Teppei Suyama

90 % Regression testing cut Replaced manual test cycles with automated C# unit tests 60 % Overtime reduced VBA automation tools lifted the load across the whole team 40 h / mo RPA savings Fully automated sales operations with Power Automate 15.45 % Search CTR Personal site SEO improvements reached ~3x the industry average (78 clicks in 25 days)

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Strengths

Drive from problem discovery to execution

I spot inefficiencies in day-to-day operations and ship fixes with VBA or Power Automate. Results include 60% less overtime and 40 person-hours/month saved with full RPA.

Full-stack skills from requirements to production

I cover the full cycle: requirements, design, backend, frontend, test automation, and operations. Certifications include Japan's Applied Information Technology Engineer, Java Gold, and LPIC.

Business outcomes through trust

I build alignment with stakeholders and turn it into business outcomes — 4× project-scale expansion at one engagement. On this self-operated portfolio I have also lifted search CTR to 15.45% (~3x industry average) through SEO improvements.

Products

Products I build on the side

Not accepting new users

YumeHashi — Turn Dreams Into Daily Action

With a dream, even the largest wall can be crossed.

YumeHashi turns dreams into daily action via three steps (write, break, keep going) plus 12-constellation gamification. Built on Flutter Web. Signups paused.

DreamsGoal ManagementGamificationFlutter

Defrago — A GTD App to Defragment Your Mind

The simplicity of taking the shortest path to the goal.

Defrago defragments your mind: capture into Inbox, classify with 4 buttons, then engage and review without hesitation. Essentialism redesign v2.0.0.

GTDTask ManagementProductivityPython

Service ended

Tasukiba — AI Operations Secretary (Service Ended)

The information you need, delivered right here, right now.

Tasukiba was an AI secretary surfacing project knowledge via semantic search. The service has ended; source code stays public on GitHub as a portfolio piece.

AI operations secretaryKnowledge Managementsemantic searchoperational efficiency

Michinari — A Study Management App Where AI Re-Plans Your Exam, Reading, and Work Goals Daily

Just follow the path it shows you.

Michinari manages certification exams, reading, and work reporting in one app. It automatically re-plans your schedule when you fall behind, has AI reflect on your daily logs, and drafts monthly reports and reading summaries. Data stays on your PC and is never sent to any server.

Study ManagementCertification ExamsReading LogSide Project