YASINDU NETHMINA
Full-Stack
Product Engineer
Product teams hire me when they need a full-stack engineer who can take ownership and ship fast.
A FEW WORDS ABOUT ME
Full-Stack Engineer with 5+ years building high-performance products across SaaS, finance, data-heavy systems, AI-enabled workflows, and modern web platforms.
With over 5 years of hands-on experience, I architect and deliver robust full-stack solutions across both frontend and backend for high-growth startups and product teams. Most recently at v21 Studio, a top-tier UK-based design agency, I led end-to-end engineering across 25+ client projects. Before that, at ProtoKOLs, I led architecture for an AI-powered analytics platform that transformed complex datasets across 100K+ influencers into actionable insights for brands and agencies.
WHAT I WORK ACROSS
Best suited to end-to-end product work where architecture, implementation, and user experience need to stay aligned.
Full-Stack Engineering
End-to-end product ownership across frontend, backend, and delivery.
Frontend Architecture
SSR, RSC, performance, and scalable UI systems for modern web apps.
Backend Systems
API design, service architecture, authentication, and third-party integrations.
Database Architecture
Schema design, query optimization, data modeling, and scalable persistence layers.
CORE STACK
The core technologies, architecture patterns, and systems I rely on to build reliable, scalable web products.
Frontend
TypeScriptJavaScriptReactNext.jsModule FederationTailwind CSSshadcn/uiTanStack QueryZustandThree.js
Backend & APIs
Node.jsExpress.jsNestJSHonoRESTGraphQLtRPC
Data Layer
SQLPostgreSQLMongoDBRedisPrismaDrizzle ORM
Realtime & Systems
WebSocketsSSEEvent-Driven SystemsQueuesSchedulersCaching
Infrastructure & Delivery
DockerAWSVercelSupabaseRailwayGitHub ActionsSentry
Web3 & AI
SolidityWagmiViemAI Agents
SELECTED WORK
Case studies shaped by ownership and outcomes.
A selection of platforms, product surfaces, and client builds where I owned meaningful parts of the engineering work across frontend, backend, data, and delivery.
2024 - 2025
ProtoKOLs
AI-powered analytics product for influencer research, project tracking, and narrative monitoring across social and on-chain data.
100K+ influencer workflows~40% lower API costsDashboards plus backend pipelines
View Case Study
2026
Pursuit of X
Multi-portal career platform spanning a private API, interactive onboarding, events and opportunities, partner and employer tooling, admin analytics, and AI-assisted reflection.
Private API with keys, scopes, docs, and logsStudent, employer, partner, and admin flowsMatching, exports, and AI reflection tooling
View Case Study
2026
HubsAI
Motion-heavy landing experience for a tokenized retail concept, combining 3D scenes, product storytelling, rewards, kiosk flows, and airdrop surfaces.
Spline-powered sections3D kiosk and rewards storytellingVideo, gallery, and airdrop flows
View Case Study
2026
rePRICE
Full-stack trading platform spanning live dashboards, perps and spot execution, wallet funding flows, liquidity management, portfolio tracking, and admin systems.
Perps, spot, wallet, and liquidity flowstRPC, Prisma, and Supabase backendDraggable widgets and live data surfaces
View Case Study
2025
Hera Finance
Solana trading product spanning swap execution, send flows, route visualization, wallet portfolio tracking, and chart-driven dashboard surfaces.
Swap, send, portfolio, dashboardRoute tree and Sankey visualizationsJupiter and Helius integrations
View Case Study
2025
Tria
Multilingual product platform for a cross-chain wallet and card experience, combining 3D/WebGL scenes, Spline modules, and scroll-driven storytelling.
3D phone scene and Spline product flowsScroll-driven hero, grid, and card storytelling8-language platform with overview and blogs
View Case Study
2024
Liquid NFTs
NFT marketplace and collection platform combining creator tools, marketplace flows, and liquidity-backed mechanics.
Collection creation plus mintingIndexing and media handlingMarketplace and portfolio flows
View Case Study
2024
Block Central
DeFi dashboard for portfolio tracking, staking, trading, farming, and cross-chain token flows.
