Freelancers in Hwaseong-si

Freelancers in Hwaseong-siFreelancers in Hwaseong-si

Projects People

proGwangju-si, South Korea

Youthful & Timeless Logo Design

Youthful & Timeless Logo Design

Cover image for MIBLD Branding & Web design

MIBLD Branding & Web design

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Paperain Brand identity & Logo design

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1

LEVAIN.B Brand identity & Logo design

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5

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Incheon, South Korea

Creative Social Media Strategist & Rebrand Designer

Creative Social Media Strategist & Rebrand Designer

Cover image for Rebranding and Campaign Brainstorm for AALLYN

Rebranding and Campaign Brainstorm for AALLYN

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Cover image for The North of Saigon Passion Project

The North of Saigon Passion Project

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7

Cover image for Platinum Agency

Platinum Agency

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5

Cover image for The Gregory Burns Rebranding

The Gregory Burns Rebranding

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7

Hwaseong-si, South Korea

Senior Mobile App Developer with 25+ years experience

New to Contra

Senior Mobile App Developer with 25+ years experience

Cover image for Designed, developed, and published Stone

Designed, developed, and published Stone Grid as a solo Flutter developer. Stone Grid is a cross-platform Gomoku (Five in a Row) strategy board game featuring AI opponents, local multiplayer, multiple board sizes, hint systems, zoom controls, and customizable game rules. Built and maintained the entire application, including game logic, AI gameplay systems, board rendering, local state management, in-app purchases, advertising integration, and App Store / Google Play releases. Technologies: Flutter, Dart, SQLite, In-App Purchase, AdMob

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Cover image for Designed, developed, and published Sudoku

Designed, developed, and published Sudoku Heaven as a solo Flutter developer. Sudoku Heaven is a cross-platform puzzle application featuring multiple difficulty levels, daily challenges, statistics tracking, progress management, hint systems, and offline gameplay. Built and maintained the entire application, including puzzle generation and validation logic, local data storage, in-app purchases, advertising integration, game progression systems, and App Store / Google Play releases. Technologies: Flutter, Dart, SQLite, In-App Purchase, AdMob

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Cover image for Developed and published TraitTest, a

Developed and published TraitTest, a cross-platform personality assessment application built with Flutter. The app is based on the scientifically recognized Big Five personality model and provides personality analysis, MBTI-style type suggestions, visual result charts, and shareable result summaries. Implemented multilingual support, local data management, in-app purchases, result history, and a responsive user experience across iOS and Android. Technologies: Flutter, Dart, SQLite, In-App Purchase

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Cover image for Developed and maintained the BlackVue

Developed and maintained the BlackVue mobile application for iOS as a freelance mobile developer. Implemented and maintained key features including Wi-Fi Direct communication, live view streaming, video playback, cloud integration, authentication, and App Store releases. Technologies: Swift, Objective-C, BLE, REST API, Wi-Fi Direct, Apple Sign In, Google Sign-In, SQLite

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Anyang-si, South Korea

Data & AI-automation engineer: messy data to clean CSV/JSON

New to Contra

Data & AI-automation engineer: messy data to clean CSV/JSON

Cover image for A schema + range +

A schema + range + enum data contract with drift detection for tabular and sensor (rosbag) batches. It catches the batch that still parses but whose meaning changed - a firmware unit switch (Celsius to Fahrenheit), a new category, a sensor dropout - exactly what a naive did-it-parse gate ships. On the committed demo batch: the naive check reports 0 issues; the contract reports 36 violations plus drift (joint_temp mean 45 to 112, z=14.9) on the same data. Runs as a CI gate and names the cause, not the symptom; the clean batch passes untouched. Public code: github.com/jigonyoo/data-contract-guard

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Cover image for Raw lead and form submissions

Raw lead and form submissions become CRM-ready records: normalized, classified, scored hot/warm/cold, with a staff summary and reply draft - then routed by a verification gate. Trustworthy leads auto-flow to the CRM; uncertain ones go to a human-review queue. An LLM can label a lead; the value is knowing which to auto-route and which a human must see first - unreachable hot leads and ambiguous spam get caught, not dropped. Runs fully offline (deterministic) or with OpenAI. Public code: github.com/jigonyoo/ai-intake-qualifier

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Cover image for A FinOps pass over an

A FinOps pass over an LLM usage log: it reads a month of calls plus a pricing table and reports how much spend is recoverable - with the dollars behind every recommendation. On the synthetic demo month: 38.9% of spend recoverable, and the single biggest win (moving one classify workload to a smaller model) worth $16.28 on its own. The dollars are small because the demo log is small; the percentages and the ranking port directly to a real invoice. Every figure derives from pricing.json - auditable and reproducible, runnable as a spend gate. Public code: github.com/jigonyoo/llm-cost-optimizer

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Cover image for Messy sales CSV in, decision-ready

Messy sales CSV in, decision-ready report out: cleaning with a data-quality log, KPIs with month-over-month analysis, and an automated report with charts. Anomaly detection is baked into the report - outliers, revenue mismatches and MoM spikes are flagged where they happen, so it is not a pretty-but-blind dashboard. Every cleaning step is logged, so you can see exactly what was fixed, dropped, or flagged before any number reached a chart. Public code: github.com/jigonyoo/analytics-pipeline

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Seongnam-si, South Korea

Brand design lead building identity systems at scale.

1x: Hired

Brand design lead building identity systems at scale.

Cover image for Spoqa Han Sans (2015, 2016)

Spoqa Han Sans (2015, 2016)

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Cover image for BORNYON Seoul

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Cover image for Studio Pie (2016~)

Studio Pie (2016~)

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Wanted Brand Renewal

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Incheon, South Korea

Premium product visuals for modern skincare brands

New to Contra

Premium product visuals for modern skincare brands

ESSANA — Minimal Skincare Visuals & Brand Study

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3

Cover image for SECOND FORM — Editorial Fragrance Visuals

SECOND FORM — Editorial Fragrance Visuals

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Cover image for Calm Hydration — Minimal Skincare Visual Direction

Calm Hydration — Minimal Skincare Visual Direction

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3

Cover image for Night Repair Oil — Visual Direction

Night Repair Oil — Visual Direction

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Suwon-si, South Korea

3D Render l Model l Animation l 360VR

3D Render l Model l Animation l 360VR

Cover image for High quality 3D visualize for House

High quality 3D visualize for House

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Cover image for High quality 3d visualize for Kitchen

High quality 3d visualize for Kitchen

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Cover image for Interior design/3D visualize for IT Office

Interior design/3D visualize for IT Office

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4

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Incheon, South Korea

Founder at Heiter

New to Contra

Founder at Heiter

Cover image for ONE CARD — Prepaid Card Identity

ONE CARD — Prepaid Card Identity

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LOFT APARTMENTS — Brand Identity & Signage

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SEODAM — F&B Brand Strategy & Identity - op 2.

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SEODAM — F&B Brand Strategy & Identity - op 1.

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