Marcus Belcastro

Employment & Work Experience

Senior Software Engineer

Weel • 2023 — 2026 (3 years)

Full-stack dev, fintech, focus on product features, ISO/SOC, and DevOps/SRE.
Direct report to the CTO and Head of Eng.
Python Django, React, React Native, Next.js, AWS, Cloudflare, Terraform, GraphQL, Postgres, MongoDB.
Solo projects: Customer-facing micro-service, and an internal admin panel used by whole business.
Led multiple zero-downtime upgrades: Python/React/React Native versions, Postgres, Docker, Infra migrations, EC2 → Fargate.
Lead ISO/SOC compliance engineer. Got engineering from 0 → 100% compliance in <1yr.
Created the DevOps function and headed the DevOps Team.

Mid-level Software Engineer

Instawork • 2023 (6 months)

Implemented product changes to enhance business user experiences and growth.
Python Django, DRF, React, TS, Bootstrap, Hyperview, Mode, Datadog, AWS, Terraform, Docker, SQL, Celery, Salesforce, Jest, Nightwatch, OpenAPI, OpenAI.
Delivered BI pipeline from backend to Salesforce for sales insights.
Drove security initiatives: patched critical vulns and updated dependencies.

Co-Founder & Technical Lead

Yora Settlements • 2019 — 2023 (3 years)

Co-founded and built a cryptocurrency trading platform end-to-end.
Designed core backend micro-services in Python on Linux.
Managed contractors; owned 4 REST APIs (Flask + OpenAPI), public and private.
Implemented robust security: firewalls, VPNs, scoped permissions, encryption.
Built testing across units/endpoints/performance; administered SQL hosting and AWS.
Published Python library improving transactional throughput 5x.

Co-Founder & Technical Lead

Western Sydney Software • 2022 (1 year)

Built serverless backends in Python on AWS (S3, Lambda, SQS, SES, API GW).
Security consulting and automation solutions for clients.
Managed contractors; authored proposals and plans for tenders.

Software Developer

Western Sydney University • 2022 (6 months)

Delivered a Unity C# application with feature and unit testing.
Built a Laravel REST API with SQL backend to manage app state.
Handled Linux system administration and deployments.

Qualifications & Education

Bachelor of Computer Science (Advanced) with Distinction

Western Sydney University • 2019 — 2021

Major in Cyber Security • GPA 6.7/7 • ACS Accredited Professional.

AWS Certified Developer — Associate

Completed in 2024

A bit about me

I'm a full-stack software engineer. I started tinkering with code as a teenager by blinking some LEDs on a Raspberry Pi with Python, and then my fascination has grown ever since, but I've always been interested in computers from the day that my dad bought our first ever family PC back when I was very young.

I very much have a love for computer infrastructure, especially commercial grade stuff, including cloud providers like AWS. I think the understanding of how code is shipped, executed, and gets to people is necessary to build reliable, quality software.

Some hobbies outside of computing: Reading, writing, hiking, go-karting, and endurance sports. I very much enjoy reading academic and scientific literature. It's an ongoing hobby of mine to learn about frontier technologies in science (including computing). I am also a massive fan of extreme motorsports like rally-car driving and gymkhana!