Senior Software Engineer (IRL/UK)
Circle is a cutting-edge financial technology company spearheading innovation in the realm of digital monetary transactions. Our forward-thinking technology facilitates the seamless transfer of value across borders in a swift and cost-effective manner. This revolutionary development in the world of finance opens up new realms of possibility for global economic growth and increased accessibility. Through our infrastructure and groundbreaking projects like USDC, we empower businesses, institutions, and developers to capitalize on this transformative shift in the intersection of money and technology.
Company Culture:
At Circle, we prioritize transparency and reliability in all our endeavors. As we expand our presence across diverse geographic regions, we uphold values centered on speed, efficiency, and excellence. Our team embodies key values such as Multistakeholder approach, Mindfulness, Drive for Excellence, and High Integrity. In a remote work environment, our employees are dedicated to continuous growth and collaborative success. By fostering a flexible and inclusive workplace, we encourage innovative thinking and ensure every individual feels a sense of ownership and contribution.
Key Responsibilities:
The Senior Software Engineer plays a crucial role in enhancing Circle's in-house blockchain ecosystem to support widespread digital tokenization. Duties include analyzing, optimizing, and extending existing systems, developing scalable microservices to facilitate secure API interactions across various blockchain and traditional banking protocols, partnering with cross-functional teams to shape features, and ensuring system reliability. Other responsibilities involve troubleshooting system issues, creating developer-friendly APIs for payment system integration, and collaborating with industry-leading organizations for seamless service delivery.
Job Requirements:
To thrive in this role, candidates must possess a minimum of 4 years of professional experience in software development using object-oriented languages, preferably Java. A degree in Computer Science or equivalent field, experience in team leadership, proficiency in payment system operations, RESTful API design understanding, familiarity with Cloud Services, and skill in SQL database development are essential. Additionally, strong focus on coding standards, an inclination towards continuous improvement, effective communication, and the ability to work autonomously in a dynamic environment are required attributes for success.
We are committed to fostering a diverse and inclusive work environment and do not discriminate based on factors like race, religion, gender, or age. Join us at Circle as we embark on an exciting journey towards transforming the global financial landscape.
Ассистент по проектам веб-разработки и веб-дизайна
Мы ищем опытного менеджера проектов для управления проектами по веб-разработке и дизайну в сфере криптовалют.
Вы будете отвечать за полную реализацию проектов — от начала до сдачи, управляя собственной командой или координируя работу фрилансеров.
Обязанности:
Управление полным жизненным циклом проекта (планирование → сдача)
Координация разработчиков, дизайнеров и фрилансеров
Определение сроков, этапов и результатов
Обеспечение качества и своевременной сдачи проектов
Прямое взаимодействие с заказчиками
Требования:
Подтверждённый опыт управления веб-проектами
Умение работать самостоятельно или руководить командой
Опыт работы с фрилансерами
Сильные организационные и коммуникативные навыки
Базовое понимание криптовалют / Web3
Оплата:
От $3000 в месяц
Выплаты в криптовалюте (по желанию)
Долгосрочное сотрудничество
Мы предлагаем:
Полностью удалённую работу
Постоянный поток проектов
Возможность роста в сфере криптовалют
Важно:
Мы ищем человека, способного качественно и в срок реализовывать проекты «под ключ».
Assistant for web development and web design projects
We are looking for an experienced Project Manager to manage web development and design
projects in the crypto space.
You will be responsible for delivering projects end-to-end, either by managing your own team or
coordinating freelance professionals.
Responsibilities:
- Manage full project lifecycle (planning → delivery)
- Coordinate developers, designers, and freelancers
- Define timelines, milestones, and deliverables
- Ensure quality and on-time delivery
- Communicate directly with stakeholders
Requirements:
- Proven experience in web project management
- Ability to work independently or lead a team
- Experience working with freelancers
- Strong organizational and communication skills
- Basic understanding of crypto / Web3
Compensation:
- Starting from $3000/month
- Paid in crypto (optional)
- Long-term collaboration opportunity
What we offer:
- Fully remote position
- Continuous flow of projects
- Opportunity to grow within the crypto space
Important:
We are looking for someone who can deliver complete turnkey projects with high quality and within
deadlines.
Startup
Senior Software Engineer (Blockchain)
MentTech is a forward-thinking technology company dedicated to transforming how mentoring and learning are delivered in the digital age. By combining advanced tools, intelligent systems, and a human-first approach, MentTech helps individuals, teams, and organizations harness the power of mentorship to unlock potential, build skills, and achieve lasting growth.
The Role
We are seeking a Smart Contract Developer responsible for ensuring that game listings within MentTech work properly and ensuring compliance with all game store policies.
Key Responsibilities:
• Architect, implement, and deploy secure smart contracts for an on-chain Play-to-Earn GameFi ecosystem
• Lead contract design decisions with a focus on robustness, auditability, gas efficiency, and resilience to attack vectors
• Mentor/junior developers: perform code reviews, establish standards, best practices in security & testing
• Collaborate cross-functionally with game designers, backend, QA, and security teams to align smart contract features with product roadmap
Qualifications:
• 2+ years hands‐on experience developing & deploying smart contracts (Solidity / EVM or equivalent) in production environments
• Track record of writing secure contracts, familiarity with common vulnerabilities (reentrancy, integer over/underflow, front-running, flash loans, etc.)
• Experience with audits, formal verification, fuzz testing, or other advanced contract assurance methods
• Strong test suite / CI workflow skills; comfortable using tools like Hardhat, Foundry, Truffle etc.
• Solid understanding of GameFi mechanics and how on-chain economics work
Bonus Points:
• Experience on multiple EVM chains or Layer-2 / sidechains
• Knowledge of cross-chain bridges, oracles, NFTs, tokenomics design
• Contributions to open-source security tooling or prior audit reports or published code you’re proud of
Why join MentTech?
At MentTech, we cultivate a culture of flexibility, autonomy, and the freedom to make a real impact on the broader Web3 ecosystem. Experience the advantages of a fully remote working environment where your expertise and contributions are rewarded with competitive compensation tailored to your role and project influence.
Ment Tech Labs
• Employee Equity & Incentives: Unlock future growth with equity and other potential incentives.
• Entrepreneurial Culture: Join a collaborative environment where we innovate together as partners.
• Cutting-edge Innovation: Work at the forefront of gaming and blockchain.
• Key Strategic Projects: Be part of transformative initiatives that are redefining the gaming landscape.
• Remote Flexibility: Enjoy a truly flexible, fully remote work setup that supports your lifestyle.
• Talented Team: Collaborate with a team of passionate, driven, and skilled professionals.
• Community Impact: Contribute to the growth and success of the Web3 and gaming communities.
• Flexible Payment Options: Receive payments in crypto or fiat, tailored to your preference.
• Growth Opportunities: Access valuable learning experiences and development paths.
MentTech Labs, Inc. is an equal opportunities workplace that doesn’t discriminate based on race, ethnicity, gender, ancestry, national origin, religion, sex, sexual orientation, gender identity, age disability, veteran status, genetic information, marital status, or any other legally protected status.
Junior / Middle Metaverse Developer (Unity / Web3 / VR)
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.