Available to hire
Hi, I’m Ali Sajadian, a Senior Software Engineer with over 15 years of experience delivering scalable desktop, web, and mobile solutions. I specialize in Python, Nest.js, and .NET, and I’m proficient in both Windows and Linux environments. I’m passionate about building robust, production-ready software and collaborating with cross-functional teams to translate requirements into reliable services.
I’m seeking a full-time remote role with European companies, available to work 40 hours per week in a flexible time zone. I enjoy architecting API-first microservices, designing resilient systems, and mentoring teammates while staying hands-on with code and delivery timelines.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Language
English
Advanced
Persian
Fluent
Work Experience
Senior Full-stack Engineer at Independent Contractor / Personal Projects
January 1, 2022 - January 1, 2025Architected and deployed production e-commerce platform with 7 microservices (Auth, Product, Order, Payment, Notification, Review, and Recommendation). Solo architect and developer; implemented event-driven architecture with Kafka and gRPC; built with FastAPI and Nest.js, PostgreSQL, MongoDB, Redis; deployed on Kubernetes with Traefik ingress; integrated Stripe payments and multi-channel notifications; applied CQRS, event sourcing, and saga patterns to ensure reliability and scalability.
Senior Back-end Engineer at Steel Structure Fabrication and Machinery Co.
January 1, 2024 - January 1, 2024Integrated legacy inventory system via VPN-secured API bridge across three locations; background service processing 1,000+ daily transactions with 99.8% accuracy; automated synchronization eliminating manual data entry (100% reduction) and secure API channels with end-to-end encryption.
Full-Stack Developer at EPC Holding Company
January 1, 2023 - January 1, 2023Project Reports Management System (PRMS): Centralized reporting platform aggregating construction data; RESTful API with RBAC; automated dashboards reduced executive reporting time by 80%; created a reusable component library with 30+ components.
Senior Full-stack Engineer at Asfalt Tous EPC Holding Co
January 1, 2015 - January 1, 2022Led development of internal software systems serving 500+ employees across 6 subsidiary companies; built in-house Restaurant Customer Ordering System; real-time Production Control System (PCS) with on-site hardware integration; improved operational efficiency and data visibility across sites.
Contract Software Engineer at Various Iranian Clients
January 1, 2008 - January 1, 2014Developed enterprise software for industrial, commercial, and educational clients; notable projects include Cost Control System (CCS) for EPC Construction; Enterprise Assessment Platform with 10,000+ question bank and automated grading; Shipping Management System for Irano Hind Shipping; delivered scalable, SQL Server-backed solutions.
Solo architect & Senior Back-end Engineer at Agentica
January 1, 2022 - January 1, 2025Designed microservices architecture (gateway, RAG, LLM inference, memory, and agent orchestration). Implemented RAG pipeline with 512-token chunking and embeddings via BAAI/bge-small-en-v1.5 and cosine search using Qdrant. Built multi-agent orchestration with LangGraph supporting task decomposition, parallel tool calls, and session memory. Containerized services with Docker Compose; Kubernetes manifests (k3s) for production deployment. Led backend development across core platform services.
Senior Back-end Engineer at E-commerce startup (NDA-protected)
January 1, 2025 - January 1, 2025Led development of an event-driven microservices platform (7 services) with Kafka and gRPC, handling authentication, product, order, payment, and notifications. Implemented Stripe payments and multi-channel notifications; containerized on Kubernetes with Traefik Ingress. Built AI-driven recommendations with sub-200ms API responses under 500+ concurrent users.
Senior Back-end Engineer at Asto Steel fabrication and Machinery Co.
January 1, 2025 - January 1, 2025Developed Production Tracking & Barcode Entry app enabling real-time PCS data entry and product tracing across four production stages. Implemented Android/Kotlin handheld app integration for real-time updates; improved data accuracy and traceability.
Senior Back-end Engineer at Steel Structure Fabrication & Machinery Co. (Remote)
January 1, 2024 - January 1, 2024Integrated legacy system with remote warehouse using secure API bridge across 3 locations. Implemented 1,000+ daily inventory transactions with 99.8% accuracy; VPN-secured API channels with end-to-end encryption and conflict resolution; automated synchronization eliminated manual data entry.
Senior Full-stack Engineer at Asfalt Tous EPC Holding Co
January 1, 2023 - January 1, 2023Led internal software development across multiple projects including a restaurant ordering system and production control workflows; implemented real-time data capture, reporting, and deployment improvements to support 500+ users.
Solo Full-stack Engineer at Asfalt Tous EPC Holding Co
January 1, 2021 - January 1, 2022Restaurant Customer Ordering System for employee meal scheduling; Django DRF, React, TypeScript, Redux, Bootstrap. Reduced ordering time from 15 to 2 minutes and cut food waste by 15%.
Senior Developer at Asfalt Tous EPC Holding Co
January 1, 2015 - January 1, 2017Production Control System (PCS – Desktop Version) for real-time MIS with 3,000+ daily production records; led 2 juniors; C#/.NET, MS SQL Server, Reporting Services, Windows CE; barcode-driven workflow.
Solo Software Engineer at EPC Construction
January 1, 2014 - January 1, 2014Cost Control System (CCS) for EPC Construction; improved reporting accuracy by 50%; C#/.NET.
Software Engineer at Educational Institution
January 1, 2009 - January 1, 2010Enterprise Assessment Platform; 10,000+ question bank; performance optimizations and query improvements.
Software Engineer at Irano Hind Shipping
January 1, 2008 - January 1, 2009Shipping Management System; chartering and operations management; 40% faster contract processing.
Education
Bachelor of Applied Mathematics at University Azad-Karaj
January 11, 2030 - December 30, 2025Bachelor of Applied Mathematics at University Azad-Karaj
January 11, 2030 - June 8, 2026Qualifications
Industry Experience
Software & Internet, Computers & Electronics, Professional Services, Media & Entertainment, Education, Manufacturing, Other
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
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