Jeongtae Kim / 김정태
Resume
KO

Jeongtae Kim

A full-stack developer who designs and builds business systems for large companies.

Approval workflows, access control and system integration, on client projects for large Korean companies.

Role
Development Team Lead · Mendix · Software Developer
Based in
Gwacheon, South KoreaOnsite, hybrid, and remote

Open to the right opportunity.

See the projects

Results in numbers

Each figure with the work it came from.

10 enterprise clients
The same list as the marks below. Roles per project in the enterprise case.
About 7 weeks
Requirements to release, single-handed.
Minutes → about 10 seconds
Bulk export speed. Work postponed because of the wait can now be done immediately.
28 UI screens · 28 MCP tools
Sized for real work, not a demonstration.
6h → 3.3h (45% faster)
Document work. One person’s method turned into a team template standard.

Clients

Companies whose projects I worked on under contract. Roles and work per project are in the enterprise case, where clients are identified by letter.

Each mark is its owner’s trademark, shown to identify projects worked on. No endorsement or affiliation implied.

Enterprise projects and AI adoption

Enterprise systems are the main area; recently, connecting AI to them.

Enterprise projects

Approval workflow design, role-based permissions, budget access control, heavy processing, external integration.

Scope
Architecture sized for thousands of users

See the enterprise projects

AI and DX

Multi-agent chatbot and MCP server on Mendix business systems. Internal data queried and acted on in natural language.

Scope
Scoped to Agent and MCP work inside Mendix plus integrations I can attribute to myself

Read the AI and DX case

Product case

Campaign Operations & Client Collaboration Platform

Scattered agency work brought into a single workflow per campaign. Internal and advertiser screens stay separate but read the same data.

  1. Campaign summary

    Campaign, quote, review and placement status on one screen. Blocked steps visible at a glance.

    A campaign summary screen linking quote, review, and placement status
    Campaign summary screen, showing stage status and what is waiting.

  2. Quote and approval

    Quote lines beside approval status. Everything an approval needs, in one place.

    An operations screen showing quote line items beside their approval state
    Quote screen, with the line items and the approval status together.

  3. Content review

    Timestamped comments on video, drawing markup on images. Feedback lands on the work itself.

    A content review screen with timestamped comments and drawing markup
    Content review screen, with timestamped video comments and image markup.

  4. Client review and sharing

    Separate internal and advertiser links, with different fields visible on each.

    A client-facing review screen with internal information withheld
    Advertiser share screen — the review view with internal fields removed.

  5. Placement report

    Per-platform status and scheduled collection points as cards. Reviewed with the advertiser after publication.

    Placement report cards showing per-platform status and collection points
    Placement report screen, with per-platform status and scheduled collection cards.

Read the full campaign case

How I work

How a requirement moves through to delivery.

  1. Understand the work

    Start from how the job is actually done, not from a feature list.

  2. Agree the scope

    What the system will and will not handle, written down and agreed before build.

  3. Automate the repetition

    Repeated judgments written up as rules and moved into code or templates.

  4. Verify and hand over

    Measured before and after, documented for whoever picks it up next.

Working with AI tools

  • Claude Code, Codex, Gemini and local LLMs, used daily for design review, implementation and documentation
  • Architecture decisions, scope and final review stay with me
  • Tool-generated code ships only after review

Standardised effort estimation

Estimates that varied by author reworked into a difficulty-and-grade standard, now the team baseline.

Generated test data

Generator added so spreadsheet-upload testing no longer needs hand-built data.

Moved weekly reporting into a template system and cut writing time by about half
Less writing time, one shared format.
Reduced document work from six hours to 3.3 hours, a 45% cut
The repeated sections of each deliverable replaced by templates.
Standardised documents were reused five times as often
Written once, reused across the team.
Shortened onboarding for new teammates by 30%
New joiners spend less time hunting for material.

Career

  1. 2022.07–Present

    Mendix · Software Developer

    Codeflow (formerly IOISOFT)

    Business systems and integrations for large corporate clients.

  2. 2025.01–Present

    Development Team Lead · Mendix · Software Developer

    Set team development standards and the estimation baseline; own project schedule and quality.

Credentials and education

  • Mendix Advanced Certification, earned 2025.03
  • Mendix Intermediate Certification
  • Engineer Information Processing (Korean national technical qualification), earned 2025.09
  • Computerized Tax Accounting, Level 2 (Korean professional qualification)
  • Bachelor of Engineering in Computer Science, National Institute for Lifelong Education (Korea), earned 2026.02
  • Inha University, double major in Economics and Political Science and International Relations, 2013.03–2021.02

Contact

Email is fastest. Hiring and project enquiries both welcome.

Open to the right opportunity.

wjdxo9928@gmail.com