Business Systems Engineer
Former HubSpot Engineer & Technical Consultant

Hi, I’m Chuck Choi.

I turn business problems into working software.

I combine customer-facing consulting and software engineering experience to build applications, integrations, and automation that improve how teams work.

hyunchoi94@gmail.com949-233-0175
Tustin, CA
Chuck Choi
Email MeLinkedIn

Professional Work

Selected SaaS, cloud, AI, and data solutions from my work at Pulmuone and HubSpot, grounded in measurable customer and business outcomes.

Internal production systemAzure-hosted

MD Market Research & Reporting

Problem
Reduce the time spent on market research and weekly reporting, and make the related operations easier to manage.
Users
Employees completing mobile workflows and administrators managing markets, stores, users, and reporting.
Solution
A production system deployed on Azure, with a mobile experience for employee tasks and a web portal for administration and reporting.
My role
Developed and deployed the mobile and web applications, using Codex-assisted development to turn business requirements into a working system.

Workflow outcome

67%

Less time to complete tasks

Employees completed the workflow in about one-third of its previous duration.

Designed around each user’s work

Employee mobile workflows

A focused path for completing market research tasks.

Admin web portal

A central workspace to manage markets, stores, users, and reports.

cloud workflow system

Pulmuone NPD Workflow Transformation

Designed and implemented a cloud-based new product development workflow, replacing email- and Word-based processes across cross-functional teams.

  • Cross-functional discovery and solution design
  • Centralized workflow and structured business data

Planning timelines: 4 weeks → 1.5 weeks

azure ai

AI-Powered Document Translation

Built a document translation platform using Azure Translator APIs while preserving the formatting of the original business documents.

  • Cut translation time from 1 hour to under 10 minutes
  • API integration with formatting preservation

Over 80% less translation time

automation & reporting

Business Systems Automation & Reporting

Automated recurring BI reports to replace manual processes and provide teams with real-time operational insights.

  • Power BI dashboards and data modeling
  • SQL-backed reporting workflows
  • Power Automate process automation

10+ recurring BI reports automated

enterprise saas

HubSpot Workflow Automation

Developed customer-facing Undo/Redo and hierarchical folder management features for HubSpot’s workflow automation platform.

  • Reliable state recovery for complex workflows
  • Hierarchical folders for organizing workflows

20% fewer runtime errors after TypeScript migration

Projects

Public demos exploring document search, access controls, and offline workflows, built around practical user needs and technical tradeoffs.

Multi-tenant SaaS AI knowledge base

Beacon

Public demo

Beacon helps teams upload company documents, manage workspace access, and ask natural-language questions that return grounded answers with citations from only the documents each user is authorized to access.

Beacon demo screenshot
  • Tenant, role, and department-aware authorization
  • Private document upload, parsing, chunking, and search
  • AI answers with citations from authorized context only
  • Supabase Postgres, Storage, RLS, and pgvector
Next.jsReactTypeScriptSupabaseOpenAI

Design focus

Access rules shape which documents can supply an answer, while citations let users inspect the source material behind it.

Open Demo
Offline-first ordering workflow

CourtCraft Orders

Public demo

CourtCraft Orders gives tennis goods reps a tablet-friendly workflow for refreshing demo master data, creating location-specific orders, capturing buyer signatures, saving completed orders locally, and syncing queued orders when connectivity returns.

CourtCraft Orders demo screenshot
  • Customer, store, item, and location assignment refresh flow
  • Location-aware catalog filtering, cart review, and checkout
  • Buyer signature capture with saved checkout history previews
  • Offline local storage with queued sync retry when online
ExpoReact NativeTypeScriptZustandSQLite

Design focus

Order entry and checkout history stay available locally. A queued sync flow lets reps keep working when connectivity is unreliable.

Open Demo

About me

At HubSpot, I progressed from technical support to customer-facing consulting and then software engineering. Today, I build business applications at Pulmuone, taking requirements through development and deployment.

I’m especially interested in customer-facing engineering work that connects technical discovery and solution design with hands-on implementation. I value collaborative teams where customer needs, product decisions, and engineering stay closely connected.

Experience

Pulmuone Foods USA, Inc.
Business Systems Engineer
Build internal applications, API integrations, and automation for compliance, marketing, and operations. Delivered an Azure-hosted mobile app and web admin portal for market research and reporting that reduced task completion time by 67%, alongside document translation and NPD workflow systems.
02/2024 - Present
HubSpot
Software Engineer — Automation Team
Built customer-facing Undo/Redo and folder management features for HubSpot’s workflow automation platform. Helped lead a JavaScript-to-TypeScript migration that reduced production runtime errors by 20%.
10/2021 - 02/2023
HubSpot
Technical Consultant — Professional Services
Led 20+ complex HubSpot CMS migrations and completed 70+ technical qualification reviews while maintaining 85%+ customer satisfaction.
10/2020 - 10/2021
HubSpot
Technical Support Specialist
Resolved 8,000+ complex customer issues across HTTP(S), DNS, SSL, REST APIs, and authentication. Trained 45+ support engineers across four cohorts.
08/2018 - 10/2020

Skills

Solutions & Implementation

  • Technical Discovery
  • Proof of Concept (POC)
  • Solution Design
  • Technical Implementations
  • Customer Enablement

Data, Cloud & AI

  • REST APIs
  • OpenAI API
  • Azure AI Services
  • Azure
  • SQL
  • Python
  • Power BI
  • Power Automate
  • AI-Assisted Development (Codex, Claude)

Web & Infrastructure

  • HTTP(S)
  • DNS
  • SSL/TLS
  • Authentication
  • Enterprise SaaS
  • React
  • TypeScript
  • JavaScript

Education

General Assembly
Software Engineering Immersive
2020
Cal Poly Pomona University
B.S. in Hospitality Management
2016