Sr. Fullstack Developer (Javascript/Java)

Coderio; United States; Remote; USD 140,000 - 190,000; Full time

Benefits offered by this job

100% remote

Autonomy & impact

International team

Growth opportunities

Job summary

Coderio is seeking a senior software engineer to lead end-to-end fintech platform development. You will design, code, and deploy scalable web applications with a focus on performance and reliability, collaborating with global teams across regions.

You will work with Java/Spring Boot, React/TypeScript, and modern cloud-native stacks on high-traffic systems. Remote-first environment, strong communication, and autonomy are valued as you contribute to architectural decisions.

Qualifications

• Fluent written and spoken English required for daily remote collaboration with global teams.
• Proven experience with Java (Spring/Spring Boot) as the core language in fintech ecosystems.
• Strong React/JavaScript/TypeScript skills in modern web apps.
• Hands-on database experience with MySQL or PostgreSQL and advanced query optimization.
• Experience with AWS and container ecosystems (Docker/Kubernetes).
• Excellent communication, accountability, and ability to adapt in fintech environments.

Responsibilities

• Design, code, and deploy high-volume, low-latency web applications for fintech platforms.
• Design and consume REST APIs to integrate with payment processors, banks, and APMs.
• Monitor and optimize backend and database performance for massive international traffic.
• Write clean, well-tested code and integrate it into CI/CD pipelines.
• Collaborate with cross-regional teams to adopt AI tools and coding copilots to improve delivery times.

Skills

Advanced English

Java / Spring Boot

React / JavaScript / TypeScript

MySQL / PostgreSQL

AWS / Docker / Kubernetes

Strong communication

Tools

Docker

Kubernetes

AWS

CI/CD

Job description

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.

What to Expect in This Role (Responsibilities)

• 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

• 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

• Complementary experience with Node.js or Golang.
• Knowledge of NoSQL databases, specifically DynamoDB.
• Background in payments or financial systems.

Benefits

• 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

Why join 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.