Analytics plus DeFi modulesWagmi and Viem migrationTrading, staking, farming flows
View Case Study
2025
Create T3 Chill App CLI
Published open-source npm CLI and starter kit for bootstrapping a production-ready Next.js stack with auth flows, access-controlled tRPC APIs, Prisma/PostgreSQL, Stripe subscriptions, typed env validation, and automated local Supabase setup.
Published open-source npm CLI packageFull auth flows and protected access tiersSupabase, Prisma, tRPC, and Stripe automation
View Case Study
2025
Indigo Protocol
Synthetic-asset protocol app and website covering dashboards, stability pools, loan flows, redemptions, governance, staking, and product education.
Stability pools, loans, redemptions, governanceReusable charts, modals, and token flowsProtocol app plus landing website
View Case Study
2025
Ern
Stablecoin yield product and dashboard built around daily Bitcoin-denominated returns, live analytics, wallet-connected deposits and withdrawals, and on-chain position tracking.
Yield simulator and market comparisonWallet-connected deposit, withdraw, and claim flowsLive BTC price, APY, and on-chain history
View Case Study
2025
Kem
Interactive fintech product platform for stablecoins, cards, and gold exposure, built around cinematic scenes, scroll choreography, and conversion-focused storytelling.
Hero, discover, trust, gold, and cards flowsGSAP, Unicorn, and Spline interactionsEducation, blog, and download surfaces
View Case Study
2025
Dash Markets
Realtime trading-game platform covering onboarding, room creation, live chart gameplay, betting flows, rankings, chat, and operator-facing admin tools.
Create room, wait, bet, and results flowsLive chart, rankings, and room chatOnboarding plus admin tooling
View Case Study
2024
xSurge
Token swap, liquidity, rewards, and gamified DeFi product centered around the xUSD ecosystem.
Swap, pool, farm, liquidityWallet and contract flowsStablecoin product surfaces
View Case Study
2025
Vibranium
Sports trading frontend spanning athlete discovery, market dashboards, trading interfaces, leaderboard analytics, portfolio tracking, learn flows, and wallet onboarding.
Home, discover, trade, leaderboard, and portfolio flowsAthlete trading panels with charts and leverage controlsResponsive shell, onboarding, and wallet connection UX
View Case Study
2023
Dappd Website
Marketing site for a web3 development agency, focused on clarity, credibility, and lead generation.
Responsive marketing siteDesign and content implementationService-led positioning
View Case Study
2017 - 2021
Game Development
Before moving fully into software engineering, I worked as a game developer across Unreal Engine projects spanning level design, environment design, gameplay scripting, interaction logic, real-time lighting, and world-building for both portfolio and production work.
Unreal Engine level design and world buildingGameplay scripting, interaction logic, and prototypingEnvironment design, lighting, and cinematics
View ArtStation
WRITING
Engineering deep-dives and lessons from production.
Technical write-ups on architecture decisions, performance patterns, and real problems solved across the systems I build.
April 12, 2026·12 min read
PDF to Thumbnail in Milliseconds: MuPDF WASM, 3-Layer Caching, and Zero Wasted Renders
How to render exactly one thumbnail per PDF, ever: MuPDF WASM in-process rendering, a 3-layer Redis/S3/generation cache with content-addressable SHA-256 keys, Promise.withResolvers() request coalescing that collapses concurrent callers into a single inflight operation, local concurrency lanes with zero-poll callback handoff, and a 204 no-store failure response that keeps errors from sticking in any cache.
CachingWebAssemblyS3RedisPerformance
Read Article
March 5, 2026·18 min read
Don't Cache the Silence: Self-Healing Audio Resolution for Earnings Calls
The engineering behind earnings call audio: how a single quarter field eliminates an entire class of N+1 requests, why null is deliberately never cached so the system stays self-healing during peak traffic hours, how reading one HLS playlist tag determines live stream state without any polling, and a dual TTL strategy that matches cache freshness precisely to the rate at which data changes.
CachingHLSReal-TimeAPI Design
Read Article
February 10, 2026·20 min read
Fanning Out Tickers: Real-Time Price Distribution Across Server Instances Without a Message Broker
How a single upstream WebSocket connection fans live market prices out to browser clients across multiple backend instances: Redis pub/sub as a signaling layer, PUBSUBCHANNELS-driven subscriptions that mirror actual browser demand with zero manual management, metrics-on-write recomputation that makes all reads free, a staleness sweep with built-in retry backoff, and a frontend that patches TanStack Query cache directly without any bespoke state management.
