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sr. backend/middleware engineer Jobs in Washington

sr. backend/middleware engineer

senior net developer

Mobomo, LLC

<div>We are seeking a full-time, backend-focused Senior .NET Developer to support application modernization initiatives and ongoing maintenance of legacy systems. This role requires a hands-on engineer with strong experience in modern backend technologies, containerized environments, and CI/CD pipelines, as well as the ability to lead and mentor other developers. 
Responsibilities<ul><li>
Participate in the analysis, design, and development of system modernization efforts</li><li>
Support and enhance existing legacy applications</li><li>
Lead and contribute to Agile development activities, including standups, user stories, backlog grooming, and task execution</li><li>
Build, maintain, and enhance backend services using .NET (C#), GraphQL, and relational databases</li><li>
Contribute to and support CI/CD pipeline development and deployment processes</li><li>
Implement and maintain containerized solutions and troubleshoot deployment issues</li><li>
Design and implement unit tests, review load testing results, and identify performance bottlenecks</li><li>
Troubleshoot defects and recommend system optimizations and enhancements</li><li>
Collaborate closely with stakeholders and a small development team, providing technical guidance and mentorship</li></ul>
Required Qualifications 
Minimum of 5 years of experience as a software engineer in backend development 
Strong experience building applications using .NET (C#) 
Experience developing and maintaining GraphQL APIs 
Experience with Postgres and/or MSSQL databases 
Experience designing and maintaining data models and schemas 
Experience serving as a senior or lead engineer on development projects<ul><li>
Experience with Agile methodologies, Docker/containerization, and CI/CD pipelines</li><li>
Ability to work independently and collaboratively while mentoring junior developers</li><li>
Strong experience gathering requirements and working directly with stakeholders</li></ul>
Preferred Qualifications 
Experience working with legislative systems or legislative data 
Experience with Microsoft Azure 
Familiarity with MEAN stack (MongoDB, Express, Angular, Node.js) and/or React.js
Location 
Capitol Hill, Washington D.C. 
Some work may be performed off-site with approval and at the discretion of the POC. 
About Mobomo:
Mobomo is a full-service DevOps agency dedicated to creating elegant solutions to solve complex problems.
Mobomo benefits include health care, paid time off, retirement savings and professional development.
Mobomo is an equal opportunity employer and we value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, gender identity or expression, sexual orientation, age, marital status, citizenship status, veteran status, disability status or any other basis as protected by federal state, or local law.
Codp0F42GX</div>

Senior .NET Developer

Autonomic Solutions

GraphQL and .Net Applications Developer (Mid to Senior)Autonomic Solutions LLC., (https://www.autonomicsolutionsllc.com) is a Virginia SWaM certified small business providing mission-focused Digital and Cloud solutions to enable digital transformation and technology innovation for clients. Our services include Applications Development, Systems Modernization and Integration, Cloud Computing, DevSecOps, Data Analytics (including AI/ML/GenAI) and Infrastructure Optimization.We are pursing IT contract opportunities with federal and state government and submitting proposals for RFP and RFI bids. The following requirement is contingent upon contract award from government/prime (February /March 2026 timeline).Job Title: Applications Integration Engineer &ndash; GraphQL + .NET Core (Contingent on Award)Job Type: Full-time | Contract | Hybrid (U.S. Citizen only)About the Role: We are seeking a skilled and motivated Applications Integration Engineer to support a proposed modernization project focused on building GraphQL-based APIs for structured data delivery in a secure, containerized environment in Azure cloud. This role is contingent on award of a federal technology modernization initiative expected to begin in early 2026.As an Integration Engineer, you will help design and develop a federated GraphQL API using .NET Core, Hot Chocolate GraphQL server solution, and containerized services deployed to Kubernetes. You will work closely with other engineers and stakeholders in an Agile team, participate in sprint ceremonies, and contribute to DevOps-enabled CI/CD workflows.Key Responsibilities:<ul><li>Develop and maintain GraphQL subgraphs using Hot Chocolate and ASP.NET Core</li><li>Integrate data from PostgreSQL and existing REST services into new GraphQL endpoints</li><li>Support GraphQL federation via a router/gateway (e.g., Apollo Router)</li><li>Participate in Agile ceremonies, including sprint planning, code reviews, and retrospectives</li><li>Implement secure authentication via OAuth2/JWT</li><li>Deploy services via Helm to Kubernetes as part of a CI/CD pipeline</li></ul>Required Skills &amp; Experience:<ul><li>5+ years in software engineering with .NET Core (C#)</li><li>2-3 years of working with GraphQL (preferably using Hot Chocolate)</li><li>Familiarity with GraphQL federation concepts or interest in learning fast</li><li>Experience working with PostgreSQL or other relational databases</li><li>Familiarity with CI/CD tools (e.g., Azure DevOps, GitHub Actions, GitLab)</li><li>Experience developing and running applications in containers (Docker, Kubernetes)</li><li>Strong Git and source control habits</li><li>U.S. Citizen; able to work on federal projects</li></ul>Nice to Have:<ul><li>Experience with Helm, Prometheus, OpenTelemetry</li><li>Prior experience in civic tech or government data systems</li><li>Understanding of schema governance and GraphQL best practices</li></ul>Job Types: Full-time, ContractPay: $85,000.00 - $145,000.00 per yearExperience:<ul><li>Application development: 5 years (Required)</li><li>web applications development: 7 years (Preferred)</li><li>GraphQL: 3 years (Preferred)</li><li>.NET: 3 years (Preferred)</li></ul>Work Location: Hybrid remote in Washington, DC 20002

