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Bitfinex is a digital asset trading platform offering state-of-the-art services for digital currency traders and global liquidity providers. Founded in 2012, Bitfinex was one of the first professional platforms set up to accommodate for the booming interest in cryptocurrency trading. Since then, our team has gained invaluable experience whilst cementing our spot as the go-to platform for digital asset traders and institutions. Our Mission Our aim is to create a free and accessible global digital economy by disrupting the current financial services industry. Our team is entirely remote, composed of individuals with an ownership mentality; no one waits to be told what to do. Each member of the team is a highly motivated self-starter that is comfortable with autonomy and believes in lifelong learning. When we’re not working, we’re dreaming about it. We place our egos aside and thrive within a culture that fosters one another from the birth of a concept to launch of a product. At Bitfinex you have the freedom to work as you please - all that matters is execution. Join us and help lay the foundation for a decentralized future. Currently looking for: Senior Backend Developer [Remote] Key responsibilities As a senior Backend Developer, you will be a part of the team that works on the development of the backend components of all Bitfinex Services (main trading application, Bitfinex Pay, Lightning Network support, Blockchain integrations, ….). This includes: New Products and Features - Bitfinex continuously strives to create innovative new features in order to provide the most professional trading experience for customers. These are developed and deployed using agile methodologies, to ensure the user experience remains the best in the industry. Scalability - all backend services that power Bitfinex platform must remain effortlessly smooth, responsive, and real-time for customers as the platform continues to scale to accommodate new user growth. A good example are the renown Bitfinex API, the most solid, low-latency and complete in our industry. Security - Bitfinex makes Security its most important feature. The Backend Development team is responsible for building all the API services and backend processes with the highest security principles and standard, in order to protect the safety of the entire user base. • 6+ Years of Node/JavaScript experience Familiar with microservices architecture Have actively participated in the development of a complex platform Good experience in interacting with databases (MySQL, MongoDB) Ability to quickly learn new technologies Good understanding of security practices Nice to have Experience with blockchain integration Comfortable with high-availability concepts Ruby, Rust or C++ skills are a plus Other technologies of interest: Message queues (Redis), Caches and Job Queues

About the company and the project: A leading U.S.-based edtech company is looking for a Middle Ruby on Rails Developer to join their fully remote team. Their platform helps educational institutions manage and distribute digital learning materials — from e-textbooks to interactive courseware. The company is known for its advanced e-reader, AI-powered study tools, and seamless integrations with major learning management systems. Their solutions are used by thousands of schools and universities, helping students save over $160 million on textbooks and other materials. The team has a strong engineering culture and very low turnover — many developers have been with the company for years. You’ll be joining a stable, collaborative, and impact-driven environment where your work will directly support modern education. Your tasks on the position: • Participation in all aspects of the application development life cycle, including specifications, prototypes, development, quality assurance, deployment and operations, • Development and modification of internal and external software as part of a team of engineers, • Checking work in practice and using automated tests, • Supporting the day-to-day work of the team, troubleshooting and resolving issues as they arise, • 3+ years of experience with Ruby on Rails, • 3+ years of application and API development experience, • Experience with MySQL or other relational databases, • Experience with Git or other source code control systems, • Working hours: 12:00–20:00 (GMT+2, Kyiv time), • B2B cooperation is mandatory, • Ukrainian/Russian C1+, • English B2+ Will be an advantage: • Knowledge of modern web development technologies: PHP, JavaScript, web services (REST), MySQL, • The company guarantees decent pay $3500-5500 gross, • 100% remote work format, • Stable work in an American company (the company has existed since the early 2000s), • Opportunity for self-development: various technologies and tools, corporate subscription to Udemy training platform, • Friendly and supportive team, • Paid holiday and sick leave

Tether, the founder of the first, largest, and most widely used stablecoin USD₮, is rapidly expanding into a wide range of sectors, including secure and unstoppable communication technologies, energy production, mining, and further fintech infrastructure. All of these themes share and are deeply rooted in the principles of Bitcoin, which include decentralization, resilience, openness, freedom, security, and scalability. Tether stablecoins are used to power a wide variety of enterprises, including exchanges, wallets, payment processors, and financial services, by facilitating the use of reserve-backed tokens across blockchain networks. Tether stablecoins offer a global, secure, and instant means of storing, transmitting, and receiving digital tokens at a fraction of the cost of alternative traditional financial solutions. Unwavering transparency is of paramount importance and central to Tether's foundational principles. Our dynamic team operates entirely remotely, uniting talent from every corner of the globe. Our journey has been marked by rapid growth and efficient operations, firmly establishing us as pioneers within the industry. If you possess a passion for venturing into uncharted territory and believe in your ability to conquer even the most formidable challenges, we eagerly invite you to engage with us. Join our mission, and together, let's lay the groundwork for a decentralized future that reshapes industries far beyond the realm of stablecoins. As a Senior Backend Developer, you will be a part of the team that works on the development of Tether backend components New Products and Features - Tether continuously strives to create innovative new features in order to provide the most professional trading experience for customers. These are developed and deployed using agile methodologies, to ensure the user experience remains the best in the industry. Scalability - all backend services that power Tether must remain effortlessly smooth, responsive, and real-time for customers as the platform continues to scale to accommodate new user growth. Security - Security is the most important feature. The Backend Development team is responsible for building all the services and core processes with the highest security principles and standard, in order to protect the safety of the entire user base. Exceptional Node/JavaScript skills Familiar with microservices architecture Have actively participated in the development of a complex platform Familiar with Peer-to-Peer technologies Good experience in interacting with databases (MySQL, MongoDB) Ability to quickly learn new technologies Good understanding of security practices Nice to have Experience with blockchain integration Comfortable with high-availability concepts Ruby, Rust or C++ skills are a plus Other technologies of interest: Message queues (Redis), Caches and Job Queues

Hiring: Senior Ruby on Rails Developer (Remote - UK Based).Anywhere in the UK (100% Remote).Full-Time | Flexible Hours | Work-Life Balance Champions.Ready to level up your dev career with a company that.Join a forward-thinking tech powerhouse where creativity meets cutting-edge code.You’ll be part

Senior Full Stack Ruby on Rails Developer (Remote - UK Based).Flexible | Friday afternoons for personal projects.I am hiring a Senior Full Stack Developer with strong Ruby on Rails experience to join a remote-first, innovation-driven tech company.You’ll work on impactful products using modern tech

Proficient with code review, quality analysis, and identifying/fixing code smells, anti-patterns, and test gaps in Ruby codebases. Experience generating and maintaining high-quality documentation for tests, bugs, and technical debt.

Proficient with code review, quality analysis, and identifying/fixing code smells, anti-patterns, and test gaps in Ruby codebases. Experience generating and maintaining high-quality documentation for tests, bugs, and technical debt.

A fast-growing US-based SaaS company is transforming how energy firms manage operations.Their end-to-end ERP platform streamlines field data, production, finance, land, and compliance, delivering real-time insights and operational efficiency.With a strong client base and innovative tech, they’re r

This opportunity is only for candidates currently residing in the specified country.Your location may affect eligibility and rates.Please submit your resume in English and indicate your level of English proficiency.We believe in using the power of collective intelligence to ethically shape the futur