# Senior Backend Engineer - Go, Node.js/TypeScript, PHP/Laravel Location Not setDesired Salary 60 - USD/hourlyWork preference Contract, Part TimeLinks Joined7 Jul 2026Field / Industry Software Engineering * SharePreferences:Status: Actively lookingRelocation: NoNotice Period: ImmediateSkill Assessments:This user has not passed any tests yet Languages: English - Korean - Report [Overview](#overview) ## 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. ## Skills ### [Project Management](https://jobicy.com/talent/project-management.md)[Python](https://jobicy.com/talent/python.md)[JavaScript](https://jobicy.com/talent/javascript.md)[React](https://jobicy.com/talent/react.md)[Docker](https://jobicy.com/talent/docker.md)[Linux](https://jobicy.com/talent/linux.md)[CI CD](https://jobicy.com/talent/ci-cd.md)[TypeScript](https://jobicy.com/talent/typescript.md)[Machine Learning](https://jobicy.com/talent/machine-learning.md)[Git](https://jobicy.com/talent/git.md)[Team Leadership](https://jobicy.com/talent/team-leadership.md)[Automation](https://jobicy.com/talent/automation.md)[GitHub](https://jobicy.com/talent/github.md)[DevOps](https://jobicy.com/talent/devops.md)[MySQL](https://jobicy.com/talent/mysql.md)[PHP](https://jobicy.com/talent/php.md)[Redis](https://jobicy.com/talent/redis.md)[Golang](https://jobicy.com/talent/golang.md)[HTML5](https://jobicy.com/talent/html5.md)[CSS3](https://jobicy.com/talent/css3.md)[Laravel](https://jobicy.com/talent/laravel.md) ## Education Myongji College Feb 2013 - Jun 2016 Associate Degree, Computer & Electronic Engineering Yongsan Technical High School Feb 2010 - Feb 2013 Electronics ## Experience Senior Engineer, Quantitative Engineer @ OneBullEx Aug 2025 - May 2026 - 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. IT Director @ JJHOLDINGS Inc. May 2024 - Jul 2025 - 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. CEO / Freelance Developer @ SEA (Baada) Jul 2023 - Apr 2024 - 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. Backend Team Lead (Playing Lead) @ Coworkernet Jul 2022 - Jul 2023 - 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. Project Manager @ Fifteen H Jul 2020 - Jun 2022 - 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. Application Software Developer @ Sunwoon E&G Jun 2017 - Jun 2020 - 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).