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Seongwonp/README.md
Seongwon Park β€” Backend Systems and Platform Engineering

Portfolio LinkedIn Velog Email

I build backend systems, then stay around to see how they behave.

FastAPI and Spring Boot are my usual tools.
I enjoy the part after β€œit works”: deployment, load testing, failure analysis, and the next iteration.

λ§Œλ“€κ³  끝내기보닀, 직접 μš΄μ˜ν•˜κ³  μΈ‘μ •ν•˜λ©΄μ„œ λ‹€μŒ κ°œμ„ μ μ„ μ°ΎμŠ΅λ‹ˆλ‹€.


01 / WHAT I BUILD

πŸš— Streaming systems

MQTT, Kafka, time-series storage, consumer design, and load tests that check the final stored resultβ€”not just queue health.

πŸ“„ Deterministic pipelines

Parsers, layout engines, stable IDs, snapshot tests, and one-way data flows with explicit layer boundaries.

πŸ” Reliable web services

Authentication, payments, async workers, caching, monitoring, recovery paths, and security-conscious API design.

02 / SELECTED WORK

Telemetrix Β· Java

Vehicle telemetry platform built around MQTT β†’ Kafka β†’ storage and anomaly consumers.

load testing architecture decisions time-series data

Found a silent 50% data-loss bug and recovered storage throughput to 98.5% of target.

Han-Flow Β· TypeScript

Read-only macOS HWPX viewer with a one-way parser β†’ layout β†’ paint β†’ PDF pipeline.

parser boundaries deterministic IDs visual regression

The parser never knows React; the layout engine never knows ZIP or XML.

HoneyRest Β· Java

Booking platform split across user, host, and admin applications. I led service integration and shared database design.

Spring Boot team leadership system integration

Three applications, one product flow, and a lot of debugging at the seams.

AIDA Β· Python

Training-data quality experiment using KITTI, YOLOv8, and 13 injected error conditions.

experiment design FastAPI React dashboard

Experiment, backend, and frontend are connected by one explicit CSV contract.
More things I have built
  • Touch Bridge β€” accessible IoT interface for existing home appliances
  • No-Click β€” AI-assisted review analysis for promotional content and missing drawbacks
  • AI Exam Generator β€” a deployed exam-question service where I learned payments, workers, monitoring, and recovery
  • Go Practice β€” concurrency, HTTP, transactions, testing, and performance notes

03 / TOOLBOX

Backend & API

Java Spring Boot Python FastAPI Go

Data & messaging

PostgreSQL Redis Kafka MQTT InfluxDB

Build, ship & observe

Docker Linux Nginx Prometheus Grafana

04 / GITHUB IN MOTION

Seongwon's GitHub activity stats Languages across Seongwon's repositories
Seongwon's GitHub contribution timeline
How the language card is calculated honeyRest_host is excluded because it vendors about 11.4 MB of third-party JavaScript libraries under its static assets. The chart weights both code size and repository count; it shows repository composition, not a proficiency score.

05 / RIGHT NOW

studying       Information Security @ University of Suwon
measuring      telemetry throughput, stored-data integrity, and query bottlenecks
building       a deterministic HWPX rendering pipeline
learning       where backend design meets security, IoT, and product operations

Good systems are not just built. They are observed.

If you want to talk about backend systems, strange bugs, or an ambitious project:

Say hello

Pinned Loading

  1. SmartParking_System SmartParking_System Public

    Parking System Website Team Project

    Java 2

  2. honeyRest_user honeyRest_user Public

    🐝 HoneyRest 감성 μˆ™μ†Œ μ˜ˆμ•½ ν”Œλž«νΌ | μ‚¬μš©μž(User) μ‹œμŠ€ν…œ (Spring Boot + React + Redis + Firebase)

    Java 2

  3. CSAT_Forge CSAT_Forge Public

    Full-stack AI system that converts PDFs into structured CSAT exam questions

    Python 1

  4. kiosk_admin kiosk_admin Public

    (Final Version) Integrated smart cafe kiosk and admin dashboard built with Spring Boot.

    HTML 1