Senior Fullstack Software Engineer (100% Remote)

tether; A distancia; EUR 65.000 - 85.000; Jornada completa

Descripción de la vacante

A leading fintech company in Barcelona is seeking a Senior Fullstack Software Engineer to enhance its cloud services platform. This role demands substantial experience in backend development, particularly with Node.js and JavaScript, while driving innovation in decentralized AI infrastructure. Candidates should possess expertise in distributed systems, coupled with skills in React for frontend development. Embrace this opportunity to contribute meaningfully within a dynamic and remote team environment.

Servicios

Competitive salary

Remote work flexibility

Collaborative work environment

Formación

• 5+ years of experience in fullstack development with strong emphasis on backend systems.
• Expert‑level proficiency in Node.js/JavaScript for backend development and React frontend framework.
• Proven experience building and scaling distributed systems or event‑driven architectures.

Responsabilidades

• Design and implement robust backend services and APIs for AI model inference.
• Build responsive web interfaces for training job management and model deployment.
• Contribute to the design of distributed systems using peer-to-peer technologies.

Conocimientos

Node.js

JavaScript

React

API design

Docker

Kubernetes

Networking

Security principles

Real-time data streaming

Distributed systems

Descripción del empleo

Join Tether and Shape the Future of Digital Finance

At Tether, we’re not just building products, we’re pioneering a global financial revolution. Our cutting‑edge solutions empower businesses—from exchanges and wallets to payment processors and ATMs—to seamlessly integrate reserve‑backed tokens across blockchains. By harnessing the power of blockchain technology, Tether enables you to store, send, and receive digital tokens instantly, securely, and globally, all at a fraction of the cost. Transparency is the bedrock of everything we do, ensuring trust in every transaction.

Innovate with Tether

Tether Finance

Our innovative product suite features the world’s most trusted stablecoin, USDT, relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services.

Tether Power

Driving sustainable growth, our energy solutions optimize excess power for Bitcoin mining using eco‑friendly practices in state‑of‑the‑art, geo‑diverse facilities.

Tether Data

Fueling breakthroughs in AI and peer‑to‑peer technology, we reduce infrastructure costs and enhance global communications with cutting‑edge solutions like KEET, our flagship app that redefines secure and private data sharing.

Tether Education

Democratizing access to top‑tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity.

Tether Evolution

At the intersection of technology and human potential, we are pushing the boundaries of what is possible, crafting a future where innovation and human capabilities merge in powerful, unprecedented ways.

Why Join Us?

Our team is a global talent powerhouse, working remotely from every corner of the world. If you’re passionate about making a mark in the fintech space, this is your opportunity to collaborate with some of the brightest minds, pushing boundaries and setting new standards. We’ve grown fast, stayed lean, and secured our place as a leader in the industry.

If you have excellent English communication skills and are ready to contribute to the most innovative platform on the planet, Tether is the place for you.

Are you ready to be part of the future?

About the job

As a Senior Fullstack Software Engineer on the CosmicAC team, you will play a critical role in building and scaling our GPU‑accelerated cloud services platform. You'll work on both the backend infrastructure that powers AI/ML workloads at scale and the frontend interfaces that make these capabilities accessible to developers and data scientists. This position requires deep technical expertise in distributed systems, strong backend development skills, and the ability to create intuitive user experiences.

You’ll be joining a team that’s pushing the boundaries of decentralized AI infrastructure, working on everything from Kubernetes orchestration and managed inference services to API design and real‑time monitoring dashboards. Your work will directly impact how developers interact with and deploy AI models in production environments.

Responsibilities

• Backend Development: Design and implement robust backend services and APIs that handle AI model inference, resource orchestration, and workload distribution across distributed GPU infrastructure
• Frontend Implementation: Build responsive and intuitive web interfaces for training job management, model deployment workflows, and real‑time monitoring dashboards using modern JavaScript frameworks
• Distributed Systems Architecture: Contribute to the design and implementation of distributed systems using peer‑to‑peer technologies (Holepunch stack)
• API Design & Integration: Develop and maintain APIs that support both synchronous and asynchronous inference patterns, ensuring compatibility with industry standards
• Platform Reliability: Implement monitoring, logging, and telemetry solutions to ensure high availability and performance of the platform services
• Cross‑functional Collaboration: Work closely with DevOps, AI/ML engineers, and product teams to deliver integrated solutions that meet technical and business requirements
• Code Quality & Best Practices: Maintain high standards for code quality through peer reviews, testing, and documentation while championing security best practices

Qualifications

• 5+ years of experience in fullstack development with strong emphasis on backend systems
• Expert‑level proficiency in Node.js/JavaScript for backend development and React frontend framework
• Proven experience building and scaling distributed systems or event‑driven architectures
• Strong understanding of API design and implementation, including authentication, rate limiting, and versioning
• Experience with containerization technologies (Docker) and orchestration platforms (Kubernetes)
• Proficiency with databases, and a deep understanding of data modeling and optimization
• Solid understanding of networking, security principles, and best practices for production systems
• Experience with real‑time data streaming and RPC implementations
• Ability to work independently in a remote environment and communicate effectively across time zones

Preferred

• Experience with peer‑to‑peer technologies (Hyperswarm, libp2p, WebRTC) or similar distributed communication protocols
• Familiarity with AI/ML inference APIs and OpenAI‑compatible endpoints
• Previous experience building AI SaaS or PaaS platforms
• Knowledge of GPU resource management and ML framework infrastructure
• Experience with message queuing systems (Redis, RabbitMQ, Kafka)
• Familiarity with observability tools (Prometheus, Grafana, ELK stack)
• Understanding of WebAssembly or edge computing paradigms
• Contributions to open‑source projects in relevant domains

Important information for candidates

Recruitment scams have become increasingly common. To protect yourself, please keep the following in mind when applying for roles:

• Apply only through our official channels. We do not use third‑party platforms or agencies for recruitment unless clearly stated. All open roles are listed on our official careers page:https://tether.recruitee.com/

• Verify the recruiter’s identity. All our recruiters have verified LinkedIn profiles. If you’re unsure, you can confirm their identity by checking their profile or contacting us through our website.

• Be cautious of unusual communication methods. We do not conduct interviews over WhatsApp, Telegram, or SMS. All communication is done through official company emails and platforms.

• Double‑check email addresses. All communication from us will come from emails ending in @tether.to [e-mail]

• We will never request payment or financial details. If someone asks for personal financial information or payment at any point during the hiring process, it is a scam. Please report it immediately.

When in doubt, feel free to reach out through our official website.