Brian Tjahjadi

Software Engineer

About Me
Blog
Experience

Experience

oNex

Software Engineer Intern

Apr 2025 - Dec 2025 ☆ Sydney, AU

  • Architected and implemented data pipeline for ingesting and preprocessing mobile time-series data on AWS and railway, supporting continuous online learning of downstream ML models.
  • Built personalized content-based recommendation service with Python, embedding models, and vector databases for fast ANN vector search and tailored user recommendations, integrating with our backend using gRPC.
  • Rewritten non-composited CSS animation background on landing page using WebGL2, delivering GPU-accelerated graphics and eliminating lag on low-spec devices.
  • Collected user feedback and proposed landing page improvements to boost engagement; implemented features using Astro, TypeScript, TailwindCSS, and SolidJS via an island architecture.

Sydney Interplanetary Rover Initiative (SIRI)

Software Engineer

Apr 2024 - Dec 2025 ☆ Sydney, AU

  • Passed the Australian Rover Challenge (ARCh)'s critical design review stage at the first year of attending the competition, accepted into the upcoming system acceptance review.
  • Led development of base station control panel for remote command and telemetry of our flagship rover using Foxglove, React, and ROS2.
  • Implemented rover's autonomous AI in the form of a behavior tree using BehaviorTree.CPP and BehaviorTree.ROS in C++.
  • Developed ROS2 C++ controllers for autonomous and manual rover steering (spin and 4-wheel convergent ackermann) alongside ESTOP and keep alive mechanisms for rover safety using Python and C++ ROS2 nodes.
  • Upgraded simulation and deployment workflows to follow ROS2 best practices (upgrading to Python, xacro urdfs, docker).

USYD Cybersecurity Society

Software Engineer

Aug 2024 - Jan 2025 ☆ Sydney, AU

  • Built Django REST API endpoints to serve team and member data from PostgreSQL.
  • Added tooling to auto-generate database schema diagrams, improving internal documentation.

Sydney Institute for Astronomy (SIfA)

Undergraduate Research Assistant

Mar 2024 - Jun 2024 ☆ Sydney, AU

  • Created automated data retrieval and crossmatching Python program using the Astroquery CASDA API to investigate viability of exoplanet detection by radio waves, found 2 candidate planetary systems satisfying criteria.

Sydney Institute for Astronomy (SIfA)

Undergraduate Research Assistant

Sept 2023 - Jan 2024 ☆ Sydney, AU

  • Analysed MEERKAT radio telescope time series data using pandas, numpy, and matplotlib to document changes from a particular fast radio burst (FRB) from 2019 to 2022, narrowing down theoretical models for the FRB's source.

Coles Group

Service and Trolleys Team Member

Mar 2023 - Sept 2023 ☆ Sydney, AU