Senior Java Engineer – AI-Driven Payments Platform (Remote)

emerchantpay Ltd; United States; Remote; USD 140,000 - 210,000; Full time

Benefits offered by this job

Fully distributed remote work

Professional development

Team events & growth

25 days paid holiday

Job summary

emerchantpay Ltd seeks an experienced Java developer to design and scale payment services. You will use AI coding assistants daily, implement complex APIs, and ensure high availability and secure processing in a PCI DSS environment.

Required 9–10+ years in core Java/J2EE, Hibernate, and database experience with MySQL or PostgreSQL. Remote, full-time, with modern tooling and DevOps practices.

Qualifications

• 9-10+ years of core Java / J2EE experience.
• Strong knowledge of ORM (Hibernate).
• Experience with MySQL and/or PostgreSQL databases.
• Frontend basics in JavaScript.
• Proficient in TDD/BDD with JUnit.
• Hands-on with AI coding assistants and agent tools.
• Understanding MCP and related tool integrations in Java.
• Experience building APIs with modern standards.
• Experience with SPA front-end apps.
• Security knowledge including OpenSSL and PCI DSS.

Responsibilities

• Designing and implementing complex workflows, APIs, and UI backends for payment platforms.
• Performing TDD with tools like JUnit.
• Help scale highly available payment services (99.99%+ uptime).
• Use AI coding assistants for implementation, refactoring, tests, and reviews.
• Contribute to AI tooling, prompts, and MCP server configurations for consistency.
• Apply secure AI practices in PCI DSS environments.

Skills

Java

J2EE/Spring

Hibernate ORM

MySQL/PostgreSQL

JavaScript

TDD/JUnit

AI coding assistants

MCP integration

API design

SPA front-end

Security (PCI DSS)

Linux / AWS / DevOps

Terraform / Ansible

Tools

Hibernate

MySQL

PostgreSQL

Spring AI

AWS

Ansible

Terraform

MCP server

Job description

emerchantpay Ltd seeks an experienced Java developer to design and scale payment services. You will use AI coding assistants daily, implement complex APIs, and ensure high availability and secure processing in a PCI DSS environment.

Required 9–10+ years in core Java/J2EE, Hibernate, and database experience with MySQL or PostgreSQL. Remote, full-time, with modern tooling and DevOps practices.