Joshua Calba — Software Developer

A bit

About Me

I am a software developer whose main experience is in building full stack web applications. I love building things that people actually end up using, and I am expanding into mobile development as well.

Right now I am at CERN, working in the Cloud Infrastructure Team on tooling for a large OpenStack-based private cloud. That work has pulled me deep into backend engineering, API design and cloud infrastructure alongside the web development I started with.

Alongside that I am studying for my MSc in Computer Science, specialising in Robotics at the IT University of Copenhagen, because I wanted to know not only how to build software, but how to build something physical with it.

Where I work

Professional Experience

Job roles, my responsibilities and what I learned from them.

Cloud Engineering Intern

CERN · Cloud Infrastructure Team

Current role

Period

August 2026 – January 2027

Location

Geneva, Switzerland

Building cloud infrastructure tooling for a large OpenStack-based private cloud, centred on an Intervention Management Framework that models and coordinates infrastructure interventions and makes their impact on users visible before they happen.
- Designing and building an Intervention Management Framework for an OpenStack-based cloud
- Python backend with FastAPI, SQLAlchemy and Pydantic on top of a MySQL data model
- Integrating with the OpenStack ecosystem — Compute, identity and placement concepts
- CLI tooling, automated tests, containerised builds and GitLab CI/CD pipelines
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Student Developer

IBM · Second Year Project — Software Development in Large Teams

Period

February 2024 – June 2024

Location

Copenhagen, Denmark

Collaborated with IBM as part of ITU’s Software Development in Large Teams project, developing an MVP for an open-source platform that helps companies calculate CO₂ emissions from transportation through a working API.
- Developed an MVP in collaboration with IBM for calculating transportation-related CO₂ emissions
- Built around a working API that enables companies to calculate emissions from transportation data
- Worked in a larger software development team using Scrum and iterative development
- Gained experience collaborating with an external industry partner throughout the development process
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Media & IT

CBMBC · Media Ministry

Period

2019 - 2026

Location

Copenhagen, Denmark

Supporting the church's digital and media operations through live production, audiovisual systems, websites and social media. Responsible for technical systems used during weekly services and other church activities.
- Set up and coordinate multi-camera livestreams for weekly church services using YoloBox Ultra
- Operate and integrate cameras, audio, projector and presentation systems during live productions
- Maintain the church and annual church-camp websites
- Create, edit and publish video content for the church's social media
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Personal & academic work

Featured Projects

Projects I have built

All 4 projects

Personal Live

Church Camp Website

Full stack web application

A full stack web application where campers sign in and pay their camp fees online, with payments handled through the Nets Easy API.
View project
Academic Completed

Group Formation Algorithm

Bachelor’s thesis project

A constraint-based optimisation algorithm that creates fair and balanced teams based on participants’ skills, backgrounds, and grouping requirements, developed for an annual church camp as my bachelor’s thesis.
View project
Academic Completed

Autonomous Connect Four Robot

Robotics, embedded systems & mechanical design

Designed and built a physical Connect Four robot that detects a human player's moves, chooses its own response, and autonomously positions and dispenses game pieces.
- 3D
View project