Location: Russia
Workplace: remote
ABOUT XSOLLA
Xsolla is a global video game commerce company headquartered in Los Angeles. It helps developers from indie to AAA fund, distribute, market and monetize their games, and acts as merchant of record for 1,500+ developers worldwide. For more information, visit xsolla.com.
The role
We are hiring a
Software Engineer, Web3
for
Xsolla
ZK
,
Xsolla
's Web3 ecosystem on a zkSync-based L2. It includes:
smart wallets built on account abstraction;
SDKs that game studios and partners use to bring players on-chain;
infrastructure backend services for tokenizing in-game items and currencies;
ecosystem dApps: a
DEX
, an
NFT
marketplace and an auction.
This is a senior fullstack role: you work across backend, frontend and smart contracts.
WHAT YOU WILL OWN
Features end to end: backend, frontend and production
The on-chain / off-chain architecture of your product: what lives in contracts, what lives in services, and how the two stay consistent. You make these decisions and justify them in writing
Security and correctness of what you ship: signing flows, interactions with contracts that hold user assets, keys and secrets
Production operation of your services, as part of the team's on-call rotation
WHAT YOU WILL DO
Build backend services in Go and TypeScript: chain indexing, transaction relaying, event processing, APIs for dApps and SDKs
Build infrastructure backend services for tokenizing in-game items and currencies
Build dApp frontends in React: wallet connection, transaction signing, on-chain state in the UI
Integrate smart wallets into products: accounts, paymasters, bundlers
Develop SDKs used by game studios and partners
Monitor services and contracts in production and take part in on-call
Review code
Set up and maintain AI tooling in the repositories (Claude Code, Codex, Cursor: rules, context, harness) so the team uses it effectively
Required
Experience
5+ years of commercial software development, with senior-level production experience across backend and frontend
dApps that you shipped to production and maintained
Web3 libraries and wallets
viem and wagmi in production: clients and transports, contract reads and writes with typed ABIs, event subscriptions, wagmi hooks and connectors, caching and invalidation of on-chain state
How wallet signers work: EOAs, browser and embedded wallets, smart accounts; personal_sign (EIP-191) and typed data (EIP-712); the EIP-1193 provider; network switching
Hands-on experience with smart wallets: UserOperations, gas sponsored via paymasters, signature validation for contract accounts (ERC-1271)
Backend
Go and TypeScript (Node.js) for production services
Processing on-chain events: idempotency, reorg handling, retries
Asynchronous messaging and event-driven design (Kafka, RabbitMQ or
NATS
): delivery guarantees, ordering, reprocessing
Relational databases (PostgreSQL) and caching (Redis)
Designing REST and gRPC APIs: versioning, backward compatibility
Frontend
React and TypeScript: rendering model, state management, performance
Web security fundamentals:
XSS
,
CSRF
,
CSP
, safe handling of signatures and keys in the browser
Smart contracts
Reading and understanding Solidity contracts and the
EVM
(storage, gas, call semantics, proxy upgrade patterns, access control) well enough to integrate with them safely and review changes
Common contract vulnerability classes (reentrancy, front-running /
MEV
, oracle manipulation, signature replay) and how they affect the off-chain side
Operations
Containers and orchestration (Docker, Kubernetes) at the level of deploying and debugging your own services
Observability (we use Datadog; experience with Prometheus, Grafana, ELK / Graylog or OpenTelemetry also counts): metrics, logs, tracing and alerting for services and contracts; diagnosing incidents in production
Engineering practices
Testing: unit, integration, E2E
Git, CI/CD (GitLab CI or similar)
AI-assisted engineering
Daily hands-on use of AI coding tools (Claude Code, Codex, Cursor) for development and review, including configuring them for a repository
English
Spoken English at B2 level or higher
Nice to have
zkSync /
ZK
Stack and the specifics of the
zk
-rollup stack
Designing, writing and testing smart contracts in Solidity with Foundry; deploying and upgrading them safely
Building ERC-4337 infrastructure yourself (bundlers, paymasters); EIP-6963, EIP-5792
DeFi:
DEX
and
AMM
mechanics
NFTs and marketplaces: ERC-721, ERC-1155, auction mechanics
L2 infrastructure: running nodes, indexers, bridges
Designing SDKs for external developers
Gaming domain experience
HOW WE WORK
Decisions in writing. Significant technical decisions are written up as an RFC or ADR that lays out the options and trade-offs. We discuss the document, not a blank whiteboard.
AI is part of everyday engineering. We use AI coding tools for development and review, and we treat configuring them for a codebase as real engineering work.
HOW WE HIRE
Intro call. Your background, your motivation and the role.
Technical interview. Built directly on the What you will own and Required sections above. We won't ask about anything this posting doesn't promise.
Bar raiser. An engineer from outside the hiring team checks that you raise the overall engineering bar.
THE TEAM
You will work alongside product managers, designers, smart contract, backend and frontend engineers, QA and DevOps.
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
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.
