SENIOR WEB2 · WEB3 · AI

Hi,I'm Boul Lee

Independent engineer and technical lead with 15+ years of experience building Web2 platforms, Solana DeFi/NFT protocols, and AI-powered services.

Korean · Based in Seoul · Korean (native), English (professional)

Contact meView what I do
Years in production
15+
Teams led
3–30 engineers
Stacks
Web2 · Web3 · AI

What I build

Web & Platform Engineering

Enterprise web, admin consoles, and high-traffic services using PHP, ASP.NET, Node.js, and modern React/Next.js frontends.

Web2

Product & Team Leadership

Hands-on lead and former CTO, comfortable from solo builds to mentoring and coordinating 30+ engineers.

Lead / CTO

Web3, Solana & AI

Solana DeFi/NFT programs, Cosmos SDK chains, and AI services (LLM/RAG) integrated into real products.

Web3 · AI

From CMS and ecommerce to Solana DeFi, NFT marketplaces, and AI tools, I focus on shipping production systems that are fast to iterate on yet stable in real-world traffic.

SERVICES

From idea to running system, owned end‑to‑end.

Web, app, and blockchain – responsible for the full cycle from start to finish, with a focus on measurable business impact.

Web platforms & SaaS

Design and implementation of secure, scalable web applications with modern JavaScript and .NET ecosystems.

  • Architecture and green‑field builds for B2B/B2C web apps
  • React and Next.js frontends with App Router and Server Components
  • Node.js, ASP.NET MVC, and PHP (Laravel / Symfony) backends
  • Relational (PostgreSQL, MySQL) and NoSQL data modeling
  • API design (REST / GraphQL) and third‑party integrations

Ideal for admin consoles, SaaS dashboards, customer portals, booking and payment systems.

Mobile & cross‑platform apps

Native‑quality experiences for Android and iOS with robust CI/CD and store‑ready delivery.

  • Native Android (Kotlin) and iOS (Swift) app development
  • React Native and Flutter for shared codebases
  • Secure authentication, payments, and push notifications
  • Offline‑first, background sync, and device integration
  • Play Store / App Store submission and release automation

Perfect for consumer apps, on‑the‑ground operations tools, and executive dashboards.

Blockchain, DeFi & digital assets

Specialized engineering for Cosmos‑based chains and Solana DeFi protocols with production‑grade security practices.

  • Cosmos SDK‑based chain design, modules, and tooling
  • Solana DeFi protocols: AMMs, lending, and staking
  • NFT minting pipelines, marketplaces, and launchpads
  • Wallet integrations and custody / key‑management flows
  • On‑chain / off‑chain data indexing and dashboards

Critical protocol reviews are handled with specialized auditors, with support through testnet and mainnet launches.

TECHNOLOGY

Opinionated, modern stack – selected for reliability.

Balancing cutting-edge capabilities with battle-tested technologies to keep your system maintainable and secure.

Web & APIs

Modern frontends and robust backend services.

Product & platform
Frontend
React, Next.js (App Router), TypeScript, Tailwind CSS, Radix UI, Angular, Vue
Backend
Node.js (Express / NestJS), ASP.NET Core & MVC, PHP (Laravel / Symfony, GNUBoard), Java, C/C++
Databases
PostgreSQL, MySQL, MariaDB, MongoDB, Redis, ElasticSearch

BeginnerJuniorSenior

15+ years · senior / lead level

Designing clean modular architectures that support feature growth without rewrites.

Mobile

Native and cross‑platform experiences.

Mobile UX
Native
Kotlin, Jetpack Compose, Swift, SwiftUI
Cross‑platform
React Native, Flutter
Tooling
Fastlane, Firebase, Sentry, mobile CI/CD pipelines
Game & low‑level
C/C++, Direct3D, Win32, Assembly / ANSI C, reverse engineering

BeginnerJuniorSenior

6+ years · senior / lead level

Optimized for performance, battery usage, and real-world network conditions.

Blockchain

Protocol‑level and application‑level engineering.

DeFi & infra
Cosmos
Cosmos SDK, Tendermint / CometBFT, IBC, custom modules
Solana
Rust, Anchor Framework, SPL tokens, on‑chain programs
Web3
ethers.js, web3.js, wallet adapters, indexers

BeginnerJuniorSenior

6 years · senior / lead level

Close collaboration with you and your stakeholders to design tokenomics, governance, and operational processes.

Cloud & DevOps

Secure, observable, and automated infrastructure.

SRE
Cloud
AWS, GCP, Azure, containerized workloads
Orchestration
Docker, Kubernetes, Helm, managed PaaS
Ops
GitHub Actions, GitLab CI, Prometheus, Grafana, ELK stacks

BeginnerJuniorSenior

15+ years · senior / lead level

Monitoring, alerting, and security baked in from day one to support 24/7 operations.

AI & Data

From API‑first integration (ChatGPT, Gemini, Claude) through RAG and fine‑tuning to custom training – I work across the full stack so you ship at the right level for your product and budget.

AI Engineering
API & orchestration
OpenAI, Anthropic, Gemini, Claude APIs · prompt design and agents (LangChain, LangGraph) · when to use paid APIs vs open weights (Llama, Mistral) · production rollout and cost control
Models & adaptation
Paid APIs vs open‑weight models · fine‑tuning (API or LoRA/QLoRA) · embeddings and vector stores · RAG pipelines, chunking, retrieval evals · self‑hosted vs inference APIs (Together, Groq)
Data & MLOps
PostgreSQL, Redis, vector DBs · embedding and indexing pipelines · prompt and model evaluation · tracing, observability · training pipelines and infra when custom models are needed

BeginnerJuniorSenior

2 years · senior / lead level

I help choose and build the right stack: API‑only, RAG on your data, or custom training – so you ship measurable impact to production, not research demos.

PROCESS

Transparent delivery from discovery to operations.

A senior engineer leads every stage and keeps scope, timeline, and risk clearly visible.

  1. 01

    Discovery & scoping

    Understand your business goals, constraints, and existing systems. Produce a high‑level solution outline and effort estimate.

  2. 02

    Architecture & planning

    Design system architecture, data flows, and release strategy. Prioritize scope into milestones with clear deliverables.

  3. 03

    Implementation & QA

    Iterative development with code reviews, automated tests, and regular demos. Security and performance considered from the start.

  4. 04

    Launch & operate

    Roll-out, monitoring, and on-call support. I can operate the platform for you or hand it over with training and documentation.

CONTACT

Let’s build or explore together.

Whether it’s a new product, an audit of an existing codebase, or an idea around Solana, Cosmos, or AI – feel free to reach out.

I value honest conversations, realistic timelines, and long‑term collaboration more than short‑term hype.

Share a few lines about what you have in mind and I will reply personally with next steps.

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