Oleksandr Tkach

Specialization

Software Engineer & Web3 Architect

Based in

Lviv, Ukraine

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Let's meet!

I'm Oleksandr Tkach. Software Engineer & Web3 Architect.

Name: TUWA SDK
Author: Oleksandr Tkach

Portfolio

Key Projects I've Contributed To

Quasar

Transaction indexing and cloud sync backend with webhooks, multi-tenant auth and billing — running as a managed SaaS and published as the open-source, self-hosted Quasar Community Edition (Apache-2.0).

Next.jsNestJSPostgreSQLRedisDrizzle ORMPayload CMSDockerBullMQTraefikGitHub ActionsViemSolana Kit

Editions

Quasar Cloud Community Edition Live Showcase

TUWA Open Source Packages

A suite of lightweight, framework-agnostic, and type-safe libraries built for decentralized applications. Features state-management engines, multi-chain utility helpers, wallet connection management, and CAIP-122 standard authentication (SIWX).

TypeScriptZustandImmerReactViemSolana KitWagmiTailwind

Ecosystem Packages

Orbit Utils SIWX Pulsar Engine Satellite Connect Nova UI Kit Quasar SDK

About me

From UI Components to Multi-Chain Architecture.

My journey in web3 development started with the early days of the Aave Protocol, where I was mainly responsible for the App UI transformation across V1, V2, and V3. Later, at BGD Labs, I focused mostly on governance interfaces for the Aave ecosystem and optimizing direct RPC interactions to save costs and improve speed. This experience led me to create TUWA. Building these tools helped me evolve from just writing code to understanding the full architecture of a product.

Resume

Education and practical experience.

My journey through education and professional development in software engineering.

Open source projects

Self-Hosted Transaction Indexing Engine (Quasar Community Edition)

2026 - Present

TUWA (Core Open Source)

Apache-2.0 single-tenant edition of Quasar: NestJS engine with two-phase EVM & Solana tracking, partitioned PostgreSQL, signed webhooks and a Payload admin with TOTP 2FA. Generated from the production codebase by an automated pipeline (dead-code pruning, leak gates) and released after every production deploy as signed Docker images.

NestJSPostgreSQLBullMQPayload CMSDockerGitHub Actions

Chain-Agnostic Auth Engine (SIWX)

2025 - Present

TUWA (Core Open Source)

A pure CAIP-122 engine for chain-agnostic sign-in messages. Provides EVM (EIP-191/1271) and Solana (ed25519) adapters for sovereign session validation.

TypeScriptViemSubtleCryptoNPM

Multi-Chain Core Utilities (Orbit Utils)

2025 - Present

TUWA (Core Open Source)

A framework-agnostic, multi-chain utility library for Web3 dApps. Abstracts blockchain RPC complexity and provides lightweight client wrappers.

TypeScriptViemWagmiSolana KitNPM

Web3 Transactions Tracking (Pulsar Core)

2025 - Present

TUWA (Core Open Source)

A powerful library for tracking multi-chain transaction lifecycles. Solves the complexity of cross-chain state management for developers.

TypeScriptViemWagmiSolana KitNPM

Web3 Wallet Connection (Satellite Connect)

2025 - Present

TUWA (Core Open Source)

A headless state management system for Web3 wallet connectivity. Provides unified interfaces for EVM and Solana wallet standard integrations.

TypeScriptZustandImmerViemSolana KitNPM

Polished Web3 UI Kit (Nova UI Kit)

2025 - Present

TUWA (Core Open Source)

A premium, modular React component library providing unified and polished Web3 user interfaces for wallet connection and transaction lifecycle tracking.

ReactTypeScriptTailwind CSSFramer MotionNPM

Quasar Node.js & Edge SDK (Quasar SDK)

2025 - Present

TUWA (Core Open Source)

The official server-side Node.js and Edge-compatible SDK for interacting with Quasar transaction indexing and cloud synchronization persistence layers.

TypeScriptNode.jsREST APINPM

Work experience

Founder & Lead Architect

Aug 2025 - Present

TUWA (Core Open Source)

Architecting the TUWA serverless multi-chain ecosystem. Developing core NPM packages for transaction tracking (Pulsar) and wallet connection (Satellite). Designed and built Quasar, a high-performance cloud persistence and indexing SaaS backend, enabling real-time transaction state synchronization across user devices, and open-sourced it as the self-hosted Quasar Community Edition with an automated private-to-public release pipeline.

ReactNext.jsSolanaEVMNestJSPostgreSQLRedis

Software Engineer

Apr 2022 - Mar 2025

BGD Labs

Developed cross-network web3 user interfaces with direct RPC interaction. Built the Aave Governance V3 interface and internal data tools to reduce infrastructure costs by 30%.

Next.jstRPCZustandViemWagmi

Frontend Developer

Sep 2019 - Feb 2022

Aave

Responsible for the UI transformation of the Aave Protocol across V1, V2, and V3. Collaborated closely with smart contract teams to ensure secure and intuitive DeFi interactions.

ReactTypeScriptEthers.jsGraphQLSASS