Mostafijur Rahaman

Mostafijur Rahaman

Senior Backend & Platform Engineer

Hyderabad, India

hello@mostafijur.in


About

Lead Backend & Platform Engineer with 10+ years of experience designing, building, and scaling high-traffic platforms across recruitment, SaaS, and education technology. I specialize in backend architecture, distributed systems, and platform engineering, where API design, database access, caching, search, and infrastructure decisions directly affect performance and reliability at scale. I’ve worked on platforms handling millions of requests and more recently have been building production Python/FastAPI services, AI-powered search and matching workflows, embeddings, and vector search. WHAT I DO: - Design and scale backend systems for high-traffic platforms - Own architecture decisions, code reviews, and engineering standards - Optimize APIs, databases, caching, search, and infrastructure - Modernize monoliths through clear service boundaries and incremental migration - Build Python/FastAPI services and AI/search workflows using embeddings and vector search - Improve production reliability through monitoring, incident response, and performance engineering - Mentor engineers and strengthen code quality and delivery practices BEYOND WORK: I’ve built products including ScholaBook, a SaaS-based school management platform, and WPVite, a managed WordPress automation platform. Building products end to end has shaped how I think about architecture, reliability, scalability, operational complexity, and long-term maintainability. I prefer first-principles thinking: understanding the problem, constraints, and trade-offs before choosing the architecture or technology.

Skills
Python
JavaScript
PHP
PostgreSQL
MongoDB
Docker
CI/CD
System Design
Kubernetes
Google Cloud
AWS
VectorDB
ElasticSearch
Experience

Lead Software Engineer

DrJob FZ LLC (Abu Dhabi, UAE)

Apr 2022 to Aug 2026
  • - Owned backend and platform engineering for a multi-country recruitment platform handling about two million requests per day; led architecture, APIs, code reviews, mentoring, releases, and incident response, improving average PR review turnaround by 75%.
  • - Built production Python/FastAPI services for AI-powered recruitment, including candidate matching, resume processing, and job-title normalisation.
  • - Designed hybrid candidate search using Elasticsearch keyword filtering, Qdrant vector search, structured scoring, and OpenAI and Sentence Transformers embeddings.
  • - Built Redis/RQ indexing and AI-processing pipelines with worker fan-out, distributed locks, retries, failure isolation, LLM fallback, and token, cost, and latency logging to keep Elasticsearch and Qdrant synchronized.
  • - Reduced monthly AWS spend by 37%, from USD 12.8K to USD 8.1K, through right-sizing and caching; cut latency for key APIs by 36%, from about 550 ms to 350 ms.
  • - Scaled job ingestion from about 25,000 per month to 12,000 per day - about 14 times the previous daily throughput - while keeping search and filtering responsive.
  • - Modernized a high-traffic Laravel monolith through service boundaries, API contracts, and incremental rollout,
  • reducing deployment risk.

Senior Software Engineer

ThoughtGreen Technologies Pvt Ltd

Sept 2019 to Jan 2022
  • - Built and deployed Laravel/CodeIgniter admin portals and REST APIs for B2B/B2C clients across multiple domains.
  • - Built Python/FastAPI services with Pydantic models for API validation.
  • - Deployed Dockerized applications on GCP with CI/CD pipelines, improving deployment reliability

PHP Developer

KernelSphere Technologies Pvt Ltd

Jun 2016 to Jul 2018
  • Built an LMS and administration dashboard supporting paid courses, video streaming, certificates, trainer
  • assignments, subscriptions, and user management for 500+ students.

PHP Web Developer

ZAKTAG Retail

Aug 2014 to Jun 2016
  • Maintained a Magento 1.9 platform through database and caching optimization plus marketplace API integrations for catalog synchronization and automated inventory management.
Projects

ScholaBook - School Management Platform

- Designed and built a modular Laravel-based school-management SaaS used by 250+ schools, managing 200K+ student records and INR 150M+ in fee-management workflows across 25+ operational modules. - Established backend and database architecture with clear domain boundaries, role-based and multi-campus access, payment and messaging integrations, reporting, and scheduled operational workflows.

Python/FastAPI
Laravel
MySQL/MariaDB
AWS

WPVite - Managed WordPress Automation Platform

- Architected a managed WordPress SaaS platform that automates isolated site provisioning across hosting, databases, Cloudflare DNS, S3 template restoration, WordPress configuration, WP-CLI, and SSL. - Designed a service-oriented provisioning architecture separating the Laravel platform from long-running server automation, with sta

Python
Laravel
WordPress
AWS
Cloudflare
WP-CLI
Education

B.Tech

North East Frontier Technical University (NEFTU)

Aug 2015 to Jul 2019