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Behdad Sayadi
Software Engineer · Python & Backend Systems
Gorgan, Iran · Open to freelance & remote backend work
Backend-focused Software Engineer with 4+ years of experience building production-ready systems with Python, Django, PostgreSQL, Redis, and Celery. Experienced in backend architecture, REST and GraphQL API design, database design, asynchronous processing, and authentication. Comfortable owning systems end-to-end, from requirements and architecture through implementation and deployment, while leading multidisciplinary engineering teams.
skills
Technical skills
Languages
Python
SQL
C++
HTML/CSS
JavaScript/TypeScript
Backend
Django
Django REST Framework
FastAPI
SQLAlchemy
GraphQL
Graphene-Django
Data
PostgreSQL
MySQL
MongoDB
SQLite
Redis
Infrastructure
Docker
Docker Compose
Linux
Nginx
Gunicorn
Async Systems
Celery
Celery Beat
Background Processing
Task Scheduling
Engineering
REST APIs
Database Design
ORM Optimization
Performance Optimization
Authentication
Authorization
RBAC
Code Review
experience
Experience
Backend Developer
·
Freelance / Contract
2022 — Present · Remote
Python · Django · DRF · FastAPI · PostgreSQL · Redis · Docker
- Designed and delivered production-ready backend systems for multiple clients and industries, including four projects delivered through Developeria during 2024–2025.
- Architected and implemented secure REST APIs with Django REST Framework, covering authentication, permissions, validation, filtering, pagination, and role-based access control.
- Designed relational models and improved database performance through indexing, query optimization, and ORM-level profiling.
- Built asynchronous workflows with Celery and Redis for OTP authentication, background processing, and scheduled tasks.
- Developed GraphQL APIs alongside REST-based services, adapting API architecture to product requirements.
- Worked directly with clients and product teams to translate requirements into technical architecture, implementation plans, and production-ready systems.
Founder & Engineering Lead
·
Kaizen Dev Team
2024 — Present · Hybrid
Technical Leadership · Architecture · Code Review · Engineering
Workflow
- Founded and led a multidisciplinary software development team delivering web-based products from initial requirements through implementation.
- Defined backend architecture, engineering standards, repository structure, development workflows, and technical conventions.
- Reviewed implementations for maintainability, security, performance, consistency, and adherence to architectural standards.
- Coordinated backend and frontend development and translated product requirements into technical execution across the team.
projects
Selected project
Aphra.ir · Barber Discovery & Reservation Platform
2026 — Present
DRF · PostgreSQL · Celery · Redis · Docker
- Founded and built Aphra, a SaaS platform for discovering barbers, exploring services, and booking appointments.
- Owned the product's backend architecture and core data model, covering customers, barbers, salons, services, appointments, availability, media, authentication, and role-based access control.
- Designed and implemented the REST API layer with filtering, pagination, validation, permissions, media uploads, and reservation workflows.
- Designed the scheduling and availability system, implementing business-rule validation and safeguards against conflicting reservations.
- Implemented asynchronous infrastructure with Celery and Redis for OTP authentication, notifications, and background processing.
- Led product development end-to-end, contributing to backend, frontend, and UI/UX decisions while turning product requirements into a production-ready platform.
achievements
Competitive programming & achievements
languages
Languages
Persian
· Native
English
· Professional Working Proficiency
contact
Get in touch
Open to freelance projects, backend roles, and technical collaboration.