Вакансии

Design and implement extensions to EVM clients (Geth/Reth) for supporting stateful precompiles. Implement novel mechanism design primitives, collaborating with our research team, into the execution layer.

Чем предстоит заниматься: проектировать новые сервисы и прорабатывать технические решения «с нуля»; писать лаконичные SQL-запросы (ORM — не наш путь) и выжимать максимум из PostgreSQL, ClickHouse, ElasticSearch;

• Интеграция с ML-модулями и другими сервисами через REST/gRPC; • Участие в проектировании архитектуры и API;

-Лидировать разработку продуктов и сервисов цифровой экосистемы. -Формировать и развивать архитектуру экосистемы.

Scala Engineer is responsible for building and optimizing high-performance backend systems that power the data-driven applications. In this role, you will work with modern streaming technologies, distributed processing frameworks, and cloud-native architectures to deliver scalable, reliable, and high-availability solutions.

Опыт коммерческой разработки: от 3–5 лет в backend или системном программировании, из которых от 2 лет — активная коммерческая разработка на Rust. Асинхронное и многопоточное программирование: уверенное владение async/await, опыт работы с многопоточностью (concurrency) и асинхронными средами выполнения (фреймворк Tokio, библиотеки async-std, crossbeam).

What you will do Develop and maintain market data components and connectivity to cryptocurrency exchanges. Develop and maintain trading algorithms and add features to the trading system.

Location: Poland; Spain; Slovakia; Czechia; Bulgaria; Moldova We are looking for a strong Python Developer to join our GameServer team. You will work on a high-load gaming platform that processes gaming traffic and handles numerous API integrations with external operators. Your focus will be on developing and maintaining scalable backend services, improving system performance and reliability, and contributing to technical and architectural improvements. We’re looking for a proactive engineer who takes ownership of their work, enjoys solving complex technical challenges, and is eager to contribute ideas that make our product better. Requirements 4+ years of commercial experience with Python ; Strong understanding of algorithms and data structures; Solid experience with relational databases (PostgreSQL or similar); Experience designing scalable backend systems ; Good written English (for documentation and communication); Languages: English (B2), Ukrainian (Proficient) . Would be plus Experience with non-relational databases (Cassandra, Redis/KeyDB, etc.); Hands-on experience with Docker and Kubernetes; Experience working with high-load or distributed systems; Production experience with monitoring, error tracking and observability tools; Experience designing and developing integrations with third-party services and APIs; Experience using AI tools to support software development workflows. Responsibilities Develop and maintain high-load backend services; Improve system performance, scalability, and reliability; Design fault-tolerant systems; Take part in architectural decisions and technical discussions; Optimize and evolve existing systems and tools; Participate in code reviews and engineering best practices; Collaborate closely with the team to define priorities and solutions; Write clear technical documentation. Technology Stack Python (FastAPI, Flask, Celery) JavaScript/TypeScript PostgreSQL, Cassandra, KeyDB Git, CI/CD (Jenkins) Docker Kubernetes/Helm Benefits 🎰 Be part of the international iGaming industry – Work with a top European solution provider and shape the future of online gaming; 💕 A Collaborative Culture – Join a supportive and understanding team; 💰 Competitive salary and bonus system – Enjoy additional rewards on top of your base salary; 📆 Unlimited vacation & sick leave – Because we prioritize your well-being; 📈 Professional Development – Access a dedicated budget for self-development and learning; 🏥 Healthcare coverage – Available for employees in Ukraine and compensation across the EU; 🫂 Mental health support – Free consultations with a corporate psychologist; 🇬🇧 Language learning support – We cover the cost of foreign language courses; 🎁 Celebrating Your Milestones – Special gifts for life’s important moments; ⏳ Flexible working hours – Start your day anytime between 9:00-11:00 AM; 🏢 Flexible Work Arrangements – Choose between remote, office, or hybrid work; 🖥 Modern Tech Setup – Get the tools you need to perform at your best; 🚚 Supported Relocation Opportunities – Explore opportunities to relocate to one of our company hubs with financial assistance.

Location: Bengaluru, India We are looking for a Senior Backend Developer to design and develop enterprise grade backend solutions using C# and .NET. You will contribute to scalable microservices, distributed systems, cloud native services, and cross functional engineering collaboration. This project is centered on developing resilient backend services for a distributed platform with microservices, REST integrations, and event driven architecture. It supports scalable enterprise solutions across multiple functional domains and cloud environments. Design and develop enterprise grade backend services using C# and .NET, .NET Core Design and implement scalable microservices within service oriented platforms Develop services supporting multi source data aggregation, policy and rules enforcement, and extensible functional domains Apply microservice architecture principles including API First Design, Domain Driven Design, and bounded contexts Design and implement synchronous REST based integrations with internal and external systems Develop and support asynchronous and event driven integration patterns Design efficient data models using relational SQL and NoSQL databases Optimize database performance and manage data consistency across distributed systems Build resilient, scalable, and maintainable cloud native solutions using Microsoft Azure Implement appropriate resiliency, fault tolerance, configuration management, and distributed system patterns Collaborate with Architects, Product Managers, Business Analysts, QA Engineers, and other Developers throughout the delivery lifecycle Contribute to technical design discussions, architecture decisions, code reviews, and engineering standards Develop and maintain unit tests to ensure code quality, reliability, and maintainability Troubleshoot complex application, integration, performance, and production issues Work effectively with globally distributed teams and participate in coordinated meetings across time zones when required 10+ years of backend software development experience with strong hands on expertise in C# and .NET, .NET Core Strong experience designing and developing enterprise grade microservices Strong understanding of microservice architecture patterns including API First Design, Domain Driven Design, and bounded contexts Experience designing and consuming REST APIs and implementing synchronous system integrations Experience working with asynchronous and event driven architectures Strong hands on experience with relational SQL databases and NoSQL databases Experience with data modelling, database performance optimization, and data consistency within distributed systems Hands on experience with Microsoft Azure and Azure native services Strong understanding of cloud configuration management, resiliency patterns, scalability, and distributed system design Experience designing maintainable, highly available, and scalable backend solutions Strong understanding of software engineering principles, coding standards, and unit testing Ability to analyze complex technical requirements and translate them into effective backend solutions Strong problem solving and troubleshooting skills Ability to communicate clearly in English and collaborate effectively with technical and non technical stakeholders Experience working with geographically distributed development teams Experience in the travel technology domain Knowledge of Global Distribution Systems Experience integrating with GDS platforms or travel suppliers Exposure to booking platforms, travel APIs, reservation systems, or travel content aggregation Understanding of the broader travel ecosystem and supplier integration landscape Experience working on large scale enterprise or distributed platforms Experience with multi source data aggregation and policy or rules based processing Experience supporting cloud native transformation or modernization programs

