Senior Software Engineer with 8+ years across backend development, cybersecurity and networking. I build production systems in Python (Django, FastAPI) and Node.js on PostgreSQL, and I secure them — from the application layer down to the firewall. I have delivered for companies and clients in Bangladesh, the USA and Sweden, mostly in fintech, logistics and SaaS.
Beyond writing software, I can stand up a company's entire IT footprint: network design, server hardening, access control, and custom business systems such as ERP and management platforms.
class JeweleIslam:
"""Senior Software Engineer — backend systems, built and defended."""
title = "Senior Software Engineer"
experience = "8+ years"
location = "Dhaka, Bangladesh"
markets = ["Bangladesh", "USA", "Sweden"]
domains = ["Fintech", "Logistics", "SaaS"]
certified = ["CHFI", "Cyber Security Specialist", "AI/LLM Security Specialist"]
def core_stack(self) -> dict[str, list[str]]:
return {
"backend": ["Python", "Django", "FastAPI", "Node.js", "Express", "NestJS"],
"data": ["PostgreSQL", "MySQL", "Redis", "Amazon RDS"],
"platform": ["Docker", "Nginx", "AWS", "Linux", "CI/CD"],
"security": ["VAPT", "Incident Response", "Malware Analysis", "IAM"],
}
def also_handles(self) -> list[str]:
return ["LAN/WAN design", "Firewall & VPN", "Server hardening", "ERP systems"]
def status(self) -> str:
return "Open to freelance projects and full-time roles 🚀"|
Fixed-scope gigs — backend builds, security audits, malware cleanup, server setup. |
Long-term contracts — dedicated backend engineering and ongoing security retainers. |
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🗓️ 11+ years freelancing across Upwork, Fiverr and Elance — serving international clients since 2012.
| Service | What's included |
|---|---|
| 🐍 Backend Development | Django / FastAPI / Node.js applications, REST APIs, microservices, third-party integrations |
| 🗄️ Database Engineering | PostgreSQL schema design, query tuning, migrations, Redis caching, Amazon RDS |
| 🕷️ Data Scraping Pipelines | Large-scale collection, parsing and processing pipelines with monitoring |
| 🛡️ Security Audits & VAPT | Vulnerability assessment, penetration testing, remediation reports |
| 🦠 Malware Removal | Infected web server cleanup, blacklist recovery, post-incident hardening |
| 🌐 Networking & IT Setup | LAN/WAN design, router & firewall configuration, VPN, monitoring |
| 🖥️ Server Administration | Linux & Windows servers, Docker, Nginx, deployment and maintenance |
| 📊 Custom Business Software | ERP and management systems built around your actual workflow |
| 🤖 AI/LLM Security | Agent and LLM application security review, prompt-injection hardening |
Languages & Frameworks
Databases & Caching
DevOps & Cloud
Cybersecurity
Networking & Infrastructure
Architecture & Tooling
|
|
🎓 I also spent 8 years as a Cybersecurity Trainer, teaching vulnerability assessment and secure application development to students and working professionals.
2024 ─── Sep 2024 – Oct 2025 Back End Engineer Bilregistret Sverige AB 🇸🇪 Sweden (Remote)
2023 ─── Mar 2023 – Aug 2024 Senior Software Engineer Registration LLC 🇺🇸 California, USA (Remote)
2016 ─── Aug 2016 – Feb 2023 Senior Software Engineer Arena Web Security 🇧🇩 Dhaka, Bangladesh
2015 ─── Jan 2015 – Feb 2023 Cybersecurity Trainer Arena Web Security 🇧🇩 Dhaka, Bangladesh
2012 ─── Jan 2012 – Jan 2023 Freelance Dev & Security Upwork / Fiverr / Elance 🌍 Remote
📌 Expand role details
Back End Engineer — Bilregistret Sverige AB · Sweden (Remote) · Sep 2024 – Oct 2025
- Built and maintained backend applications using Node.js and Python
- Designed PostgreSQL databases and tuned them for better performance
- Developed data scraping pipelines to collect and process vehicle information
- Handled application security, reliability and scaling
- Worked remotely with the Swedish team to plan and release new features
Senior Software Engineer — Registration LLC · California, USA (Remote) · Mar 2023 – Aug 2024
- Developed software solutions for US-based clients as part of a remote team
- Focused on code quality, scalability and on-time delivery
- Ran code reviews and guided junior engineers on best practices
Senior Software Engineer (Django & FastAPI) — Arena Web Security · Dhaka · Aug 2016 – Feb 2023
- Led development of secure web applications using Django and FastAPI
- Built RESTful APIs to industry standards for security and performance
- Added authentication, access control and encryption to protect user data
- Set up threat detection and prevention systems that noticeably reduced client security incidents
- Worked in Agile/Scrum with regular code review and testing
- Mentored junior engineers; recognised by management for quality and problem solving
Cybersecurity Trainer — Arena Web Security · Dhaka · Jan 2015 – Feb 2023
- Trained students and professionals in cybersecurity, vulnerability assessment and secure development
- Removed malware from web servers; secured client networks, firewalls and access controls
- Participated in bug bounty programmes and reported security vulnerabilities
Freelance Software Developer & Security Specialist — Upwork / Fiverr · Remote · Jan 2012 – Jan 2023
- Completed many development and security projects for international clients over 11 years
- Started in SEO in 2012, then moved into Python development and cybersecurity
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🗣️ Languages: Bangla (native) · English (professional working proficiency)
| 📄 | How to Deploy a Django Project to a Heroku App — a step-by-step deployment walkthrough |
More write-ups on Django, FastAPI, application security and AI/LLM security are on the way.
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💬 Open to senior backend roles, security engagements, and freelance projects — remote worldwide.
"Ship it secure, or don't ship it."