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Web3 Fullstack Engineer

3 weeks, 4 days ago
Serbia
Full-time
Senior
Blockchain Developer
Software Development
Blockchain CI/CD Git Go Kafka Kubernetes NATS Node.js PostgreSQL React Solana TypeScript
Apply Now
Xsolla

Xsolla

Xsolla is an international payment solution provider for online games, offering tools to launch, monetize, and scale games worldwide with local payment methods and fraud prevention.

Internet Software & Services
251-1K
Founded 2005
View All Jobs 90

Description

  • Design and ship seamless web2 ↔ web3 user flows, including custodial and non-custodial wallets, account abstraction, gasless transactions, and fiat on-ramps.
  • Build and maintain systems for the full digital item lifecycle, including minting, ownership, transfer, trading, redemption, and retirement.
  • Deliver fullstack features across wallet-connected frontends, backend services, smart contracts, and indexing layers.
  • Design data models and APIs that represent items consistently across databases, custodial wallets, and on-chain state.
  • Ensure correctness and reliability for value-moving workflows through idempotency, reconciliation, replay safety, and recovery paths.
  • Integrate with EVM chains, token standards, indexers, and marketplace settlement flows behind clean internal interfaces.
  • Collaborate with product, security, payments, and game-facing teams to translate business needs into technical plans and documentation.
  • Reason about trust, custody boundaries, and which functionality should live on-chain versus off-chain.

Requirements

  • Hands-on experience bridging web2 systems with web3 infrastructure, including wallet onboarding and custodial vs. non-custodial trade-offs.
  • Working knowledge of EVM chains and Solidity, including reading, integrating with, and assessing contract safety.
  • Practical understanding of ERC-20, ERC-721, and ERC-1155 token standards.
  • Experience keeping blockchain state consistent with off-chain databases through indexing, event ingestion, reorg handling, and reconciliation.
  • Strong TypeScript and React skills for building production-grade interfaces.
  • Experience with wallet connectivity and web3 client libraries such as wagmi, viem, ethers.js, WalletConnect, or embedded/social login wallets.
  • Solid backend engineering experience with Node.js and Go, including clean APIs, concurrency, and performance under load.
  • Experience with distributed systems, especially around consistency, availability, and failure modes in value transfer workflows.
  • Experience with PostgreSQL schema design, query optimization, and migrations at scale.
  • Experience deploying, operating, and debugging services in Kubernetes, plus familiarity with Kafka or NATS and modern Git/CI/CD practices.
  • Experience building for game developers, publishers, or players, especially in-game items, economies, or ownership.
  • Preferred: experience building NFT marketplaces, item trading, or secondary-market/settlement systems.
  • Preferred: familiarity with blockchain indexing tools such as The Graph or custom indexers, and node/RPC infrastructure.
  • Preferred: experience with account abstraction (ERC-4337), smart wallets, or paymaster/relayer setups.
  • Preferred: background in payments or fiat on-ramp integration bridging traditional commerce and crypto.
  • Preferred: experience with non-EVM ecosystems such as Solana or cross-chain/bridging patterns.
  • Preferred: familiarity with security and compliance topics such as custody, key management, audit logging, and KYC/AML touchpoints.
  • Preferred: contributions to open-source web3, wallet, or tooling projects.
  • Preferred: hands-on experience with modern AI tools such as Claude, Copilot, or Cursor for engineering work.
  • Strong written communication skills and the ability to produce designs and decisions that stand on their own across time zones.

Interested in this position?

Apply directly on the company website

Apply Now

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