Software Engineer (Java 17 development)

Ardent Principles, Inc.•Arlington, VA

11h•$130,000 - $260,000•Onsite

About The Position

We are seeking a Senior-Level Software Engineer with expert Core Java proficiency and deep command of enterprise-grade web, API, PKI, and Linux technologies. This role demands mastery of Java 17 or higher, Eclipse IDE, JVM/JRE/JDK internals, JSP, AJAX, jQuery, and front-end development, paired with extensive experience deploying and tuning applications on Apache Tomcat 11+ and configuring Tomcat connectors and HTTPD. Ardent Principles offers advanced services in data science, data engineering, software engineering, AI solutions, cybersecurity, staff augmentation, and IT program management. We provide more than a position—we offer a workplace committed to excellence, integrity, and mission-focused impact. Our mission is to act as a bridge between satisfied clients and fulfilled employees, ensuring that your job and well-being are our top priorities because your satisfaction leads to the success of our clients. Join us as we continue building the future of secure, high-impact solutions.

Requirements

Active TS/SCI with Full Scope Polygraph
Expert Core Java proficiency
Deep command of enterprise-grade web, API, PKI, and Linux technologies
Mastery of Java 17 or higher
Eclipse IDE
JVM/JRE/JDK internals
JSP
AJAX
jQuery
Front-end development
Deploying and tuning applications on Apache Tomcat 11+
Configuring Tomcat connectors and HTTPD
MariaDB (MySQL) v10 or latest
HTML5
CSS
JSON/XML HTTP
HTTPS
REST API
SSH
PKI
OpenSSL
Putty
Linux
LDAP
LDAP authentication and authorization
Custom LDAP-based solutions
SSH and Putty
Custom SSH-based tools and applications on Linux platform
Linux system administration and command-line tools
Java REST API development
API secure requests using application certificates
Scalability for user activity monitoring
JDBC
DAO pattern and configuration using MariaDB (MySQL)
Custom database tools and scripts
Connection pooling without framework
Deploying applications on Apache Tomcat
Configuring Tomcat connectors
Managing HTTPD (Apache HTTP Server)
Front-end development w/ JSP, AJAX, jQuery, JavaScript, HTML and CSS design for web presence and back-end development
Writing Jakarta Servlet API, including servlet lifecycle, request and response handling, and session management.
Java Base64 API, that encodes and decodes data, including its usage and limitations.
Knowledge of Java Cryptography Architecture (JCA) and its APIs.
Knowledge of encryption algorithms, such as AES, RSA and ECC and their usage in Java.
Experience w/ Quartz Job Scheduling Library using Core Java development.
Experience w/ software version control tools (Git/GitHub) code repository;
Knowledge of PKI infrastructure and secure data transmission
Custom PKI-based tools and applications
Knowledge of X.509 certificate handling, including certificate parsing, certificate validation and certificate chaining.
Experienced in generating, managing, and storing key pairs using OpenSSL, and RSA
Troubleshooting PKI-related issues, including key pair and certificate problems.
Strong problem-solving skills and analytical thinking
Attention to detail
Excellent communication and collaboration skills with technical and non-technical stakeholders.
Ability to analyze user needs to determine technical requirements.
Ability to write clean, maintainable, and well-documented code.
Shows initiative and offers ideas for new products and improvements to existing interfaces.
Actively keeps apprised of industry technological enhancements and changes.

Nice To Haves

Some experience integrating Python into web applications
Some experience Writing Confluence plugins
Familiar w/ Windows Active Directory Certificate Services (AD CS) – for issuing and managing key infrastructure (PKI) certificates.

Responsibilities

SME Level
Expert-level knowledge of Core Java (NOT Spring Boot), Eclipse IDE v2026, Java 17 or later, JVM, JRE, and JDK concepts, JavaScript, AJAX, jQuery, JSP, Apache Tomcat 11 or later, Tomcat connector, MariaDB (MySQL) v10 or latest, HTML5, CSS, JSON/XML HTTP, HTTPS, REST API, SSH, PKI, OpenSSL, Putty, Linux and LDAP.
Extensive experience with LDAP authentication and authorization, and custom LDAP-based solutions
Strong experience with SSH and Putty, and custom SSH-based tools and applications on Linux platform
Linux system administration and command-line tools
Java REST API development, and API secure requests using application certificates and scalability for user activity monitoring
JDBC, DAO pattern and configuration using MariaDB (MySQL) and custom database tools and scripts – connection pooling without framework
Deploying applications on Apache Tomcat, configuring Tomcat connectors, and managing HTTPD (Apache HTTP Server)
Front-end development w/ JSP, AJAX, jQuery, JavaScript, HTML and CSS design for web presence and back-end development;
Writing Jakarta Servlet API, including servlet lifecycle, request and response handling, and session management.
Java Base64 API, that encodes and decodes data, including its usage and limitations.
Knowledge of Java Cryptography Architecture (JCA) and its APIs.
Knowledge of encryption algorithms, such as AES, RSA and ECC and their usage in Java.
Experience w/ Quartz Job Scheduling Library using Core Java development.
Experience w/ software version control tools (Git/GitHub) code repository;
Knowledge of PKI infrastructure and secure data transmission, and custom PKI-based tools and applications
Knowledge of X.509 certificate handling, including certificate parsing, certificate validation and certificate chaining.
Experienced in generating, managing, and storing key pairs using OpenSSL, and RSA, troubleshooting PKI-related issues, including key pair and certificate problems.
Strong problem-solving skills and analytical thinking, attention to detail, and excellent communication and collaboration skills with technical and non-technical stakeholders.
Ability to analyze user needs to determine technical requirements.
Ability to write clean, maintainable, and well-documented code.
Shows initiative and offers ideas for new products and improvements to existing interfaces.
Actively keeps apprised of industry technological enhancements and changes.