Handheld air quality monitor
Engineering capstone, RMIT
A battery-powered monitor for CO, NO₂, PM2.5 and PM10 with an LCD readout, LED warnings and a ThingSpeak cloud dashboard.
Udana
Jayasekara
Engineer with three RMIT degrees and a habit of building the thing: robots, embedded boards, manufacturing systems and full-stack apps. Based in Melbourne and open to roles anywhere in Australia.
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Each project page includes a fault log: what went wrong on the bench, and how it got fixed.
Aptinex: hardware that shipped
Embedded System Development Engineer, Aptinex (Pvt) Ltd, Sri Lanka
Five hardware and firmware modules taken to production-ready design, plus LED disk firmware and batch testing of hundreds of modules.
Smart transportation robot
Engineering Design 3A, RMIT
An autonomous warehouse-style robot that follows a line, stops for obstacles and uses OpenCV to deliver cargo to the right station.
Self-balancing robot
Control Systems project, RMIT
A two-wheeled inverted pendulum, modelled and simulated in MATLAB/Simulink, then built and tuned until it balanced on the bench.
Digital twins from photogrammetry
Master's research thesis, RMIT
A workflow for turning overlapping photos into data-infused digital twins, and a map of exactly where the technique breaks.
DAAP: blockchain token payments
Industry capstone, Master of IT, RMIT
Added a DAX token payment system to an existing AWS-hosted digital asset authentication platform, alongside its Stripe payments.
Automated sorting cell
Automated System Design project, RMIT
Software and control for a three-station PLC cell that queues, picks and sorts cylindrical parts by material and surface.
Industrial monitoring and control
Industry 4.0 Technologies, Master of Engineering, RMIT
Virtual PLC logic in Structured Text, wired to a Node-RED dashboard over Modbus and MQTT, from sensor to screen.
Printer benchmark and manifold redesign
Advanced Manufacturing and Design, RMIT
A benchmark part that found the limits of the university's FDM printers, and a hydraulic manifold redesigned to print with minimal support.
Wheel changing device, DFA redesign
Design for Assembly and Automation, RMIT
An owner-assisted wheel changing device, redesigned with Boothroyd–Dewhurst analysis to cut assembly time and cost by 68%.
Optical mouse, DFMA redesign
Design for Manufacture and Assembly project
A product teardown and Boothroyd–Dewhurst redesign that took an optical mouse from 18 parts to 7 and from 287 to 29 seconds to assemble.
Gearbox design and FEA
Mechanical Design, RMIT
A single-speed 8:1 gearbox in SolidWorks, validated with motion analysis and shaft FEA that pinned the keyway as the critical stress point.
TeachTeam tutor recruitment
Full-Stack Development, Master of IT, RMIT
A recruitment platform built end to end: data model, authentication, application workflows and lecturer-side selection with reporting.
Weighted maze generation and solving
Algorithms and Analysis, Master of IT, RMIT
Kruskal-generated mazes solved with Dijkstra, brute-force DFS and a greedy heuristic, benchmarked to find where speed stops beating optimality.
AVR traffic light controller
Embedded Systems project, RMIT
A bare-metal C intersection controller on AVR: a finite state machine with timers, interrupts, right-turn sensing and countdown displays.
More projects
- Industrial robot offline programmingRAPID programs for an ABB IRB120 in RobotStudio covering welding, deburring, milling and drilling, with an external positioner for a workpiece beyond the standard envelope.
- Cantilever seat support for L-PBFA train seat bracket recreated in CAD, baselined with FEA, then lightened for laser powder bed fusion with alloy selection, build orientation and support planning.
- Logistics and operations analysisA distribution network across plants and international demand centres, comparing truck, rail and ship flows with fleet sizing and queueing-based capacity recommendations.
- CodeQA platform engineeringRequirements, layered architecture and UML through to Java post and comment handling with rule-based validation and JUnit 5 coverage.
- The Reading RoomA console bookstore rebuilt as a JavaFX desktop app with JDBC persistence, MVC, cart and checkout, CSV order export and admin stock management.
- Web and AI security analysisSQL injection and stored XSS against deliberately vulnerable services, an automated XSS worm, and JSMA and Carlini–Wagner attacks on image classifiers.
- COVID-19 vaccination databaseER modelling, normalisation and analytical SQL across locations, age groups and manufacturers.
- Clean-up management appAn Android app with map markers, search and filter, and Firebase authentication with role-based access.
- BuddyMove preference predictionDecision Tree and KNN classifiers compared with confusion matrices.
