Sina Jokar

Python Backend Engineer (Contract) @ Freelancer.com

About

Backend Software Engineer focused on building robust, scalable, and high-performance systems using Python (Django/FastAPI). I bridge the gap between "code that works" and "code that scales," with a strong emphasis on clean architecture and production readiness. My approach is defined by "Architectural Precision"—solving bottlenecks before they impact the user and writing maintainable code that grows with the product. 🚀 Professional Impact & Key Achievements: 🔹 Performance Optimization: Reduced API response times by 50% in high-traffic endpoints through effective caching strategies (Redis) and query optimization. 🔹 Database Efficiency: Eliminated 40% of query overhead in PostgreSQL by refactoring ORM lookups (solving N+1 problems) and implementing proper indexing. 🔹 Scalable Systems: Built Dockerized environments and decoupled services to ensure lightweight and rapid deployments (30% payload compression). 🔹 Reliability & CI/CD: Established automated testing workflows (TDD) and CI/CD pipelines (GitHub Actions) to minimize bugs in production. 🛠 Technical Stack & Toolkit: To help recruiters find me, here is my detailed tech stack: Languages: Python, SQL, Bash. Frameworks: Django, Django REST Framework (DRF), FastAPI, Flask. Databases: PostgreSQL, Redis, Elasticsearch. DevOps & Cloud: Docker, Kubernetes (Basic), CI/CD (GitHub Actions), Nginx, Linux. Concepts: RESTful APIs, Microservices, Monolithic Architecture, System Design, Design Patterns. Tools: Git, Celery, RabbitMQ, Swagger/OpenAPI, Jira, Postman. I am eager to bring this technical rigor to a forward-thinking team where I can contribute to challenging backend problems and continue growing. 🌍 Open to Remote roles or Relocation to Europe (EU) / Turkey (TR).

Country

Türkiye

City

Istanbul

Industry

Information Technology & Services

Skill

Python (Programming Language), Django, Django REST Framework, FastAPI, Docker, Redis, RESTful API Design, GitHub Actions, Microservices, PostgreSQL, MySQL, python skill assessment, pytest, Git, Agile Methodologies, Unit Testing, Software Development, Postman API, Test-Driven Development, Scalability

Experience

Python Backend Engineer (Contract)

Freelancer.com

2025-7 - 2025-12 · 6 mos

Focused on high-impact backend optimization and system hardening for diverse clients. 🚀 Key Deliverables: 🔹 Performance Tuning:Reduced API latency (p95) by 30% through advanced query optimization and index tuning. 🔹 System Stability: Eliminated critical defects and achieved Zero Regression releases by implementing comprehensive test suites (pytest). 🔹 Security: Hardened public-facing endpoints with rate-limiting, strict input validation, and secure authentication flows. 🛠 Tech Stack: Python, Django REST Framework (DRF), FastAPI, PostgreSQL, GitHub Actions.

Backend Software Engineer

Independent Consultant

2024-9 - 2025-12 · 1 yr 4 mos

Türkiye

Architected and deployed production-ready scalable systems, focusing on clean architecture and database performance. 🚀 Engineered Projects (Real-Estate CMS & E-commerce Core): 🔹 Database Architecture: Designed normalized relational schemas (3NF) ensuring strict data integrity and efficient M2M relationships. 🔹 High-Performance APIs: Built lean DRF endpoints handling complex filtering/pagination, reducing payload size by ~30%. 🔹 DevOps & CI/CD: Established automated deployment pipelines via GitHub Actions, reducing deployment time by 70%. 🔹 Security: Implemented RBAC (Role-Based Access Control) and JWT authentication for secure multi-user environments. 🛠 Tech Stack: Python, Django, Redis, Docker, PostgreSQL, Linux, Celery.

Python Backend Developer

فنی و مهندسی نیرو صنعت تاوا

2021-5 - 2024-8 · 3 yrs 4 mos

Tehran, Tehran Province, Iran

Worked as a full-time Python Backend Developer, contributing to the development and maintenance of core software systems. 🚀 Key Responsibilities & Achievements: 🔹 Backend Engineering: Built and maintained scalable RESTful APIs using Python, Django, and FastAPI, ensuring high performance and reliability. 🔹 Database Management: Designed efficient database schemas and optimized SQL queries to handle complex data relationships. 🔹 Code Quality: Focused on writing clean, maintainable code and conducting code reviews to ensure industry best practices. 🔹 System Optimization: Identified bottlenecks and improved application response times through backend tuning and caching strategies. 🏆 Professional Recognition: Recognized for strong technical problem-solving skills, teamwork, and consistent delivery of high-quality software solutions. 🛠 Tech Stack: Python, Django, FastAPI, PostgreSQL, Git, Linux.