Декомпозировать существенные доработки системы на подзадачи; Реализовывать новый функционал в рамках сформулированных задач, требований и принятых в команде стандартов;

Для данной позиции подходят следующие локации: Польша, Грузия, Казахстан, Кыргызстан, Узбекистан, Армения, Сербия, Черногория, Турция. Кандидат должен быть доступен для работы в стандартные рабочие часы клиента — с 9:00 до 17:00 по времени штата Аризона, а также придерживаться рабочего календаря США (с учетом американских праздничных дней). В Беларуси позиция открывается через VPN. Контакт для отклика: kvishnevskaya@aristeksystems.com.

-Лидировать разработку продуктов и сервисов цифровой экосистемы. -Формировать и развивать архитектуру экосистемы.

Location: Warsaw, Poland; Poland On behalf of FinTech Client #4 , SD Solutions is looking for a talented Senior Java Developer SD Solutions is a staffing company operating globally. Contact us to get more details about the benefits we offer. Responsibilities: Work as a Senior Java Engineer for an online card payment system that processes millions of transactions a day for 1000+ merchants in 160 currencies, with 99,995% uptime Work with technologies such as: Java, Kotlin, Spring, Hibernate, SQL, Selenium, Gradle, AWS Building new features and automated tests with the highest attention to code quality and Continuous Delivery rules Finding and improving solutions for both technical and business issues Working with highly skilled specialists with the most efficient technologies and tools Requirements: At least 5 years of hands-on Java development experience - not only coding but also problem-solving with a medium to high level of autonomy in projects High level of expertise in Java and a solid knowledge of the listed technologies/tools Academic degree in IT/programming field Proven track record of delivering high-quality code with attention to scalability and reliability . Strong analytical skills and a predisposition for innovative thinking Decision-making approach and a goal-oriented attitude Fluency in English An open-minded and easygoing personality is a must - we like to like each other! Advantages: Technologies: JavaScript (ES7+), React Experience in Datadog, OpenSearch, Sentry Experience in the payments/fintech industry Product-based IT company experience Fluency in Polish About the company: A global fintech company providing unified payment infrastructure and financial services for merchants and consumers worldwide. The platform integrates multiple payment channels into a single solution, combining in-house technology development and product innovation to streamline transactions at scale. By applying for this position, you agree to the terms outlined in our Privacy Policy. Please take a moment to review our Privacy Policy https://sd-solutions.breezy.hr/privacy-notice , and make sure you understand its contents. If you have any questions or concerns regarding our Privacy Policy, please feel free to contact us.

Ищем .NET-разработчика в Scrum-команду, которая развивает современные desktop-продукты.

Задачи: — Разрабатывать web-приложения на PHP и JavaScript — Поддерживать, дорабатывать и исправлять существующие web-приложения — Аккуратно развивать работающие решения и участвовать в принятии технических решений — Взаимодействовать с коллегами и заказчиком Требования: — Коммерческий опыт разработки на PHP и Laravel — Опыт работы с JavaScript, React и jQuery — Опыт работы с Git, Docker и Linux — Понимание базовых CI/CD-процессов — Опыт работы с MySQL и Redis — Умение разбираться в коде и аккуратно развивать уже работающие решения — Разговорный английский для периодических созвонов с заказчиком и участия в рабочих обсуждениях — Готовность к полностью удалённому формату и постоянному присутствию в Discord в течение рабочего дня Условия: — Полностью удаленная работа из любой точки мира — Возможна релокация в Черногорию — График: понедельник–пятница, 10:00–19:00 МСК — 28 календарных дней оплачиваемого отпуска — Квартальные бонусы по результатам работы — Корпоративный социальный пакет: страхование жизни, выплаты при важных жизненных событиях и дополнительная финансовая помощь в сложных ситуациях — Помощь коллег, обмен опытом, участие в технических решениях, геймифицированная мотивация и дружелюбная коммуникация

Location: Remote USA Workplace: remote ABOUT YOU   We are looking for a Software Engineer, Web3 for Xsolla ZK, Xsolla's Web3 ecosystem on a zkSync-based L2. This will involve working on: 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.   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. Responsibilities: 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 Qualifications & Skills: 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. The team. You will work alongside product managers, designers, smart contract, backend and frontend engineers, QA and DevOps. How We Hire: Intro call. Your background, your motivation and the role. Technical interview. Built directly on the Responsibilities and Qualifications & Skills 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. 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 100% company-paid medical, dental, and vision plans, unlimited Flexible Time Off, 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 the Software Engineer, Web3 position, we will conduct a background check that may include the following: 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: Accessing confidential company data 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.

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.

- Опыт коммерческой разработки на Java от 4 лет. - Опыт в Enterprise-среде (банки, финтех, телеком) — обязательно❗️.