VG Software Engineer 3

Probity Inc.; McLean (VA); On-site; USD 120,000 - 190,000; Full time

Job summary

Probity is seeking a senior Java developer with Top Secret/SCI Clearance for Dulles/McLean. You will design and implement secure back-end services using Java 17+, manage LDAP-based auth, PKI/TLS, and oversee API security. The role requires Linux expertise, Tomcat/HTTPD configuration, and experience with JDBC/DAO and database tools.

You will collaborate with stakeholders, craft clean, well-documented code, and continuously pursue improvements while staying current with industry advances.

Qualifications

• Extensive LDAP auth/authorization experience.
• SSH-based tools on Linux; strong Linux CLI skills.
• Java REST API development with security and scalability.
• Experience with JDBC/DAO, MariaDB/MySQL, and connection pooling without a framework.
• Tomcat deployment, connectors, and HTTPD configuration.
• Jakarta Servlet API usage and lifecycle handling.
• Cryptography basics and usage in Java (JCA).
• PKI concepts, X.509, OpenSSL, and certificate management.
• Quartz scheduling for batch jobs.
• Source control with Git/GitHub.
• Secure PKI integration across services.
• Strong problem solving, communication with diverse stakeholders.
• Ability to translate user needs into technical requirements.
• Commitment to clean, well-documented code and continuous improvement.
• Keep up with industry tech updates.

Responsibilities

• Develop and maintain Java back-end services (Java17+).
• Secure REST APIs and certificate-based authentication/authorization.
• Work with LDAP and PKI to ensure secure data transmission.
• Integrate with Tomcat, Apache HTTP Server, and related tooling.
• Implement and maintain database access via JDBC/DAO.
• Create reliable, scalable services with proper session handling.
• Utilize OpenSSL for key management and TLS configurations.
• Collaborate with cross-functional teams and stakeholders.

Skills

LDAP authentication

SSH and Putty

Linux administration

Java REST API

API security & certificates

JDBC & DAO

Servlet lifecycle

Base64 usage

JCA APIs

Encryption (AES/RSA/ECC)

Quartz scheduling

Git / GitHub

PKI infrastructure

X.509 handling

OpenSSL & key management

Problem solving & communication

Requirements analysis

Clean code & maintainability

主动性 / initiative

Industry awareness

Tools

Apache Tomcat

Apache HTTP Server

OpenSSL

X.509 certificates

PKI tools

Git

AD CS (Windows)

Job description

PLEASE NOTE: This position requires an ACTIVE Top Secret/SCI Clearance with Polygraph. To be considered for this position, you MUST have an ACTIVE Clearance Level of Top Secret/SCI with Polygraph

Position Code: 03-SO0924-1

Dulles/McLean

Requires strong Java development (Java17 or later), Confluence, JAVA EE development experience or Jakarta; PKI SSL/TLS. No cloud experience required.

Required skills:

• 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
• Experience with Linux system administration and command-line tools
• Experience w/ Java REST API development, and API secure requests using application certificates and scalability for user activity monitoring
• Experienced w/ JDBC, DAO pattern and configuration using MariaDB (MySQL) and custom database tools and scripts – connection pooling without framework
• Experience deploying applications on Apache Tomcat, configuring Tomcat connectors, and managing HTTPD (Apache HTTP Server)
• Experienced writing Jakarta Servlet API, including servlet lifecycle, request and response handling, and session management.
• Experience w/ 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.

Desired skills:

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