Explore 4 back end java developer jobs from 3 hiring companies in Gettysburg, PA, US. Filter by remote, salary, experience, and company, then open any listing to apply.

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Back End Java Developer

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Back End Java Developer Jobs

Noetic Strategies

iCallidus

Two Six Technologies

Onsite

Hybrid

Remote

<div>
 Back End Developer
 </div><h3>Description</h3><div>
 <div>
 At iCallidus, we are innovators harnessing the power of creative thinkers to develop, execute, and manage groundbreaking IT solutions. Our multidisciplinary team excels in cybersecurity, digital modernization, transformation, and strategic management, ensuring our clients stay ahead in a dynamic tech landscape. We prioritize user-centric designs, building secure, scalable, and efficient systems tailored to meet specific business needs. Our commitment to cost-effective solutions enables clients to achieve more without significant cost escalations. With a robust portfolio of successful projects across various sectors and a proven track record, we consistently deliver high-quality results, helping organizations enhance performance and security while embracing the future of technology.   The Back-End Developer will be responsible for designing, developing, and maintaining server-side logic, databases, and APIs that support front-end applications and system integrations. Key Responsibilities:•	Develop, maintain, and optimize scalable server-side applications and APIs.•	Design and manage databases ensuring efficient data storage and retrieval.•	Implement security best practices to protect sensitive data.•	Work closely with front-end developers and system architects to integrate applications.•	Troubleshoot, debug, and resolve back-end issues efficiently.•	Ensure system performance, scalability, and reliability.•	Maintain technical documentation and collaborate in Agile development cycles. Qualifications and Requirements:•	Bachelor’s Degree in Information Technology, Computer Science, Information Systems, Project Management, Cybersecurity, or related field. •	Minimum of seven (7) years of experience in back-end development, proficient in server-side technologies and latest frameworks. Proven ability to build robust, scalable systems and collaborate effectively in an agile environment.•	Experience working on Agile teams and utilizing the latest back-end development tools, techniques, and methods for building and deploying server-side applications. Comfortable operating in an agile and lean environment to regularly deploy updates and enhancements.•	Strong experience with Java, Python, .NET, Node.js, or similar languages.•	Proficiency with databases like PostgreSQL, MySQL, MongoDB, or SQL Server.•	Experience with RESTful APIs and microservices architecture.•	Familiarity with CI/CD tools and cloud platforms like AWS, Azure, or GCP.•	Understanding of secure coding practices and OWASP guidelines.Employment Type:•	Full Time, Hybrid – Must be able to report on-site at client’s location, as required.  Security Clearance:•	Must be able to obtain and maintain a security clearance. Active MBI Clearance preferred.•	US Citizenship or Lawful Permanent Resident required.Benefits:•	Medical, Vision, Dental, 401(K), Short Term Disability, Standard Basic Life Insurance. Paid Time Off (PTO) will take into effect after the 90-day probationary period. EEO StatementICallidus is an Equal Opportunity/Affirmative Action Employer. We do not unlawfully discriminate because of race, color, religion, age, sex, creed, national origin, ancestry, citizenship status, marital or domestic or civil union status, familial status, affectional or sexual orientation, gender identity or expression, genetics, disability, military eligibility or veteran status, or any other protected status. Salary range: $120,000 - $140,000 per year 
 </div>
 </div><h3>About the Company</h3><div>
 <div>
 Tech
 </div>
 </div>

Back End Developer/Engineer (MBI Clearance)

Back End Developer/Engineer

7+ years back-end development; proficient in Java, Python, .NET, Node.js; REST/microservices; databases; cloud platforms; secure coding; MB I clearance preferred.

