Anton Holud

Senior Full Stack Engineer

Avatar placeholder
Warszawa, Poland

Experience

Aug 2023 - Oct 2025
2 years 3 months
Warsaw, Poland

Senior Full Stack Engineer

eConsulting

  • Engineered Python backend development for enterprise data analytics platform processing 50M+ records daily using Django, FastAPI, and Celery.
  • Architected and implemented scalable RESTful APIs using Django REST Framework and FastAPI, reducing average response time from 380ms to 95ms through query optimization and caching.
  • Designed microservices architecture using FastAPI and Docker, enabling independent scaling and improving system reliability to 99.95% uptime.
  • Built high-performance data processing pipelines using Celery, Redis, and PostgreSQL, processing 10M+ tasks daily with 99.9% success rate.
  • Optimized complex database queries using Django ORM and raw SQL, implementing proper indexing and reducing query execution time by 70%.
  • Developed real-time data streaming service using WebSockets and Redis pub/sub, handling 200K+ concurrent connections.
  • Implemented comprehensive authentication/authorization system using Django Authentication, JWT, and OAuth 2.0, supporting SSO for enterprise clients.
  • Integrated machine learning models into production using Flask and FastAPI, serving predictions for 5M+ requests daily with <50ms latency.
Apr 2022 - Jun 2023
1 year 3 months
Tallinn, Estonia

Full Stack Engineer

DevLab Ltd

  • Developed and maintained high-traffic RESTful APIs using Django and Django REST Framework, serving 8M+ daily requests for SaaS platform.
  • Designed and optimized PostgreSQL database schemas with complex relationships, implementing efficient indexing and query optimization strategies.
  • Built real-time notification system using Django Channels and WebSockets, processing 500K+ events per hour with sub-100ms latency.
  • Created GraphQL API layer using Graphene-Django, reducing over-fetching and improving front-end performance by 35%.
  • Implemented microservices architecture for user management, payment processing, and analytics services using Flask and FastAPI.
  • Integrated multiple third-party APIs (Stripe, SendGrid, AWS S3, Twilio) for payment processing, email delivery, and file storage.
Feb 2020 - Mar 2022
2 years 2 months
Munich, Germany

Backend Developer

Intelligenz IT

  • Built scalable backend infrastructure from scratch using Django and PostgreSQL for fintech startup, handling 2M+ API requests daily.
  • Designed and implemented PostgreSQL database architecture with proper normalization, constraints, and relationships for financial transactions.
  • Developed secure authentication system using Django Authentication and JWT, implementing password hashing, session management, and token refresh.
  • Created RESTful API endpoints using Django REST Framework for mobile and web applications, following REST principles and best practices.
  • Integrated payment processing using Stripe API and Django, implementing webhooks for payment verification and subscription management.
Aug 2015 - Oct 2019
4 years 3 months
Białystok, Poland

Junior Python Developer

Softwarehut Ltd

  • Developed backend APIs and server-side logic using Python, Django, and Flask for client web applications.
  • Created and maintained PostgreSQL and MySQL databases, writing efficient queries and ensuring data integrity.
  • Implemented user authentication and authorization systems using Django Authentication and custom middleware.
  • Built RESTful APIs for e-commerce platforms, integrating payment gateways and third-party services.
  • Developed server-side rendering solutions using Django templates and Jinja2.
  • Wrote unit and integration tests using pytest and Django Test Framework, achieving 75% code coverage.
  • Participated in code reviews and learned best practices for clean, maintainable Python code.

Summary

Senior Full Stack Engineer with 10 years of expertise in Python backend development, specializing in Django, Flask, and FastAPI frameworks. Proven track record of building scalable RESTful APIs, microservices architectures, and data-intensive applications processing millions of records daily. Expert in database design, API optimization, and cloud infrastructure. Strong background in machine learning integration, data processing pipelines, and building robust backend systems for enterprise applications.

