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 YOU

We are looking for a Team Lead who is passionate about building and leading teams that create cutting-edge blockchain infrastructure to join our Xsolla ZK team. The best candidate will be someone who thrives in a fast-paced, highly collaborative, and exceptionally dynamic setting and is excited to lead a team of backend engineers developing Web3 products while maintaining hands-on technical contribution.

Strong backend development expertise in Go combined with leadership skills are essential, along with experience in building high-load distributed systems and managing engineering teams. The ability to balance technical excellence with people development and delivery predictability will be key to your success in this role.

If you're passionate about growing engineering talent while shipping world-class blockchain products and love shaping the technical direction of next-generation gaming infrastructure, we would love to hear from you!

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 Team Lead, you'll lead a team working on:

• Xsolla Bazaar — NFT marketplace backend for trading digital assets across multiple blockchains
• Web3 Backpack — Smart wallet backend with ZK SSO 4337 account abstraction
• Blockchain Services — Event scanners, transaction processors, indexers
• Web3 APIs — Developer-facing APIs and SDKs for game integration

Tech Stack:

Language: Go (go-ethereum, ethkit; idiomatic concurrency, performance profiling)
Databases: MongoDB, PostgreSQL, Redis
Message Queue: NATS, RabbitMQ, Kafka
API: REST, WebSocket, gRPC, OpenAPI (Swagger)
Account Abstraction (ERC-4337): EntryPoint (v0.6–v0.8), UserOperation lifecycle, bundler/paymaster roles, validation rules (ERC-7562), signature validation for undeployed accounts (ERC-6492)
Smart Account Standards: Modular account standards (ERC-7579 / ERC-6900), session keys and delegated permissions (ERC-7710 / ERC-7715), EIP-7702 EOA delegation awareness
Signature & Wallet-Facing Standards: EIP-712 typed data, ERC-1271 contract signatures, WebAuthn/passkey (P-256), EIP-1193, EIP-6963, EIP-5792, ERC-7677 paymaster interfaces
ZK Stack / ZKsync Era: EraVM, system contracts (ContractDeployer, NonceHolder), bootloader, zksolc/zkvyper compilers, native Account Abstraction, L1↔L2 messaging and finality
Ethereum L1: go-ethereum, abigen, RPC and indexer semantics
Smart Contracts: Solidity, ERC-20/721/1155, upgradeability and migration patterns
Custody: Key management fundamentals (HSM, MPC/threshold signing) relevant to backend wallet operations
Infrastructure: Docker, Kubernetes, GitLab CI/CD, Graylog, Prometheus

Team Scope:

Team of up to 8 backend engineers
Ownership of one or more service domains within the Web3 ecosystem
Direct collaboration with Product, Frontend, Blockchain/Solidity, and DevOps teams

Responsibilities

Technical Leadership (60%):

Architect Web3 backend systems leveraging ZK Stack infrastructure and ERC-4337 Account Abstraction primitives
Define technical strategy for the UserOperation lifecycle: bundler/paymaster integration, gas-sponsorship strategy (what gets sponsored, how it's metered, capped, and defended from abuse)
Lead ZK Stack / ZKsync Era integration decisions: EraVM-specific optimizations, native Account Abstraction, L1↔L2 bridging architecture, system contract interactions
Design session-key and permission primitives (ERC-7710 / ERC-7715): scoped, time-limited, contract-allowlisted authority for prompt-free gameplay transactions
Own the signing and confirmation flow: EIP-712 typed data, ERC-1271 verification, WebAuthn/passkey signers, and wallet-facing standards (EIP-1193, EIP-6963, EIP-5792)
Oversee smart contract interaction layer: abigen code generation, factory dependencies handling, upgradeability and migration patterns
Review complex code focusing on blockchain-specific edge cases: reorg handling, transaction finality, gas estimation failure modes on L2
Identify systemic risks (key management, signature phishing, bundler/RPC dependencies) and lead initiatives to resolve them before they become incidents
Drive improvements in blockchain observability: transaction tracking, event monitoring, on-chain analytics
Maintain hands-on contribution to critical features involving multi-chain operations

People Management (40%):

Lead and mentor a team of up to 8 backend engineers
Conduct regular 1:1s, performance reviews, and career development conversations
Hire and onboard new team members
Foster a culture of technical excellence, collaboration, and continuous learning
Manage team workload and ensure sustainable delivery pace