Job Title
Backend Software Engineer&nbsp;
&nbsp;
Location
Gaithersburg, MD/Alexandria, VA/Chantilly, VA/St. Louis MO, Tucson, AZ&nbsp;
&nbsp;
Position Requirements
Active Top Secret Clearance
&nbsp;
SUMMARY
&nbsp;
We're hiring a Backend Software Engineer to support a high‑visibility, data‑driven application used across the organization for analytics and reporting. You'll help build and maintain core backend services, develop RESTful APIs, support data‑driven functionality, and contribute to ongoing system enhancements within a Linux‑based environment. Your work will directly support system reliability, performance, and data accuracy for mission stakeholders. Our primary development team operates out of Gaithersburg, MD, but we also support onsite engineers in Alexandria, VA; Chantilly, VA; St. Louis, MO; and Tucson, AZ, giving top talent multiple paths to join the mission.
&nbsp;
&nbsp;
PRIMARY DUTIES AND RESPONSIBILITIES 
&nbsp;
<ul>
<li>Backend Development: Design, develop, test, and maintain backend application components using Java or Python</li>
<li>REST API Development: Develop and maintain RESTful services to support application functionality and system integrations</li>
<li>Object-Oriented Programming: Apply object-oriented design principles to build scalable and maintainable systems</li>
<li>Database Development: Write and modify SQL queries to support application functionality and data retrieval</li>
<li>Data Source Collaboration: Collaborate with internal and external teams to understand data sources, formats, and access methods, and support integration into backend systems</li>
<li>Linux Environments: Develop and troubleshoot applications within Linux-based environments</li>
<li>Data Processing &amp; Business Logic: Implement backend logic for data transformation, processing, and system workflows</li>
<li>Bug Fixing &amp; Enhancements: Identify, debug, and resolve application-level defects and performance issues</li>
<li>Code Quality: Follow coding standards, participate in code reviews, and support documentation efforts</li>
</ul>
&nbsp;
BASIC QUALIFICATIONS:
&nbsp;
<ul>
<li>
Bachelor's degree in Computer Science, Software Engineering, or a related field with 8–12 years of experience; or a Master's degree with 6–10 years of experience
</li>
<li>US Citizenship</li>
<li>Active TS/SCI with the ability to successfully pass a Polygraph</li>
<li>Professional experience developing object‑oriented applications in Java or Python</li>
<li>Hands‑on experience building and maintaining RESTful APIs</li>
<li>Basic to moderate experience with SQL capability, including writing queries and working with relational databases</li>
<li>Working knowledge of Linux‑based environments</li>
<li>Ability to work independently on defined tasks within established technical frameworks and deliver reliable results</li>
</ul>
&nbsp;
DESIRED QUALIFICATIONS:
<ul>
<li>Experience with Apache Airflow or similar workflow orchestration technologies</li>
<li>Experience with Spring Boot, Django, or similar backend frameworks</li>
<li>Exposure to CI/CD pipelines (GitLab, Jenkins, etc.)</li>
<li>Familiarity with containerization (Docker, OpenShift)</li>
<li>Exposure to cloud environments (AWS or Azure)</li>
<li>Experience working in Agile development environments</li>
</ul>
&nbsp;
&nbsp;
&nbsp;
&nbsp;

Backend Software Engineer

US citizen; TS/SCI with poly; BS in CS/SE with 8–12 yrs (MS with 6–10); Java or Python; REST APIs; SQL; Linux; ability to work independently.

