About us

SundayLager

We solve real operational problems with AI. For three years we have run a service that organizes sellers' sales data automatically every day, proven with more than 50 sellers.

What we learn by building, we bring into training. Building and teaching are not separate jobs for us. That is how we work.

Leadership

Yang Bonghyun Director

A specialist in generative AI agent development and workflow automation, personally leading both development and training focused on real-world adoption: from AI literacy courses for corporate employees to hands-on agent design and building with Claude Code.

Career

Current: CEO of an AI and automation training and development agency
Former: Server developer at H (IT startup)
Former: Server developer at L (IT startup)
Former: Server developer at B (IT startup)
Former: Global technical support and sales at H (major office software company)

Core expertise

AI agent design and development with Claude Code
LLM and RAG-based AI service development
AI training for non-developer corporate employees
Project coaching based on real business tasks
Workflow and web automation

Selected training

S (major IT services company): AX training for developers, lead instructor (2026)
L (major household and beauty company): AX competency certification for newly promoted staff, tutoring (2026)
K (bank): AI training for new hires, lead instructor (2026)
S (major conglomerate affiliate): online AI project mentoring for employees (2026)
P (hotel and resort group): AI PBL course for employees, lead instructor (2026)
N (major tire manufacturer): cross-functional AI job training, tutoring (2026)
C (city gas supplier): AI PBL course for employees, tutoring (2026)
N (major food company): AI product adoption training for overseas sales teams, lead instructor (2026)
S (major retail company): Gemini agent-building PBL course for employees, lead instructor (2026)
H (major heavy industry company): Copilot agent training for newly promoted staff, lead instructor (2026)
D (major heavy industry company): AI literacy training for employees, lead instructor (2026)
Team Sparta: KDT AI web developer program, backend/AI tutor (2021 to 2025)

Key projects

Improving AI-based document recognition and analysis models
NLP-based automatic data classification and matching system
AI model development and data processing pipelines
Technical support and solution operations for overseas clients

Our principles

They apply equally to development and training.

Start from the field

We don't offer solutions before understanding the problem.

Validate small, then expand

We move to the next step only after the effect is confirmed.

Own it to the end

We don't stop at delivery; we see it through operation and adoption.

Visit us

1420, DMC Starbiz 6st, 36 Kkotmaeul-ro, Deogyang-gu, Goyang-si, Gyeonggi-do, Republic of Korea

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