- ARL website usability evaluationModerated remote think-aloud testing with statistical analysis and UX recommendations.
Experience
Jan 2023 – present
Team Member
Woolworths Group, Melbourne
Continuous part-time work across grocery, nightfill and fresh food while completing two full-time master's degrees.
Sep 2021 – May 2022
Electronics and Design Engineer (Trainee)
Nemark Technologies, Sri Lanka
Supported the design and configuration of solar power generation systems, including component selection and system layout.
Feb – Aug 2021
Embedded System Development Engineer
Aptinex (Pvt) Ltd, Sri Lanka
Five hardware and firmware modules from requirements to production-ready design: an I2C bus extender, a SIM800 GSM module, ATtiny13 dimmer firmware, an RTC driver library and a BLDC controller architecture.
Education
Master of Information Technology
RMIT University, Melbourne, 2024 – 2025
GPA 3.6 / 4.0
Master of Engineering (Manufacturing)
RMIT University, Melbourne, 2023
GPA 3.8 / 4.0
Bachelor of Engineering (Robotics and Mechatronics) (Honours)
RMIT University Vietnam, 2019 – 2021
GPA 3.3 / 4.0
Member of Engineers Australia since 2021, skills assessed as a Mechatronics Engineer.
Toolkit
Embedded
- Firmware
- C and C++ (bare-metal and Arduino), AVR, ATtiny13, ESP8266, Atmel Studio, interrupts and timers, state machines, zero-cross and TRIAC control, low-power sleep/wake, driver libraries
- Electronics
- Schematic capture, PCB/PCBA layout and routing, bring-up, circuit debugging, soldering, component selection, BOMs, voltage regulation, Proteus, Fritzing
- Interfaces
- I2C (incl. P82B715 bus extension), UART, SPI, GSM (SIM800), RTC modules, LoRa, IMU, ultrasonic and IR sensing, ThingSpeak
Mechatronics
- Robotics
- ABB RobotStudio and RAPID, offline programming, tool and workobject frames, reachability analysis, OpenCV vision, Raspberry Pi
- Control
- Transfer functions and linearisation, PD/PID design and tuning, MATLAB/Simulink, PLC ladder logic, Structured Text, pneumatics, vacuum handling, e-stop and fault handling
- Design
- SolidWorks, Fusion 360, Inventor, AutoCAD, FEA, motion analysis, 3D printing, laser cutting
Manufacturing
- Methods
- DFMA and DFA, Boothroyd–Dewhurst analysis, design for additive manufacturing, assembly time and cost estimation, process improvement, queueing analysis
- Industry 4.0
- OpenPLC, e!COCKPIT, Structured Text (IEC 61131-3), Modbus, MQTT, Node-RED dashboards, digital twins
- Additive and digital
- L-PBF, FDM, build orientation and supports, Z-Suite, Bentley iTwin Capture Modeler and ContextCapture, photogrammetry
Software
- Languages
- TypeScript, JavaScript, Java, Python, Kotlin, SQL, C, C++
- Web and cloud
- React, Node.js, Express, REST APIs, TypeORM, JDBC, AWS Amplify, Lambda, DynamoDB, S3, Docker, Linux, Git
- Practice
- Data structures and algorithms, OO design and patterns, UML, agile sprints, JUnit 5, MySQL, MongoDB, security testing, Decision Tree and KNN
Why I make things
I chose robotics and mechatronics because I wanted to build machines, not just draw them. The parts I enjoy most are the messy ones: a robot that will not balance until the gains are retuned on the bench, a custom PCB that works on screen but not in the box, or a print that sags until the design changes. Fixing those problems is how I learn fastest.
At Aptinex I spent my days soldering, flashing and testing boards that went out to real customers. Since then I have added a master's in manufacturing and another in IT, so I can follow a product from the circuit to the production line to the software that runs on top of it.
Next on my bench: a small solar-powered LoRa sensor node for monitoring soil moisture and temperature in the field, combining the LoRa gateway work from Aptinex with the sensing, enclosure design and 3D printing from my air quality monitor.
Early builds
A robotic arm and a grid-solving robot from 2017, a can crusher cut and welded by hand, and Battleship on a 16×2 LCD.
Servo robotic arm with sonar ring detection 
Grid-solving robot on the line grid 
Can crusher: cut, welded, ground and polished by hand 
Battleship game on a 16×2 LCD
Let's talk
I am looking for graduate and junior roles in electronics, mechatronics, manufacturing and software engineering, anywhere in Australia. Full Australian working rights, no sponsorship required.