Open to opportunities

Nazmul Hasan

@nazmulhasan3

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I build secure, high-scale backend and Web3 systems with Python, Go, and Solidity.

Australia

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What I'm looking for

I'm seeking a remote Web3, Blockchain, or Senior Software Engineer role where I can build secure, high-performance smart contracts and scalable on-chain systems.

I've built high-scale backend systems, AI-powered applications, and developer tools across VirtualFusion AI, Zelf AI, Andela, RemoteDevs.com, and CoDesign. My work spans Python, Go, Django, FastAPI, cloud-native infrastructure, and recent hands-on Solidity smart contract development.

At Zelf AI, I architected REST APIs and analytics pipelines supporting real-time enterprise dashboards, including time-series and sentiment analysis on a 60TB dataset that powered dashboards driving $2M+ revenue during the 2025 US election cycle. I also built embedding pipelines for an AI agent that determines brand engagement strategy and generates context-aware responses.

At VirtualFusion AI, I developed a Go-based penetration-testing agent integrating Nmap, OWASP ZAP, and Amass, alongside a concurrent custom port scanner. I also helped build tendering and MSP platforms, with the MSP portal supporting the rapid onboarding of the business's first 10 customers.

I've shipped open-source developer tools including LoadForge, a cross-platform Go load-testing CLI and web UI, and Auth Manager, a self-hosted Auth0-inspired authentication service. I'm looking to build secure, high-performance smart contracts and on-chain systems at scale.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

VirtualFusion AI

Sep 2025 - Jul 2026 (10 months)

Designed and developed a penetration-testing agent in Go, integrating open-source security tools for automated network reconnaissance and vulnerability scanning. Optimized token consumption by 20% and built an online tendering system with Stripe integration and an MSP portal.

Go Nmap OWASP ZAP Amass Docker CI CD GitHub Actions Infrastructure as Code

Backend Engineer

Zelf AI

Feb 2024 - Aug 2025 (1 year 6 months)

Architected high-performance REST APIs for analytics systems processing 40GB+ per table, and built time-series analytics and sentiment analysis pipelines on a 60TB dataset. Owned end-to-end backend infrastructure including Django, PostgreSQL, Redis, and Docker.

Python Django PostgreSQL Redis Celery Docker CI CD GitHub Actions REST APIs Time Series Analytics Sentiment Analysis

Full Stack Developer

Andela

Apr 2023 - Feb 2024 (10 months)

Developed LLM-integrated REST APIs based on FastAPI and built pipelines for user data to embeddings and diffusion models. Led frontend development team to build React UI components and integrated SSO authentication using Okta.

fastAPI Python React TypeScript AWS Amplify GitHub Pages Okta Sentry New Relic Data Scraping

Software Engineer

RemoteDevs.com

Jan 2021 - Mar 2023 (2 years 2 months)

Developed automated Shopify Ads campaign system and built Amazon Ads management platform using Domain-Driven Design. Created Twitter and Telegram automation bots using FastAPI.

Shopify Domain Driven Design fastAPI Python Automation

Software Engineer

CoDesign

Jan 2018 - Dec 2020 (2 years 11 months)

Developed corporate websites and E-learning platforms using Wagtail, Django, and Django REST Framework. Built content management systems with custom workflows and user authentication.

Wagtail Django Django REST Framework Python CMS API Integration Database Optimization