David L.
Senior Full Stack Engineer
Experience
Apr 2024 - Nov 2025
1 year 8 monthsSenior Full Stack Engineer
Lifinity
- Architected and deployed on-chain smart contracts for DEX of LSTs and YBTs, including Merkle-tree based distributions and oracle integrations.
- Implemented end-to-end workflow for mint, redeem, withdraw, deposit, and swap actions interfacing with on-chain programs; ensured atomicity guarantees, error handling, and idempotency.
- Built 3rd-party marketing action pipelines through API integrations with Marinade, Sol Blaze, Kamino Lending, Solend, MarginFi, Jupiter, Flash, Kyros, etc.; implemented robust retries, circuit breakers, and observability.
- Implemented Web3 data indexing and caching layers to accelerate page loads and reduce RPC calls; introduced indexers, event listeners, and stream processors.
- Successfully passed security audit for Lifinity smart contracts, integrating remediation notes and ensuring audit-ready code.
Apr 2023 - Nov 2023
8 monthsSenior Full Stack Engineer
Motley Labs
- Designed and implemented a data layer to expose NFT trading analytics and a user points system; optimized for read-heavy workloads and real-time dashboards.
- Built a NFT marketplace module handling listing, delisting, bids, and sales with immutable audit trails and event-driven state synchronization.
- Implemented advanced page-loading optimizations using Next.js techniques (image optimization, dynamic imports, static/dynamic rendering strategies) and robust API integrations to reduce hydration time and improve TTFB.
- Contributed to open-source TypeScript SDK package development; established coding standards, tests, and CI/CD workflows.
Nov 2022 - Apr 2023
6 monthsSenior Full Stack Engineer
Yaku Corp
- Generated a multisig SDK from Squads protocol and integrated it into the YAKU web application; ensured secure key management and access control semantics.
- Implemented custodial and non-custodial staking smart contracts with seamless off-chain/on-chain integration and secure custody patterns.
- Developed NFT crafting smart contract (mint, stake, burn, metadata updates) with provenance and on-chain metadata management.
May 2022 - Oct 2022
6 monthsFull Stack Engineer
UGS
- Integrated Cardinal staking to deliver a scalable staking web application; implemented staking logic, rewards accrual, and user portfolio views.
- Delivered an NFT actions indexer leveraging Helius API and webhook infrastructure to synchronize on-chain events with the application.
- Built a raffle program with multi-winner logic and ensured seamless front-end integration and secure claiming processes.
Jan 2019 - Apr 2022
3 years 4 monthsHybrid
Full Stack Engineer
G Inc
- Delivered a comprehensive Glass dating service (monolithic web API server with a hybrid mobile app) deployed to production.
- Maintained and evolved the Glass dating service by implementing essential customer-service features (feedback channels, user support flows, and in-app help) and addressing scalability challenges through performance optimizations, load testing, and architectural improvements to support growing user demand.
- Implemented Veritrans4G payment gateway integration with secure transaction flows and PCI-compliant handling.
- Led the admin/operations dashboard development for service management, analytics, and workflow automation.
Jan 2017 - Dec 2018
2 yearsFreelancer
Lancers
- Built a collaborative web platform for artists with modular, scalable architecture and reusable UI components.
- Implemented travel booking features using BookingCore, along with Google Maps integration for geospatial search and routing.
- Created an e-commerce site with scraping utilities for product data aggregation; developed a mobile companion app for commute-time insights.
Summary
Seasoned software engineer with 9+ years of end-to-end web development experience, spanning frontend, backend, and DevOps, plus 4+ years specializing in Solana blockchain development. Proficient in design, implementation, and optimization of scalable systems, smart contracts, data indexing, and secure API integrations. Demonstrated ability to architect robust data pipelines, implement Web3 tooling, and contribute to open-source ecosystems. Strong collaborator across GTM and engineering teams, with a track record of delivering performant, production-grade solutions.
- Core competencies: Full-stack development, blockchain (Solana), smart contracts (Rust/Anchor), on-chain/off-chain data indexing, , CI/CD, cloud (AWS/GCP), databases (MySQL, PostgreSQL, MongoDB), data modeling, secure DevOps, performance optimization, and open-source contributions.
- Technical breadth: Rust/Anchor, TypeScript, React/Next.js, Node.js, Golang, Python/Django, Angular, CI/CD pipelines, serverless (AWS Lambda), cloud infrastructure, and monitoring.
Languages
English
AdvancedJapanese
AdvancedEducation
Sep 2012 - Aug 2016
Fukuoka University
Bachelor's degree · Computer Sicence · Fukuoka, Japan
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