Delivery & Process:

Own team's delivery predictability and sprint commitments
Collaborate with Product to refine requirements and estimate work
Report on team progress, risks, and blockers to stakeholders
Continuously improve development processes and team efficiency

Nice to Have

Required:

Technical Skills:

• 5+ years of commercial experience with Go (or 7+ years with other backend languages with Go proficiency)
• Strong expertise in distributed systems and microservices architecture
• Deep knowledge of MongoDB, PostgreSQL, and Redis
• Experience with message queues (NATS, RabbitMQ, Kafka)
• Solid understanding of API design (REST, WebSocket, gRPC)
• Experience with Docker, Kubernetes, and CI/CD pipelines
• Blockchain development experience:
• Ethereum/EVM smart contract interaction (go-ethereum, abigen)
• Understanding of transaction lifecycle, gas models, nonce management
• Experience with token standards (ERC-20, ERC-721, ERC-1155)
• Working knowledge of ERC-4337 Account Abstraction: EntryPoint, UserOperation lifecycle, bundler/paymaster roles, gas estimation failure modes

Leadership Skills:

• 2+ years of experience leading engineering teams
• Track record of mentoring and developing engineers
• Experience with agile methodologies and sprint planning
• Strong communication skills for technical and non-technical stakeholders
• Ability to balance hands-on coding with management responsibilities

Preferred:

Experience with ZK Stack / ZKsync Era:
EraVM execution model and differences from EVM, native Account Abstraction on zkSync-family chains
System contracts (ContractDeployer, NonceHolder, etc.)
L1↔L2 communication, bridging, and finality/reorg behavior
Deeper Account Abstraction & smart wallet exposure:
Modular account standards (ERC-7579 / ERC-6900) and experience building on/extending implementations (Safe, Kernel, Biconomy, Coinbase Smart Wallet, or equivalent)
Session keys and delegated permissions (ERC-7710 / ERC-7715)
Signature schemes: EIP-712, ERC-1271, WebAuthn/passkey, and wallet-facing standards (EIP-1193, EIP-6963, EIP-5792, ERC-7677)
Familiarity with AA infrastructure providers (Sequence, thirdweb, Privy, Dynamic, Turnkey, Pimlico, Alchemy, ZeroDev, Safe{Core}) and views on build-versus-buy trade-offs
Exposure to key management: HSM, MPC/threshold signing, social recovery or guardian-based recovery
Knowledge of smart contract development (Solidity basics, security patterns) and wallet threat modeling (signature phishing, replay, paymaster griefing)
Experience with blockchain event processing: event scanning, reorg handling, webhooks
Background in gaming or fintech industries with high-load systems
Experience with remote team management

WHAT SUCCESS LOOKS LIKE

First 3 months:

• Onboard and understand the codebase, architecture, and team dynamics
• Establish regular 1:1s and team rituals
• Deliver at least one significant feature or improvement

First 6 months:

• Improve team's delivery predictability and code quality metrics
• Identify and address technical debt in key areas
• Develop career growth plans for all team members

First year:

• Team consistently delivers on commitments with high quality
• Measurable improvement in system performance and reliability
• Team members show clear growth and development

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 through a comprehensive Benefits Program. This includes:

• Unlimited Flexible Time Off for work-life balance
• Private health insurance with dental coverage for you and your family
• Personalized career roadmap with clear growth paths
• Professional development through training, conferences, and educational opportunities
• Annual corporate events and team gatherings
• Remote-first culture with flexible working hours (10:00–19:00)
• Leadership development programs and coaching
• Competitive compensation reflecting leadership responsibilities

Together, we're not just building a business; we're cultivating a community that values creativity, collaboration, and the transformative power of play.

EMPLOYMENT DETAILS

Location: Remote (worldwide)
Employment Type: Full-time
Schedule: 10:00–19:00 (flexible)
Contract: Employment agreement (entity or EOR arranged per candidate location)

EQUAL EMPLOYMENT STATEMENT

Xsolla is dedicated to creating a diverse environment and is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, language, sexual orientation, national origin, genetics, political beliefs, disability, age, marital status, social background or other characteristics.

We are committed to compliance with all fair employment practices regarding citizenship and immigration status.

CONTACT

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

For more vacancies, visit: xsolla.com/careers