Sr. Fullstack Developer (Javascript/Java) (Fully Remote)

Coderio; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Coderio is a remote-first company seeking a skilled backend engineer to design, code, and deploy high-volume, low-latency financial web applications using Java Spring Boot. You will build robust REST APIs, ensure secure integrations with acquirers and banks, and collaborate with international teams from a fully remote setup.

The role emphasizes long-term commitment, autonomy, and leadership potential within an expanding global engineering organization, with opportunities to guide architecture

Qualifications

• Proficient in Java (Spring/Spring Boot) for core financial systems.
• Advanced English for daily remote collaboration with global teams.
• Experience designing and consuming REST APIs for secure integrations.
• Ability to work autonomously in a 100% remote, long-term role and contribute to technical leadership.

Responsibilities

• Design, code, and deploy high-volume, low-latency web applications.
• Design and consume robust REST APIs to integrate with acquirers, local banks, and APMs.
• Monitor and tune backend and database performance to handle international traffic spikes.

Skills

Java (Spring Boot)

Advanced English

Remote collaboration

Technical leadership

Tools

REST APIs

Job description

• 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.

Requirements:

• Advanced English for daily remote collaboration with global teams.
• Solid experience using Java (Spring/Spring Boot) as the primary language for core financial ecosystems.
• 100% remote with long-term commitment and autonomy.
• Collaborative international team and strong technical leadership.
• Clear path to growth and leadership within Coderio.

Coderio

Coderio designs and delivers scalable digital solutions for global businesses. They are a remote-first company with a strong technical foundation, valuing autonomy and technical excellence.