Job Title
Mid-Level Backend Software Engineer&nbsp;
&nbsp;
Location
Gaithersburg, MD/Alexandria, VA/Chantilly, VA/St. Louis MO, Tucson, AZ&nbsp;
&nbsp;
Position Requirements
Active Top Secret Clearance
&nbsp;
SUMMARY
&nbsp;
We're hiring a Backend Software Engineer to support a high‑visibility, data‑driven application used across the organization for analytics and reporting. You'll help build and maintain core backend services, develop RESTful APIs, support data‑driven functionality, and contribute to ongoing system enhancements within a Linux‑based environment. Your work will directly support system reliability, performance, and data accuracy for mission stakeholders. Our primary development team operates out of Gaithersburg, MD, but we also support onsite engineers in Alexandria, VA; Chantilly, VA; St. Louis, MO; and Tucson, AZ, giving top talent multiple paths to join the mission.
&nbsp;
&nbsp;
PRIMARY DUTIES AND RESPONSIBILITIES 
&nbsp;
<ul>
<li>Backend Development: Design, develop, test, and maintain backend application components using Java or Python</li>
<li>REST API Development: Develop and maintain RESTful services to support application functionality and system integrations</li>
<li>Object-Oriented Programming: Apply object-oriented design principles to build scalable and maintainable systems</li>
<li>Database Development: Write and modify SQL queries to support application functionality and data retrieval</li>
<li>Data Source Collaboration: Collaborate with internal and external teams to understand data sources, formats, and access methods, and support integration into backend systems</li>
<li>Linux Environments: Develop and troubleshoot applications within Linux-based environments</li>
<li>Data Processing &amp; Business Logic: Implement backend logic for data transformation, processing, and system workflows</li>
<li>Bug Fixing &amp; Enhancements: Identify, debug, and resolve application-level defects and performance issues</li>
<li>Code Quality: Follow coding standards, participate in code reviews, and support documentation efforts</li>
</ul>
&nbsp;
BASIC QUALIFICATIONS:
&nbsp;
<ul>
<li>Bachelor's degree in Computer Science, Software Engineering, or a related field with 4–8 years of experience; or a Master's degree with 2–6 years of experience</li>
<li>US Citizenship</li>
<li>Active TS/SCI with the ability to successfully pass a Polygraph</li>
<li>Professional experience developing object‑oriented applications in Java or Python</li>
<li>Hands‑on experience building and maintaining RESTful APIs</li>
<li>Basic to moderate experience with SQL capability, including writing queries and working with relational databases</li>
<li>Working knowledge of Linux‑based environments</li>
<li>Ability to work independently on defined tasks within established technical frameworks and deliver reliable results</li>
</ul>
&nbsp;
DESIRED QUALIFICATIONS:
<ul>
<li>Experience with Apache Airflow or similar workflow orchestration technologies</li>
<li>Experience with Spring Boot, Django, or similar backend frameworks</li>
<li>Exposure to CI/CD pipelines (GitLab, Jenkins, etc.)</li>
<li>Familiarity with containerization (Docker, OpenShift)</li>
<li>Exposure to cloud environments (AWS or Azure)</li>
<li>Experience working in Agile development environments</li>
</ul>
&nbsp;
&nbsp;
&nbsp;
&nbsp;

Mid-Level Backend Software Engineer

Active TS/SCI clearance; US citizenship; bachelor's or master's in CS/Software Eng with relevant experience; Java or Python; REST APIs; Linux; SQL; ability to work independently.

