# Senior Backend Engineer - Go, Node.js/TypeScript, PHP/Laravel Location[South Korea](https://jobicy.com/resume-region/south-korea.md)Rate, USD $60 / hourWork schedule Contract, Part Time, Links Language skills English, KoreanAvailable for Hire Yes Hire me Save Log in to save * ## About me Backend engineer with 9 years of experience spanning full-stack web services (PHP/Laravel, Node.js/TypeScript, React/Next.js) and high-throughput real-time systems in Go – most recently a production order management system running 100+ concurrent trading strategies. Comfortable owning a service end to end, from API and data model to frontend. I use AI-assisted development (Claude Code) as a day-to-day pair-programming tool across the whole dev loop – planning, writing and reviewing code, and triaging failures from logs – while still treating AI output as untrusted input that gets reviewed before anything ships. Comfortable with milestone-based delivery and async communication across time zones. ## Professional area ### [Developer & Engineer](https://jobicy.com/resume-category/dev.md) ## Skills ### [AI - Artificial intelligence](https://jobicy.com/resume-skill/ai.md)[API](https://jobicy.com/resume-skill/api.md)[Automation](https://jobicy.com/resume-skill/automation.md)[CI/CD](https://jobicy.com/resume-skill/ci-cd.md)[CSS3](https://jobicy.com/resume-skill/css3.md)[DevOps](https://jobicy.com/resume-skill/devops.md)[Docker](https://jobicy.com/resume-skill/docker.md)[Full Stack Development](https://jobicy.com/resume-skill/full-stack-development.md)[Git](https://jobicy.com/resume-skill/git.md)[GitHub](https://jobicy.com/resume-skill/github.md)[Golang](https://jobicy.com/resume-skill/golang.md)[HTML5](https://jobicy.com/resume-skill/html5.md)[JavaScript](https://jobicy.com/resume-skill/javascript.md)[Laravel](https://jobicy.com/resume-skill/laravel.md)[Linux](https://jobicy.com/resume-skill/linux.md)[Machine Learning](https://jobicy.com/resume-skill/machine-learning.md)[MySQL](https://jobicy.com/resume-skill/mysql.md)[Node.js](https://jobicy.com/resume-skill/node-js.md)[PHP](https://jobicy.com/resume-skill/php.md)[Project Management](https://jobicy.com/resume-skill/project-management.md)[Python](https://jobicy.com/resume-skill/python.md)[React](https://jobicy.com/resume-skill/react.md)[Redis](https://jobicy.com/resume-skill/redis.md)[Rest API](https://jobicy.com/resume-skill/rest-api.md)[Team Leadership](https://jobicy.com/resume-skill/team-leadership.md)[TypeScript](https://jobicy.com/resume-skill/typescript.md) ## Education Feb 2013 - Jun 2016 Associate Degree, Computer & Electronic Engineering @ Myongji College Feb 2010 - Feb 2013 Electronics @ Yongsan Technical High School ## Experience Aug 2025 - May 2026 Senior Engineer, Quantitative Engineer @ OneBullEx – Owned both the backend and the React/TypeScript ops dashboard for a multi-strategy algorithmic trading system; applied an AI-native (Claude Code) development methodology to build and operate a complex trading system as a single engineer. – Built a real-time operations dashboard (Go/fasthttp backend, React/TypeScript frontend) showing live uPnL, positions, and order history via a WebSocket hub, plus a 1-minute snapshot worker reconciling exchange REST data into a NAV/PnL pipeline; infra metrics via VictoriaMetrics + Grafana (15+ custom metrics). – Developed a multi-strategy OMS execution engine in Go handling 100+ concurrent trading signals – queueing/throttling/retry against exchange rate limits, FSM-based execution from signal to fill, and safeguards against duplicate/rapid-fire signals; achieved P99 200ms order processing even against exchanges without WebSocket support. – Designed an AI-native development workflow for long-running complex systems: layered context documents, Claude Code hooks enforcing project rules, an AI code-review loop, and MCP/Skills-based code search to keep AI output consistent with agreed specs. May 2024 - Jul 2025 IT Director @ JJHOLDINGS Inc. – Sole owner of infrastructure and internal systems (4-5 systems: CRM, web, app, internal tools) used by roughly 30-50 people across 4 departments. – Led parallel new-CRM development and legacy-CRM maintenance – prioritized via stakeholder interviews and ran the full cycle from planning through deployment and support. – Full-stack development of new internal web services end to end (requirements, UI/UX, frontend/backend, deployment, operations). – Owned company-wide infrastructure and data governance – servers, network, accounts, security, backups; unified previously siloed