TP Coder Solutions
Thanaphoom Babparn

Specialist in High-Throughput, Secure & Cost-Optimized Systems

From architecture audits to career coaching — five interconnected services powered by one flywheel, backed by proven experience saving millions at PayPay and Coda

Services

Five services. One ecosystem. Low-ticket builds trust, high-ticket captures value.

HIGHEST LEVERAGE

Technical Consulting — Architecture & Bottleneck Audit

End-to-end analysis of a company's system architecture, CI/CD workflows, and customer-facing processes. Identifying performance bottlenecks, security risks, and cost-optimization opportunities — delivering a prioritized action plan backed by real fintech experience.

Architecture
Performance
Security
Cost Optimization
CI/CD
FASTEST TO REVENUE

Mock Interview & Career Coaching

1-on-1 senior/staff-level prep including LLD and System Design mock interviews, structured feedback, and resume/strategy reviews. Backed by 20+ real interviews conducted at PayPay — an immediate trust advantage over generic career coaches.

EXTREMELY TIMELY

Prototype / MVP Sanity Check

A "second pair of eyes" before you scale or pitch investors. Audit your DB schema, API contracts, auth flows, and architecture for idempotency, security, and scaling issues that vibe-coding tools miss. Insurance before the cost explodes.

AUTHORITY BUILDING

Paid Technical Writing

Deep-dive engineering blog posts, migration case studies, and architecture breakdowns for B2D SaaS companies. Kafka, Spring Boot, Payment flows — written by someone who has actually built them at scale, not just marketing fluff.

HIGHEST CEILING

Fractional Technical Recruiting

Companies share JDs. Using technical network and real interviewing expertise to source, technically pre-screen, and refer qualified backend engineers — earning a placement finder's fee. You actually understand the tech; standard recruiters don't.

The Customer Value Flywheel

Not 5 separate side hustles — one ecosystem. Content attracts the audience, low-ticket services build trust and capture data, high-ticket services capture the real revenue.

TOP OF FUNNEL — INBOUND ENGINE

Paid Technical Writing

Proves domain authority to CTOs and technical decision-makers (→ Technical Consulting). Relatively passive once in rhythm.

MID FUNNEL — TRUST BUILDERS

Mock Interview & Career Coaching

Zero overhead. Brilliant candidates stay in the network → refer them when consulting clients need hires (→ Recruiting fee).

Prototype / MVP Sanity Check

Founder sees the MVP auth is fine but the payment architecture is a bottleneck waiting to happen → upgrades to full Technical Consulting.

BOTTOM OF FUNNEL — HIGH TICKET

Technical Consulting

Highest leverage. Client needs to hire a team to implement the audit? "I know exactly the caliber of engineer you need." → Recruiting fee.

Fractional Technical Recruiting

Highest income ceiling. Pre-screened, technically-verified candidates — not resume spammers. Placement finder's fee per successful hire.

The B2B Loop — One Engagement, Three Revenue Streams

Complete a Technical Consulting audit. Client needs engineers to implement it. Refer a candidate from the Mock Interview network. Collect the Recruiting placement fee. The consulting engagement just paid three times.

Achievement Highlights

The track record that makes this specialist positioning credible — not theory, real systems at scale.

Mission-Critical System Optimization

Enterprise

Re-engineered a personalized asset delivery system, replacing a legacy multi-tenant solution with a streamlined Spring Boot 3.2 (Kotlin) application using coroutines and asynchronous caching. Achieved 8,000 RPS with minimal latency, exceeding peak demand of 7,000 RPS.

Kotlin
Spring Boot
Performance

Large-Scale System Migration

Data Processing

Led the migration of 36 Spark-Scala ETL jobs and 51 data lake tables to a new architecture, achieving a cost reduction of 548,000 yen daily (200 million yen annually) while maintaining data integrity and system performance.

Scala
Spark
ETL

High-Volume Notification System

FinTech

Spearheaded the architecture and development of high-throughput, low-latency push notification services handling 120+ million daily notifications for diverse use cases, including transactional and promotional campaigns.

Java
Microservices
Scalability

Cross-Functional Workflow Automation

Marketing Tech

Designed and implemented a timeline notification delivery system from scratch, including drafting, requirements analysis, and implementation with Kotlin, Spring WebFlux, Cadence Workflow, and Kafka integration. Reduced 100 hours per month for the marketing team and increased annual GMV by 4M JPY.

Kotlin
WebFlux
Kafka

My Approach

01

Analyze

Thorough understanding of business requirements and technical constraints before proposing solutions.

02

Design

Creating robust, scalable architectures with a focus on correctness, performance, and maintainability.

03

Implement

Clean, efficient code using modern best practices and appropriate technologies for each problem.

04

Deliver

Timely execution with clear documentation and knowledge transfer to ensure long-term success.

Technical Expertise

Languages

Java 21+
Kotlin
Rust
Go
TypeScript

Frameworks

Spring Boot
Spring WebFlux
Quarkus
Micronaut
Actix
Axum
Spark

Technologies

Kubernetes
Docker
RDBMS
MongoDB
Redis
Kafka
RabbitMQ
Cloud Native

Working Model

Project-Based Engagement

I work on a project basis rather than hourly, dedicating 4-5 hours daily outside regular working hours to ensure focused and effective delivery.

Availability Hours

Weekdays

8:00 PM - 12:00 AM (ICT/JST)

Weekends

8:00 AM - 10:00 PM (ICT/JST)

* Time zone is ICT or JST, depending on my current location.

Project Approach
  • Clear project scope and deliverables defined upfront
  • Transparent timeline and milestone-based delivery
  • Regular updates and communication throughout the project
  • Knowledge transfer and documentation included in every project

Get In Touch

Ready to start a consulting engagement, book a mock interview, or discuss a technical writing project?

Send an email describing your situation or what you need:

tp.babparn@gmail.com

I'll get back to you within 1-2 business days.