Sr. Fullstack Developer (Javascript/Java)

Argentina·Buenos AiresRemoteContract | Remotesenior

EngineeringFullstack Developer

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Quick Summary

Overview

Coderio designs and delivers scalable digital solutions for global businesses. With a strong technical foundation and a product mindset,

Technical Tools

EngineeringFullstack Developer

Coderio designs and delivers scalable digital solutions for global businesses. With a strong technical foundation and a product mindset, our teams lead complex software projects from architecture to execution. We value autonomy, clear communication, and technical excellence. We work closely with international teams and partners, building technology that makes a difference.

Learn more: http://coderio.com

In this role, you'll lead the end-to-end development of high-impact fintech platforms by designing, coding, and deploying scalable web applications. You'll collaborate with cross-regional teams, design robust microservices, and optimize performance for massive international traffic—all while delivering scalable, high-quality solutions that drive measurable business results.

Responsibilities

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• Design, code, and deploy high-volume, low-latency web applications, ensuring consistency across backend and frontend logic.

• Design and consume robust REST APIs to integrate securely with acquirers, local banks, and Alternative Payment Methods (APMs).

• Monitor and tune backend and database performance to support massive international financial traffic spikes without service degradation.

• Write clean, maintainable, and highly testable code (Unit/Integration Testing), integrating it seamlessly into automated CI/CD pipelines.

• Collaborate with technical teams to adopt AI tools and coding copilots into the daily development workflow to optimize delivery times.

Requirements

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• Advanced English (written and spoken) is a strict must-have requirement for daily remote collaboration with global teams.

• Solid, proven experience using Java (Spring / Spring Boot) as the primary language for the core financial ecosystem.

• Advanced proficiency in React, JavaScript, TypeScript, and modern frameworks.

• Experience with high-performance relational databases such as MySQL or PostgreSQL, including complex query optimization.

• Hands-on experience working with AWS (Amazon Web Services) and container ecosystems (Docker / Kubernetes).

• Strong soft skills: "Own it" mindset (accountability), flexibility to pivot in a dynamic fintech environment, and clear technical communication.

Nice to Have

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• Complementary experience with Node.js or Golang.

• Knowledge of NoSQL databases, specifically DynamoDB.

• Background in payments or financial systems.

What We Offer

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• 100% remote

• Long-term commitment, with autonomy and impact

• Strategic and high-visibility role in a modern engineering culture

• Collaborative international team and strong technical leadership

• Clear path to growth and leadership within Coderio

At Coderio, we value talent regardless of location. We are a remote-first company, passionate about technology, collaborative work, and fair compensation. We offer an inclusive, challenging environment with real opportunities for growth. If you are motivated to build solutions with impact, we are waiting for you.

Apply now.