Contract Senior Java Developer Jobs in Maryland (NOW HIRING)

Job Description Position Summary Base-2 Solutions is seeking a Senior Java Developer to modernize a critical government information system. The ideal candidate will have deep expertise in enterprise Java application development and a proven track record of upgrading complex software infrastructures in secure, regulated environments. The role involves planning and executing upgrades across the technology stack, including Apache Solr with ZooKeeper, Apache Tomcat, Apache Directory Studio, and Java/Python components running on Windows-based VMware infrastructure. Strong knowledge of Oracle 19c database integration, SAP Business Intelligence reporting frameworks, secure coding practices, and upgrading and migrating Solr index data is essential. Experience with PrimeFaces UI framework is a plus. The candidate will collaborate with cross-functional teams including security, infrastructure, and business stakeholders to ensure seamless upgrades with minimal operational disruption. Essential Duties and Responsibilities * Plan and execute technology stack upgrades for enterprise Java applications in secure government environments. * Develop and maintain Java/Python components on Windows-based VMware infrastructure. * Modernize legacy application code to current standards and best practices. * Implement secure coding practices in compliance with government security requirements. * Upgrade Apache Solr clusters with ZooKeeper coordination. * Migrate and optimize Solr index data during version upgrades. * Manage Apache Tomcat application server configurations and deployments. * Integrate applications with Oracle 19c database systems. * Work with Apache Directory Studio for directory services integration. * Support SAP Business Intelligence reporting framework integrations. * Collaborate with security, infrastructure, and business stakeholder teams. * Ensure minimal operational disruption during system upgrades. * Document technical designs, upgrade procedures, and system configurations. * Participate in code reviews and knowledge-sharing sessions. Required Qualifications * Expertise in enterprise Java application development on Windows-based VMware infrastructure. * Expertise with Python. * Expertise with Apache Solr with ZooKeeper (including upgrading and migrating Solr index data). * Experience with Apache Tomcat, Apache Directory Studio. * Experience with Oracle 19c/relational database integration. * Experience with SAP Business Intelligence reporting frameworks. * Experience with secure coding practices for government compliance. Preferred Qualifications * Experience with PrimeFaces UI framework. Required Education and Experience Equivalency * Bachelor's degree with 9 years of experience. * Master's degree with 7 years of experience. * No degree with 13+. Required Certifications * None specified. Required Security Clearance * Active Top Secret/SCI with CI Polygraph Pay & Benefit Highlights Compensation * Competitive fixed salary or hourly pay (based on experience, skills, location, and internal equity). * Employee referral bonuses up to $10,000 per hired referral. * Additional bonus opportunities for exceptional performance and contributions to business development and company growth (role-dependent). Health * 100% company-paid medical premiums for employees and eligible dependents. * Choose from multiple plan options with CareFirst, Kaiser, and UnitedHealthcare, including PPO, POS, HMO, and HSA-compatible plans. * 100% company-paid dental premiums for employees and eligible dependents. * 100% company-paid vision premiums for employees and eligible dependents. Income Protection * 100% company-paid premiums for short-term disability. * 100% company-paid premiums for long-term disability. * 100% company-paid premiums for accidental death & dismemberment (AD&D). * 100% company-paid premiums for life insurance up to $200,000. Retirement * 401(k) with immediate vesting: 4% company match plus a 4% non-elective company contribution (8% total). * 401(k) pre-tax and Roth options. Leave * Up to 20 days of flexible paid time off (PTO). * 11 paid floating holidays. Work-Life Balance * Flexible work schedules, including flex time and compressed work periods (contract and project-dependent). NT