Senior Fullstack Engineer

xsolla· Web3
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🌍 Remote📍 Moscow📍 Perm📍 RussiaFull time

About this role

ABOUT US

Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. From indie to AAA, companies partner with Xsolla to help them fund, distribute, market, and monetize their games. Grounded in the belief in the future of video games, Xsolla is resolute in the mission to bring opportunities together, and continually make new resources available to creators. Headquartered and incorporated in Los Angeles, California, Xsolla operates as the merchant of record and has helped over 1,500+ game developers to reach more players and grow their businesses around the world. With more paths to profits and ways to win, developers have all the things needed to enjoy the game.

For more information, visit xsolla.com.

 

About the project

     

    Xsolla ZK is building a cross-game infrastructure that empowers gamers to freely trade and use their digital assets without barriers. As a Fullstack Engineer, you'll work across the entire stack:

    Products:

    • Xsolla Bazaar — NFT marketplace for trading digital assets

    • Web3 Backpack — Smart wallet with account abstraction

    • Web3 SDKs — Developer toolkits for blockchain integration

    • Admin Panels — Internal tools for managing Web3 operations

      • Tech Stack:

      Backend:

      • Language: Go (go-ethereum, ethkit)

      • Databases: MongoDB, PostgreSQL, Redis

      • API: REST, WebSocket, gRPC, OpenAPI (Swagger)

      • Message Queue: NATS, RabbitMQ, Kafka

      • Blockchain Infrastructure:

      • ZK Stack / ZKsync Era (EraVM, system contracts, native Account Abstraction)

      • Account Abstraction (ERC-4337): EntryPoint, UserOperation lifecycle, bundlers, paymasters

      • Ethereum L1 integration, abigen contract bindings

        • Frontend:

        • Languages: JavaScript (ES6+), TypeScript

        • Frameworks: React, Next.js, React Native

        • State Management: RTK, Zustand

        • Styling: Tailwind CSS, Tamagui, CSS-in-JS

        • Web3 Libraries & Standards:

        • Wallet provider standards: EIP-1193, EIP-6963 (multi-wallet discovery), EIP-5792 (batched calls)

        • ethers.js, viem for Ethereum interactions

        • wagmi for React hooks

        • WalletConnect for multi-wallet support

        • Embedded/AA wallet SDK (e.g. Sequence, thirdweb, Privy, Dynamic, or equivalent) for social-login smart accounts

          • Infrastructure:

          • DevOps: Docker, Kubernetes, GitLab CI/CD

          • Monitoring: Graylog, Prometheus

            • Key Technical Challenges:

            • Full-Stack Web3 Features: Building end-to-end flows from smart contract events to real-time UI updates

            • Account Abstraction Integration: Implementing embedded/smart-account wallets with social auth, ERC-4337 UserOperation flows, and gasless transactions via paymasters

            • ZK Stack Backend: Working with EraVM differences, native Account Abstraction on zkSync-family chains, handling L1↔L2 bridging operations

            • Signature & Session Handling: Implementing EIP-712 signing, ERC-1271 verification, and session-key-scoped permissions for in-game transactions

            • Cross-Platform Consistency: Sharing business logic between web and mobile using React/React Native

              •  

Responsibilities

     

    Backend Development:

    • Develop backend services in Go using go-ethereum/ethkit for wallet operations and blockchain interactions

    • Implement and monitor the ERC-4337 UserOperation lifecycle (prepare→sign→submit→confirm) against bundlers and paymasters

    • Implement smart contract interaction layer with abigen-generated Go bindings

    • Build Account Abstraction support: paymaster gas-sponsorship logic, session-key issuance (ERC-7710 / ERC-7715) for gameplay transactions

    • Design BFF services orchestrating data from multiple blockchain sources, indexers, and wallet infrastructure providers

      • Frontend Development:

      • Build responsive applications using React/Next.js integrated with an embedded/AA wallet SDK

      • Implement Embedded Wallet flows: social auth (Google, Apple), email login, passkey (WebAuthn/P-256) support

      • Create Web3-enabled UIs using wagmi hooks and viem for contract reads/writes, following EIP-1193/EIP-6963 provider standards

      • Implement transaction confirmation flows that clearly convey what the player is approving (EIP-712 typed-data signing)

      • Develop real-time features with WebSocket subscriptions for blockchain events

      • Build cross-platform components with Tamagui for web and React Native

        • Full-Stack Integration:

        • Design and implement complete features from smart contract events to UI updates

        • Handle ZK Stack specifics: EraVM gas model differences, native Account Abstraction, L1↔L2 bridging UI flows

        • Implement transaction tracking: status polling, reorg handling, user notifications

        • Create admin panels for managing NFT drops, marketplace settings, and analytics

        • Write comprehensive tests for both backend (Go) and frontend (Jest, React Testing Library)

        • Document APIs using OpenAPI/Swagger and maintain technical documentation

          •  
           

           

Nice to Have

     

    Required:

    Backend Skills:

    • 3+ years of commercial experience with Go

    • Strong knowledge of REST API design and implementation

    • Experience with MongoDB and/or PostgreSQL

    • Understanding of microservices architecture

      • Frontend Skills:

      • 3+ years of experience with React and modern JavaScript/TypeScript

      • Proficiency in state management solutions (Redux, Zustand, etc.)