WebSocketRedisReal-TimePub/Sub
Read Article
January 18, 2026·22 min read
Inside a Custom Distributed Task Scheduler: Redis Locks, Heartbeats, and Zero-Poll Concurrency
A deep technical breakdown of a production distributed task scheduler built without BullMQ: instance heartbeats with recursive setTimeout, controller election over Postgres, in-process locks using a Map of resolve callbacks, global Redis SET NX locks with pub/sub notification instead of polling, Postgres-backed durable tasks that survive instance crashes, and the full background price pipeline as a working end-to-end example.
RedisDistributed SystemsSchedulingArchitecture
Read Article
EXPERIENCE
Full-time roles and selected contract work.
Work spanning analytics platforms, agency delivery, interactive web experiences, and transaction-heavy products where strong ownership mattered more than narrow specialization.
Jul 2025 - Mar 2026
Senior Full-Stack Engineer
v21 Studio, Remote, United Kingdom
- Led end-to-end delivery across 25+ client products, spanning trading platforms, DeFi protocol applications, data-rich dashboards, interactive 3D experiences, AI-driven workflows, and financial products.
- Spearheaded technical direction across high-stakes client engagements, partnering directly with founders and designers to define architecture and establish engineering standards.
- Shipped at the pace and quality expected of a top-tier UK design studio while ensuring projects were scoped and built for performance, scalability, and long-term maintainability.
Aug 2024 - Jul 2025
Full-Stack Engineer
ProtoKOLs, Remote, British Virgin Islands
- Built data-dense analytics dashboards, influencer scoring tools, narrative monitoring surfaces, watchlists with alerts, activity trackers, and exportable campaign reports.
- Worked across a platform processing millions of social events and tracking 100K+ influencer profiles.
- Engineered backend data pipelines, AI-powered classification workflows, Redis caching layers, and background worker systems that cut third-party API costs by roughly 40% while maintaining data freshness and accuracy.
Mar 2023 - Jul 2024
Full-Stack Engineer
Dappd, Remote, United States
- Shipped multiple production financial products for separate clients, including DeFi dashboards, a DEX with swap, farming, and lottery mechanics, and a creator NFT marketplace with collection deployment and trading flows, enabling 100K+ user transactions across live platforms.
- Owned full-stack delivery across contract-connected transaction flows, real-time price feeds, on-chain transaction pipelines, and integration upgrades across live platforms handling six-figure TVL.
- Worked across frontend implementation, backend APIs, and Web3 integrations for transaction-heavy products in production.
Apr 2024 - Jun 2024
Contract Full-Stack Engineer
Thinker Friends Studio, Remote, Panama
- Delivered an interactive 3D web experience using Three.js, WebGL, and Next.js to support product storytelling and seed-round fundraising.
- Owned the browser implementation across motion, scene composition, and interaction design with a focus on smooth performance and visual polish.
- Turned a narrative-heavy concept into a presentation-quality web experience suited for investor conversations.
Jun 2021 - Feb 2023
Full-Stack Engineer & Game Developer
Monkey Empire, Remote, France
- Engineered backend reward systems, token infrastructure, and on-chain product workflows for a blockchain game that scaled to 10,000+ active users, contributing to a $100K Arbitrum development grant.
- Built gameplay and product systems around reward distribution, progression loops, and token-backed flows.
- The role deepened my shift from game development into software engineering across product, backend, and token-backed systems.
2017 - 2021
Game Developer & Level Designer
Independent and Early Team Projects
- Started in game development before moving fully into software engineering, building Unreal Engine work across level design, environment design, gameplay scripting, and interaction logic.
- Worked on gameplay spaces, interaction flows, environment composition, lighting, blockouts, and real-time scene building across prototypes, maps, and cinematic showcases published on ArtStation.
- That mix of design and programming shaped how I approach product engineering today: systems thinking, interaction design, fast iteration, and technical execution.
OPEN TO SELECT OPPORTUNITIES
Let's build the next version of your product.
Share the product, stage, and problem space. I usually reply within 24 hours.
Based in Sri Lanka, working comfortably across US, UK, and European time zones.