Задачи:
— Разработка продуктовых фичей маркетплейса Джум
— Повышение конверсии и проходимости платежей, расширение списка платёжных провайдеров, интеграции, PCI DSS контур
— Улучшение системы авторизации
— Поддержка инфраструктуры и проектировании миграций
— Диагностирование и повышение доступности клиентских сервисов
Требования:
— Уверенное знание одного из языков программирования: Go / Java / Kotlin / C++ / Python / Scala
— Опыт разработки сложных проектов
— Отличная алгоритмическая подготовка
— Опыт разработки под Linux / Unix
— Будет плюсом: опыт работы с highload, опыт работы с MongoDB, опыт работы с Kubernetes
Условия:
— Прозрачность и Стабильность: фиксированный оклад, performance-based бонусы
— Office-first: гибкий график с гибридным форматом работы (3 дня в офисе, 2 удаленно) и компенсация питания в офисе
— Забота о сотрудниках: медицинская страховка (включая стоматологию) для сотрудников и их детей, 100% оплата больничных
— AI-first подход: лицензии и доступы к большому количеству AI инструментов
— Рост и Развитие: возможность карьерного роста, обучения и ротации между командами компании, воркшопы для обмена знаниями, курсы английского языка
— Международная команда: работа с коллегами из Армении и Китая, тимбилдинг с командой раз в год и поддерживающая корпоративная культура
ГибридseniorМосква
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Ищем Backend-разработчика (Middle+) в помощь CTO для разработки серверной части HTML5 crash-игр в iGaming-проекте XNODO Games. • разработка игровой серверной логики на Go (Python как дополнительный инструмент);
разрабатывать и развивать сервисы для обработки данных из внешних источников: сбор → матчинг и нормализация → доставка во внутренние системы; интегрировать новые источники, обеспечивать качество и стабильность поставок;
Задачи Разработка и оптимизация алгоритмов для бенчмарков, замеров и обработки различных срезов данных, в том числе картографических; Рефакторинг кода и повышение производительности сервисов и расчетов;
Проектировать технические решения для интеграционных задач разного уровня сложности, тесно взаимодействия с командами мобильных клиентов. Брать на себя ответственность за кодовую базу продукта и демонстрировать проактивный подход к улучшению качества архитектуры проекта.
Расширять и совершенствовать функционал нашего проекта, думая о запредельной нагрузке (olap и oltp). Проектировать сервисы таким образом, чтобы геораспределенность ЦОД не влияла на репликацию и сценарии использования.
Ведение технически сложных задач: от анализа БТ и проектирования до запуска в прод. Самостоятельная проработка технических решений, декомпозиция сложных задач, доведение их до прода.
What you’ll do Design, build, and evolve customer-facing backend services and public APIs by understanding how different Chainguard products and customer segments use shared platform capabilities, and ensuring APIs and services work well for all of them. Create technical design documents and drive your own design plans with clarity and confidence.
About Airship: Airship is a technology company providing a platform for managing omnichannel customer experience, trusted by leading brands like Alaska Airlines, BBC, and The Home Depot. Their platform enables seamless, unified customer experiences across multiple channels including apps, websites, email, SMS, and wallets, using a no-code, AI-powered system designed for non-technical teams.
About the Role: As a Backend Java Engineer, you will design, develop, and support distributed systems that combine scale with high reliability. You will work on low-latency services processing continuous event streams and supporting analytical workloads across terabytes of data. The backend infrastructure runs on Google Cloud Platform, using Java-based microservices and SQL and NoSQL databases. You will join a core engineering team shaping Airship’s technical foundations and engineering practices.
Tasks:
— Design data schemas and take ownership of data semantics
— Maintain, improve, and scale Java APIs and distributed services
— Investigate performance issues using server metrics, application data, and system behavior
— Improve reliability, testability, and maintainability of backend systems
— Partner with product and engineering teams on technical design and implementation
— Help define technical standards across teams
— Lead and own large-scale releases and technical projects
— Use AI as a technical assistant to draft development plans and investigate problems or bugs
— Critically assess AI-generated suggestions for accuracy, security, and suitability
Requirements:
— At least three years of experience designing, operating, and maintaining distributed systems
— Professional fluency in spoken and written French (required)
— Strong Java development skills
— Experience with unit testing, code reviews, documentation, and Git-based version control
— Experience leading significant releases or technical projects
— Familiarity with continuous integration and continuous delivery practices
— Strong written and verbal communication skills
— Collaborative and pragmatic approach to software development
— Commitment to building reliable, maintainable, and testable systems
Preferred:
— Experience troubleshooting and improving JVM performance
— Experience with Google Cloud Platform
— Knowledge of distributed NoSQL databases or key-value stores
— Strong Linux administration fundamentals
Work Location & Travel Requirements:
— Remote work allowed, specifically candidates must live in France or the United Kingdom and have the existing right to work there
— Up to 10% travel may be required based on business needs or manager requests
Compensation:
— Starting pay varies based on skills, experience, market demands, and location
— All offers include stock options
Benefits & Perks:
— Medical insurance options for employees and dependents
— Flexible time off, paid holidays, parental leave, and volunteer time off
— Employer-subsidized mental health and wellness programs
— Digital-first work environment with monthly stipend for remote work
— Mentorship and growth opportunities
AI in Recruiting:
— AI tools are used as decision-support only
— Human review of AI-generated recommendations is conducted
— No applicant is rejected solely based on AI output
— Candidates may request human review or opt out of AI evaluation
Hiring Commitment:
— Airship is committed to diversity and equal employment opportunities
— Employment decisions are made irrespective of protected characteristics
— Fair Chance laws compliance for applicants with criminal histories
Candidates affirm the truthfulness of their application and understand that false information may lead to dismissal.
УдалённоФранция, Великобритания; Airship believes that flexible work contributes to a more productive and more equitable work environment, and that Airshippers are able to collaborate, innovate, and support one another across different locations and timezones; Candidates must live in France or the United Kingdom and have the existing right to work in that country.This role may require up to 10% travel based on business needs or as requested by your manager
