;
  • Establish coding standards, best practices, and development workflows for consistent high-quality code;
  • Project documentation and technical specifications;
  • Bug fixing and performance optimization;
  • Code review and mentoring junior/middle developers.
Technologies: Python, FastAPI, OpenAI, Stable Diffusion, Stripe, WebSockets, Anthropic API, Langchain, Google Search Console, PostgreSQL, Redis, Auth0, OVH, Postman, Prometheus/Grafana, Docker, SQLAlchemy, Celery, Polygon API, Sentry

Lead Back-End Developer (AI platform for automation of FinTech processes)

Duration: 1.5 years
Summary:
  • AI platform based on microservice architecture for automating document processing in a banking structure with artificial intelligence
  • The platform automates various banking processes such as seizing property, lending, and investing, speeding up work processes, reducing human error, and enabling faster application processing with fewer employees
Responsibilities:
  • Creating project architecture;
  • Implementing new backend features;
  • Refactoring existing backend code;
  • API integrations;
  • Development of microservices;
  • Adopting event sourcing for document processing;
  • Writing documentation;
  • Testing and debugging;
  • Code review.
Technologies: Python, FastAPI, PostgreSQL, MongoDB, Redis, Dapr, Docker, PyTest, Nginx, GitHub Actions, FastAPI-Amis-Admin, Kubernetes (k8s), Pycaret, SentenceTransformers, AutoGluon, Spacy, Trankit, N8N, Grafana, Prometheus

Education

  • Master’s degree
    Chernihiv National University of Technology, Chernihiv, Computer Science
  • Bachelor’s degree
    Chernihiv National University of Technology, Computer Science

Certification

  • Online Kubernetes Lab
  • KodeKlaud CTO Course
    CTO Academy
  • Mastering the System Design Interview
    Udemy
  • Django Pro
    Hillel IT school, Odesa
  • Python Advanced
    Hillel IT school, Odesa

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