Team Lead

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 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.

#### 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 [email protected].

For more vacancies, visit: xsolla.com/careers