departmental data. – Managed and maintained the company’s mobile app. Jul 2023 - Apr 2024 CEO / Freelance Developer @ SEA (Baada) – Independently won, developed, and delivered freelance projects (Laravel/React) across 4 new builds and 2 maintenance contracts over about 10 months, owning the full lifecycle – client meetings, quoting, scheduling, development, QA, deployment, and operations – across multiple concurrent clients. – Completed a 2-month short-term frontend placement at an SI firm, ramping up quickly on an existing codebase, domain, and team culture to deliver results immediately. Jul 2022 - Jul 2023 Backend Team Lead (Playing Lead) @ Coworkernet – Joined as dev-team lead transitioning the org from SI-agency work to an in-house team, and reorganized how the team worked – process, tech stack, and hiring. – Led the migration from legacy HTML/jQuery to React, defining component architecture, state-management patterns, and build-environment standards; onboarded the team onto React as the new default stack. – Owned junior-developer hiring, onboarding, and incubation – from interviews to real project deployment, via code review and pair programming. – Introduced Slack/Notion and defined collaboration processes – channel structure, notification rules, doc templates, and workspace structure for async communication. – Backend development of B2B/B2C SaaS APIs (Laravel) – RESTful APIs, DB schema, auth/permissions, and external integrations. Jul 2020 - Jun 2022 Project Manager @ Fifteen H – Dev-background PM overseeing multiple web/app projects as the communication hub between planning, design, and development. – Managed cross-department communication and project delivery – requirements gathering, scheduling, issue tracking, and translating between technical constraints and business requirements (including with the design team). – Managed iOS app releases and native integrations – APNs push, StoreKit auto-renewing subscriptions (IAP) with receipt validation and restore, and App Store review compliance, while keeping the existing payment structure intact through review. Jun 2017 - Jun 2020 Application Software Developer @ Sunwoon E&G – Sole designer/developer of AutoCAD workflow-automation programs and libraries at a surveying/engineering firm. – Built and patented a 3D-LiDAR-based transmission-line sag-detection library – isolating candidate wires from large-scale 3D point clouds and auto-computing sag curves via curve fitting; adopted into the company’s standard workflow and recognized for technical originality (registered patent). – Developed a unified AutoLISP library-management program (platform-level design). ## Recommend this talent ## Related resumes [![Photo](https://jobicy.com/react/themes/app/images/candidate.png) AI LeadKuwaitI am a senior AI/ML technical leader with 9+ years of experience delivering AI, LLM, RAG, agentic AI, MLOps, and data-driven solutions across telecom, banking, manufacturing, HR, healthcare, and enterprise…](https://jobicy.com/cv/id148962.md) * [![Photo](https://jobicy.com/react/themes/app/images/candidate.png) Staff Product DesignerSerbiaI am a Head of Design with 10+ years of experience building enterprise B2B SaaS platforms, marketplaces, and AI-assisted products. I have led cross-functional teams and helped shape product strategy…](https://jobicy.com/cv/id148960.md) * [![Photo](https://jobicy.com/react/themes/app/images/candidate.png) Operations Analyst / Data & Reporting AutomationKyrgyzstanI am a technical specialist with hands-on experience in Python, SQL/SQLite, Firebase, and web technologies. My focus is on structured data, reporting logic, validation, and practical automation of repetitive workflows….](https://jobicy.com/cv/id148959.md) * [![Photo](https://jobicy.com/react/themes/app/images/candidate.png) AI Engineer and Full Stack Software EngineerUnited StatesI am an AI Engineer and Full Stack Software Engineer with more than 3 years of experience building production-scale Generative AI applications, conversational AI systems, distributed backend platforms, and cloud-native…](https://jobicy.com/cv/id148955.md) * [![Photo](https://jobicy.com/react/themes/app/images/candidate.png) Customer Success SpecialistUnited StatesI am a customer success, training, and application-support professional with a Bachelor of Applied Science in Applied Computing and firsthand higher-education learner experience using D2L/Brightspace through University of Arizona coursework….](https://jobicy.com/cv/id148954.md) [More Resumes](https://jobicy.com/talent.md)