Senior Java Full Stack Developer

Accord Technologies Inc; O'Fallon (IL); Hybrid; USD 120,000 - 160,000; Full time

Job summary

Accord Technologies Inc in Missouri is seeking a Senior Java Full Stack Developer to design and build a next-generation payment decision platform. This hands-on role requires writing code daily, prototyping, and leveraging AI coding tools to accelerate delivery with high quality.

You will work with senior engineers, architects, and product managers to deliver fast, reliable, and cost-efficient software that scales to billions of transactions, in a hybrid office setup near O'Fallon.

Qualifications

• Bachelor's degree in information systems, Information Technology, Computer Science, Engineering, or equivalent work experience.
• 7+ years of industry experience.
• Excellent communication across organizational levels and with customers.
• Proficient with Java/J2EE stack and databases (Oracle/SQL Server).
• Experience with SQL and NoSQL databases (MySQL/PostgreSQL/MongoDB).
• Experience with SOAP/REST, WebSphere/JBoss/Tomcat, HTML/JS, React/Angular, and IDEs.
• Experience with Maven, Gradle, Jenkins, Chef, Sonar; Waterfall/Agile.
• Experience with GenAI integration and AI-assisted coding.

Responsibilities

• Develop enterprise apps using Java stack with Angular/React front-end.
• Gather and refine business requirements.
• Align designs with Client Enterprise Architecture and services.
• Ensure development meets business needs.
• Document projects per standards.
• Aim for zero downtime in production.
• Collaborate with partners on roadmaps and direction.
• Address operational concerns for future programs and enhancements.
• Support PCI, GLBA, Safe Harbor compliance.
• Provide guidance on performance and architecture.
• Improve platform resilience, security, and scalability.
• Use AI tools daily in development (Claude Code, Copilot).

Skills

Java stack proficiency

Communication skills

Analytical thinking

Self-motivation

Interpersonal skills

J2EE & Java 8+

Spring & Hibernate

SQL & NoSQL databases

Education

Bachelor's degree in IT/CS/Engineering

Tools

Maven

Gradle

Jenkins

Chef

Sonar

WebSphere

JBoss

Tomcat

VS

Eclipse

Job description

Job Title: Senior Java Full Stack Developer

Location: O Fallon, MO

Type: W2 Contract (NO OPTs)

***Only qualified Senior Java Full Stack Developer located near O Fallon MO to be considered due to the position requiring a hybrid presence. ***

Industry: Payments LOCAL CANDIDATES PREFERRED!

Education

Bachelor s degree in information systems, Information Technology, Computer Science, Engineering, or equivalent work experience.

Required Skills & Experience

• More than 7 years of industry experience.
• Excellent communication skills, with the ability to interact across multiple organizational levels and with internal and external customer groups.
• Strong analytical and problem-solving abilities, with the ability to quickly adapt to new technologies, methodologies, and systems.
• High energy, strong attention to detail, and the ability to function independently under pressure with a high degree of initiative and self-motivation.
• Strong interpersonal and relationship-building skills, with a solid track record of developing internal and external partnerships.
• Proficiency with J2EE, Java 8 or higher, JSP, Servlets, Spring 5, Hibernate, and databases such as Oracle and SQL Server.
• Experience with SQL and NoSQL databases such as MySQL, PostgreSQL, and MongoDB.
• Experience with web services (SOAP/RESTful), servers (WebSphere, JBoss, Tomcat), HTML, JavaScript, jQuery, React or Angular, and IDEs such as Microsoft Visual Studio or Eclipse is a plus.
• Experience with tools such as Maven, Gradle, Jenkins, Chef, and Sonar, as well as methodologies such as Waterfall and Agile.
• Experience with LLM integration, prompt engineering, and agentic patterns.

Java Full Stack Engineering

• Java 8+, J2EE, Spring, Hibernate
• Angular/React front-end development
• REST/SOAP APIs and enterprise application development

Cloud-Native Architecture & DevOps

• Cloud-Native / AWS or Other Cloud Platforms
• CI/CD and engineering tools like Jenkins, Maven, Gradle, Chef, and Sonar

GenAI / AI-Enabled Engineering

• Ability to leverage GenAI tools to improve developer productivity
• Apply AI-assisted coding, testing, documentation, and troubleshooting
• Explore practical GenAI use cases for modernization, automation, and platform efficiency

Role

You will design and build the next-generation Decision Management Platform, the real-time system that scores and approves billions of payment transactions. This is a hands-on role where you will write code, run prototypes, and use AI coding tools every day to ship faster and at higher quality. You will be joining a high-growth team that is actively expanding to meet increasing scale and impact. You will work directly with senior engineers, architects, and product managers to deliver features that make the platform faster, more reliable, and more cost-efficient to run.

Responsibilities

• Develop enterprise applications using a Java technology stack with Angular or React as front-end technologies.
• Participate in gathering and refining business requirements.
• Ensure software designs align with Client Enterprise Architecture and leverage enterprise services.
• Ensure product development meets Client business needs.
• Apply Client standard development methodologies, follow technology standards, and ensure projects are appropriately documented.
• Ensure software and system design support the goal of zero downtime in production.
• Work closely with business partners on product definition, roadmaps, business case development, and overall team direction.
• Respond to operational and business concerns related to future programs, projects, or enhancements to ensure consistent delivery of quality services.
• Support appropriate certifications and compliance requirements, including PCI, GLBA, Safe Harbor, and others.
• Drive performance engineering of the enterprise software architecture and provide guidance, advice, or training to other application developers.
• Improve and expand the existing platform by ensuring it is resilient, secure, and scalable.
• Use AI tools effectively as part of daily development work, including tools such as Claude Code, Copilot, or similar platforms.