Skills

  • Languages: Html5, Css3, Javascript (Es6+), Typescript, Python
  • Back-end Core: Python 3.x, Django, Flask, Fastapi, Celery, Asyncio
  • Databases & Orms: Postgresql, Mysql, Sqlite, Mongodb, Redis, Dynamodb, Sqlalchemy, Django Orm
  • Api & Integration: Restful Apis, Graphene, Strawberry, Fastapi, Django Rest Framework, Websocket, Stripe
  • Data Processing & Ml: Pandas, Numpy, Scikit-learn, Etl Pipelines, Apache Airflow, Data Warehousing, Ml Integration
  • Front-end: React, Vue.js, Next.js, Django Templates, Jinja2
  • Cloud & Infrastructure: Microsoft Azure, Azure Devops, Docker, Kubernetes, Nginx, Iis
  • Devops & Ci/cd: Github Actions, Gitlab Ci, Jenkins, Azure Pipelines
  • Methodologies: Agile/scrum, Tdd, Bdd, Solid, Design Patterns, System Architecture

Languages

English
Advanced
Polish
Advanced
German
Elementary
Estonian
Elementary

Education

Apr 2011 - Mar 2015

NUS - National University of Singapore

Bachelor's degree, Computer Science · Computer Science · Singapore

Need a freelancer? Find your match in seconds.
Try FRATCH GPT
More actions

Similar Freelancers

Discover other experts with similar qualifications and experience

Robert Raźniewski
Robert Raźniewski

Software Developer

View Profile
Maciej Krawczyk
Maciej Krawczyk

Senior Backend Engineer & AI System Developer

View Profile
Hüseyin Korkut
Hüseyin Korkut

Senior Full-Stack Engineer

View Profile
Arseniy Buntury
Arseniy Buntury

Full Stack Developer

View Profile
Arne Hendricks
Arne Hendricks

Embedded Fullstack Developer

View Profile
Robert Malec
Robert Malec

Backend Developer

View Profile
Michal Budzyn
Michal Budzyn

Senior Golang Engineer

View Profile
Pawel Owerczuk
Pawel Owerczuk

AI AGENT Shopping assistant

View Profile
Martin Musiol
Martin Musiol

Product Owner AI Learning Platform

View Profile
Maxim Yafimau
Maxim Yafimau

DevOps

View Profile
Haseeb Ahmad
Haseeb Ahmad

Full Stack Ruby on Rails Developer

View Profile
Qaiser Abbasi
Qaiser Abbasi

Freelance Lead DevOps Engineer

View Profile
Fady Kuzman
Fady Kuzman

Senior Software Developer / Tech Lead

View Profile
Marcel Meyer
Marcel Meyer

Cloud-Architect, Senior Solution Architect, Senior Software-Engineer

View Profile
Thomas Stägemann
Thomas Stägemann

Rating System

View Profile
Satya Vulise
Satya Vulise

Lead Developer

View Profile
Piotr Ostrowski
Piotr Ostrowski

Senior Full Stack Developer

View Profile
Kiriakos Krastillis
Kiriakos Krastillis

Tech Lead: API Experience Platform

View Profile
Serge Kalinin
Serge Kalinin

MLOps (machine learning operations)

View Profile
Damian Śniatecki
Damian Śniatecki

CTO

View Profile
Frank Bohnsack
Frank Bohnsack

Software Engineer

View Profile
Jürgen Fey
Jürgen Fey

AR/VR/XR Architect

View Profile
Maksim Šetić
Maksim Šetić

Senior Full Stack Developer

View Profile
Kai Held
Kai Held

Backend Python Engineer

View Profile
Maurizio Fleischer
Maurizio Fleischer

Python Software Developer

View Profile
Anton Klonov
Anton Klonov

Head of Technical Overall Integration NSC / Hadoop Cloud Development

View Profile
Rainer Diekmann
Rainer Diekmann

Enterprise Architecture Management / Software Developer Backend

View Profile
Shamaila Mahmood
Shamaila Mahmood

Senior Software Architect

View Profile
Rodrigo Herrán
Rodrigo Herrán

Data Engineer and Founder

View Profile
Lukasz Czerwinski
Lukasz Czerwinski

Platform Lead

View Profile