      • Experience with responsive design and CSS frameworks

      • Understanding of web performance optimization

        • General:

        • Experience with Git and CI/CD pipelines

        • Familiarity with Docker and containerization

        • Strong problem-solving and communication skills

          • Preferred:

          Web3 & Blockchain:

          • Working knowledge of ERC-4337 Account Abstraction: EntryPoint, UserOperation lifecycle, bundler/paymaster roles

          • Understanding of session keys and delegated permissions (ERC-7710 / ERC-7715) and signature schemes (EIP-712, ERC-1271, WebAuthn/passkey)

          • Familiarity with wallet provider standards: EIP-1193, EIP-6963, EIP-5792

          • Exposure to an embedded/AA wallet SDK (Sequence, thirdweb, Privy, Dynamic, Turnkey, or equivalent):

          • Embedded Wallet integration (social auth, passkeys)

          • Indexer/data-availability integration for balance/activity tracking

          • Gas-sponsorship / transaction-relay APIs

          • Knowledge of ZK Stack / ZKsync Era:

          • Understanding of EraVM vs EVM differences

          • L1↔L2 communication patterns

          • Native Account Abstraction on zkSync-family chains

          • Experience with ethers.js, viem, and wagmi for React

          • Understanding of smart contract interaction: ABI, events, transaction lifecycle

          • Knowledge of token standards (ERC-20, ERC-721, ERC-1155)

            • Additional:

            • Experience with Next.js SSR/SSG and App Router

            • Familiarity with React Native and Tamagui for cross-platform

            • Understanding of WebSocket for real-time blockchain events

            • Knowledge of Kubernetes and cloud infrastructure

BENEFITS

We are passionate about fostering a supportive environment for our team, so we prioritize the physical, mental, and emotional well-being of our employees and their families through a comprehensive Benefits Program. This includes medical, dental, and vision, PTO, and a personalized career roadmap for each employee. By investing in professional development through training and educational opportunities, we ensure that our team thrives both personally and professionally. Together, we’re not just building a business; we’re cultivating a community that values creativity, collaboration, and the transformative power of play. 

EQUAL EMPLOYMENT OPPORTUNITY STATEMENT

Xsolla is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate based on race, color, religion, sex, national origin, age, disability, sexual orientation, gender identity, or any other characteristic protected by law.

We consider qualified applicants with criminal histories in accordance with the Fair Chance Act.

Criminal History Consideration:

For this position, we will conduct a background check that may include:

  • Criminal history check

  • Employment verification

  • Education verification

Relevance to Job Responsibilities:

The background check is relevant to this position because of the following role responsibilities:

  • Handling sensitive financial information and blockchain transactions

  • Accessing confidential company data and user information

  • Ensuring compliance with regulatory requirements

Rights Under the Fair Chance Act:

Applicants are encouraged to inquire about their rights under the Fair Chance Act. If you have questions regarding our hiring practices, please contact careers@xsolla.com.

CONTACT

If you have questions regarding our hiring practices, please contact careers@xsolla.com.

For more vacancies, visit: xsolla.com/careers

Frequently Asked Questions

Is the salary disclosed for the Senior Fullstack Engineer position at xsolla?
The salary for this Senior Fullstack Engineer role at xsolla is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Is the Senior Fullstack Engineer job at xsolla remote?
Yes, this Senior Fullstack Engineer position at xsolla is remote, with team members based in Moscow, Perm, Russia. You can work from home or anywhere in the supported regions.
Is the Senior Fullstack Engineer role at xsolla full-time or part-time?
This is listed as a Full time position. It is posted as a Senior Fullstack Engineer role in the Web3 department at xsolla.
Which team or department does the Senior Fullstack Engineer at xsolla belong to?
This Senior Fullstack Engineer position is part of the Web3 department at xsolla. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Senior Fullstack Engineer position at xsolla?
Click the "Apply Now" button on this page. You will be redirected to xsolla's official application portal hosted on lever where you can submit your application directly.
When was the Senior Fullstack Engineer job at xsolla posted?
This Senior Fullstack Engineer position at xsolla was posted on Sep 29, 2026. Apply as soon as possible — early applications are often reviewed first.
Senior Fullstack Engineer
xsolla
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