S
~300 metrics/min
Distributed monitoring platform with a central control plane and lightweight agents across 10 devices, ingesting ~300 metrics/min at ~0.5s latency.
JavaSpring BootPostgreSQLDocker
Read case study →Currently: Software QA Engineer (Co-op) at Oncoustics
Rai Umar
Software Engineer
I build and ship backend services, full-stack applications, and cloud deployed tooling. From a distributed Spring Boot monitoring platform to AWS migrations for production clients. I care about correctness, tested code, and software that holds up in production.
Featured Projects
Selected work — production-minded systems I designed, built, and tested end to end.
S
15.6 GB/min throughput
CLI file encryption utility using Argon2id + ChaCha20-Poly1305 streaming encryption, achieving 15.6 GB/min throughput on a single thread.
ClibsodiumGitHub ActionsSecurity
Read case study →E
0 blocking delays
Embedded sensor node with DHT22, OLED display, and buzzer alarms. Non-blocking scheduler with 2s sampling, 500ms UI refresh, and UART telemetry.
C++ESP32EmbeddedArduino
Read case study →Skills
Full-stack, backend, cloud, QA, and systems — the tools I reach for to ship and maintain software.
Languages
JavaCC++PythonTypeScriptJavaScriptSQLAssembly
Frontend & Web
ReactNext.js (App Router)Tailwind CSSHTML5CSS3MDXshadcn/uiOpenGraph / OG ImagesWCAG AA
UI Tooling
Framer Motionreact-hook-formZodlucide-react
Backend & APIs
Spring BootREST APIsJDBCPostgreSQLNext.js API RoutesNode.jsJWT / API KeysResend
Embedded & Hardware
ESP32STM32ArduinoI²C / SPI / UARTx86 AssemblyMotorola 68KWokwi Simulator
Cloud & DevOps
AWS EC2AWS S3AWS IAMAWS CloudWatchVercelCloudflare PagesDockerGitHub ActionsLinux / BashMaven
Testing & Quality
JUnitCheck (C)ASan / UBSancppcheckStatic AnalysisLog-driven DebuggingPostmangdb / lldb
Networking & Security
TCP/IPTLS/SSLSSHWiresharknmapCompTIA Security+
About Me
I design and build full-stack applications, backend services, and tested tooling. Currently working as a Software QA Engineer at Oncoustics, an AI-driven medical ultrasound startup in Toronto. Where I'm responsible for QA on clinical diagnostic software. I'm also completing my Software Engineering degree at the University of Guelph (3.9 GPA, April 2029).
My background spans a few different worlds: I've written low level C for streaming encryption and embedded sensor firmware, built distributed monitoring systems in Java and Spring Boot, and worked on AWS cloud migrations at a startup. I like the full picture, from the hardware up to the API layer.
More about me