<div class="content-intro">At Two Six Technologies, we build, deploy, and implement innovative products that solve the world’s most complex challenges today. Through unrivaled collaboration and unwavering trust, we push the boundaries of what’s possible to empower our team and support our customers in building a safer global future.</div>Overview of Opportunity
We are seeking a high-caliber Senior Backend Engineer with a rare blend of legacy expertise and modern systems design. You will be tasked with bridging the gap between established Java infrastructures and high-performance Golang development.
This role is not for the faint of heart. You will be responsible for deconstructing, re-architecting, and rewriting large, mission-critical codebases that power global telecommunications, ensuring they are scalable, resilient, and future-proof.
This is a remote role.&nbsp;
 Key Responsibilities:
<ul>
<li>Legacy Transformation: Take ownership of large, complex Java codebases and strategically migrate towards&nbsp;high-performance Golang microservices.</li>
<li>Protocol Development: Design and maintain low-level communication interfaces involving SS7 (MAP) and&nbsp;DIAMETER protocols.</li>
<li>System Architecture:&nbsp;Build and optimize highly available resilient systems capable of handling multiple client connections.</li>
<li>Database Management: Design schemas and optimize queries for both MySQL and PostgreSQL to ensure data integrity and performance. Understand existing data structures and migrate them as appropriate.</li>
<li>Queue Management: Implement and manage robust job queues and asynchronous task frameworks to handle API traffic and background processing.</li>
</ul>
Technical Requirements:
<ul>
<li>Dual-Stack Understanding: Expert-level proficiency in both Java and Golang. You should be equally comfortable navigating existing code and writing equivalent high-concurrency Go routines.\</li>
<li>Telecom Domain Knowledge: A deep, fundamental understanding of Signaling System No. 7 (SS7) and DIAMETER. You should be comfortable discussing the signaling stack from the MTP layers through to the application part.</li>
<li>Database Expertise: Advanced experience with MySQL and PostgreSQL, including performance tuning and distributed database patterns.</li>
<li>Task Orchestration and Notifications: Deep understanding of job queues and task management (e.g.,&nbsp;RabbitMQ, Kafka, or custom-built Go workers).</li>
<li>API Capability: Comfortable with API models and specifying and writing endpoints to be used by adjacent applications.</li>
</ul>
 Professional Attributes &amp; Expectations:
<ul>
<li>A "Re-write" Mindset: You are not intimidated by code that has undergone iterations and layers of&nbsp; with minimal documentation. You have the patience and skill to deconstruct complex logic and rebuild it to a superior standard.</li>
<li>High Agency: A drive to see tasks through to completion. You take pride in delivering robust, high-standard code.</li>
<li>Global Mobility: This role requires the ability to travel for extended periods to coordinate with global teams or oversee on-site deployments.</li>
<li>Flexibility: We offer flexible working hours to accommodate your peak productivity times, provided project milestones are met.</li>
</ul>
Why Join Us?
You will be at the heart of the infrastructure that connects the world, solving hard problems in distributed computing and telecommunications. If you prefer deep technical challenges over routine feature updates, we&nbsp;want to hear from you.
&nbsp;
#LI-MS1
#remote<div class="content-pay-transparency"><div class="pay-input"><div class="description">Two Six Technologies is committed to providing competitive and comprehensive compensation packages that reflect the value we place on our employees and their contributions. We believe in rewarding skills, experience, and performance. Our offerings include but are not limited to, medical, dental, and vision insurance, life and disability insurance, retirement benefits, paid leave, tuition assistance and professional development.
The projected salary range listed for this position is annualized. This is a general guideline and not a guarantee of salary. Salary is one component of our total compensation package and the specific salary offered is determined by various factors, including, but not limited to education, experience, knowledge, skills, geographic location, as well as contract specific affordability and organizational requirements.</div><div class="title">Salary Range</div><div class="pay-range">$150,000&mdash;$200,000 USD</div></div></div><div class="content-conclusion"><div class="iCIMS_PageFooter">
<div class="gmail_default">
Looking for other great opportunities? Check out <a href="https://twosixtech.com/careers/current-opportunities/">Two Six Technologies Opportunities</a> for all our Company’s current openings!&nbsp;
Ready to make the first move towards growing your career? If so, check out the <a href="https://twosixtech.com/careers/candidate-resources/">Two Six Technologies Candidate Journey</a>!&nbsp; This will give you step-by-step directions on applying, what to expect during the application process, information about our rich benefits and perks along with our most frequently asked questions.&nbsp; If you are undecided and would like to learn more about us and how we are contributing to essential missions, check out our&nbsp; <a href="https://twosixtech.com/about/news/">Two Six Technologies News </a>&nbsp;page!&nbsp; We share information about the tech world around us and how we are making an impact!&nbsp; Still have questions, no worries!&nbsp; You can reach us at <a href="https://twosixtech.com/contact/">Contact Two Six Technologies</a>. We are happy to connect and cover the information needed to assist you in reaching your next career milestone.
Two Six Technologies is an Equal Opportunity Employer and does not discriminate in employment opportunities or practices based on race (including traits historically associated with race, such as hair texture, hair type and protective hair styles (e.g., braids, twists, locs and twists)), color, religion, national origin, sex (including pregnancy, childbirth or related medical conditions and lactation), sexual orientation, gender identity or expression, age (40 and over), marital status, disability, genetic information, and protected veteran status or any other characteristic protected by applicable federal, state, or local law.&nbsp;
If you are an individual with a disability and would like to request reasonable workplace&nbsp;accommodation for any part of our employment process, please send an email to <a href="mailto:accommodations@twosixtech.com">accommodations@twosixtech.com</a>. Information provided will be kept confidential and used only to the extent required to provide needed reasonable accommodations.
Additionally, please be advised that this business uses E-Verify in its hiring practices.
By submitting the following application, I hereby certify that to the best of my knowledge, the information provided is true and accurate.
</div>
</div></div>

Senior Backend Engineer (Telcoms Specialist)

Senior Backend Engineer

Expert in Java and Golang; telecom domain knowledge (SS7/DIAMETER); MySQL and PostgreSQL experience; knowledge of job queues (RabbitMQ, Kafka); design of scalable, distributed systems.

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