GraphQL and .Net Applications Developer- Mid to Senior

CACI International

<div>.NET Developer
Job Category: Information Technology
Time Type: Full time
Minimum Clearance Required to Start: Secret
Employee Type: Regular
Percentage of Travel Required: Up to 10%
Type of Travel: Local
* * * 
The Opportunity: 
CACI is seeking an experienced software developer who is interested working on innovative software development programs that support our nation&rsquo;s defense. Join us for this exciting and challenging opportunity as a member of an Agile Scrum Team focused on delivering new capabilities as part of a large program team that builds and supports Department of Defense financial management systems. You will be using modern web technologies and enhance your expertise as a software developer. You will get to contribute immediately in a dynamic, fast-paced, high visibility environment. Your ability to work in a fast-paced environment and be flexible to changing requirements will be important to your success.
*Applicants must be local to the DC area to report onsite as needed* 
 
Responsibilities:<ul><li>
Participate on an Agile team in the planning, design, development, and support of .NET/C# based web financial management applications.</li><li>
Work closely with business analysts and subject matter experts to understand functional requirements.</li><li>
Design, develop, unit test, debug, document, and maintain program code.</li><li>
Design, develop, and maintain scalable RESTful and GraphQL APIs.</li><li>
Support formal testing before code is deployed to production.</li><li>
Deliver development efforts that result in well organized and structured deliverables aimed at being easy to understand by others on the development team.</li><li>
Articulate ideas and communicate verbally and in writing task status, unit test results, technical concepts, issues, and questions with the team</li></ul> 
Qualifications: 
 
Required:<ul><li>
Active DoD Secret security clearance is required</li><li>
Bachelor&rsquo;s degree in relevant field or equivalent work experience</li><li>
10+ years experience developing web applications, including team lead experience</li><li>
7+ years experience developing .NET applications</li><li>
7+ years experience using Microsoft Visual Studio</li><li>
Experience with DevOps platform (i.e., Azure DevOps, GitLab, Atlassian Suite, Digital.ai)</li><li>
8570 IAT Level II certification required</li></ul> 
Desired:<ul><li>
Experience with DoD software/web development best practices</li><li>
Experience with Containerization</li><li>
Experience with DevSecOps Pipelines (GitLab, etc.)</li></ul><ul><li></li></ul>
________________________________________________________________________________________
What You Can Expect: 
A culture of integrity.
At CACI, we place character and innovation at the center of everything we do. As a valued team member, you&rsquo;ll be part of a high-performing group dedicated to our customer&rsquo;s missions and driven by a higher purpose &ndash; to ensure the safety of our nation. 
An environment of trust.
CACI values the unique contributions that every employee brings to our company and our customers - every day. You&rsquo;ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.
A focus on continuous growth.
Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground &mdash; in your career and in our legacy. 
Your potential is limitless. So is ours.
Learn more about CACI here.
________________________________________________________________________________________
Pay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits. Learn more here.
The proposed salary range for this position is:
$103,800 - $218,100<div>
CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.</div></div>

.NET Developer

Metrostar Systems

<div>As Senior Platform Developer, you'll provides subject matter expertise to the team and the customer for all things development with the goal to make an impact across the federal government.

What you'll do:
<ul>
<li>Provide subject matter expertise, in regard to development, to the team and the customer</li>
<li>Research, design, test, evaluate, and implement technologies related to Kubernetes, containerization and other infrastructures</li>
<li>Work on the core platform to create and optimize all functions needed to establish a strong platform infrastructure</li>
<li>Collaborates with the team and the customer daily</li>
</ul>
What you'll need to succeed:
<ul>
<li>8 years of experience as a software developer or engineer</li>
<li>3 years of experience with Infrastructure as Code (IaC), containerization, K8, and CI/CD Automation</li>
<li>Experience with .NET, Java, Python, and Go; as well as experience working in a DevSecOps environment</li>
<li>Experience with Source Code repositories and CI/CD pipeline solutions such as Team Foundation Server/Azure DevOps, Bitbucket, and GitHub</li>
<li>Experience with container orchestration tools (Rancher, OpenShift, etc.)</li>
<li>A bachelor's degree</li>
<li>Active TS/SCI security clearance</li>
<li>Ability to work in Washington, DC on client-site 2-3 days per week</li></ul> 


SALARY RANGE: $175,000 - $184,000

The salary range for this position is determined based on qualifications, skills, and relevant experience. The final salary offered will be determined based on several factors including:
<ul>
<li>The candidate's professional background and relevant work experience</li>
<li>The specific responsibilities of the role and organizational needs</li>
<li>Internal equity and alignment with current team compensation</li>
<li>This role is also eligible for additional compensation, subject to the terms and policies of MetroStar, which may include:</li>
<li><ul><li>Performance-based bonuses</li>
<li>Company-paid training and/or certifications</li>
<li>Referral bonuses</li>
</ul></li>
</ul><div>To apply for this position, please submit your resume via the form below or through our careers page: https://www.metrostar.com/jobs/

Application Deadline: Applications will be accepted on a rolling basis until the position is filled; candidates are encouraged to apply as early as possible for full consideration.

Additional Compensation: This role may also be eligible for bonuses and/or additional incentives based on individual and company performance.

Benefits: All full-time employees are eligible to participate in our benefits programs:
<ul>
<li>Health, dental, and vision insurance</li>
<li>401(k) retirement plan with company match</li>
<li>Paid time off (PTO) and holidays</li>
<li>Parental Leave and dependent care</li>
<li>Flexible work arrangements</li>
<li>Professional development opportunities</li>
<li>Employee assistance and wellness programs</li>
</ul>
Like we said, we are big fans of our people. That's why we offer a generous benefits package, professional growth, and valuable time to recharge. Learn more about our company culture code and benefits. Plus, check out our accolades.

Commitment to Non-Discrimination 
All qualified applicants will receive consideration for employment based on merit and without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, status as a protected veteran, or any other status protected by applicable federal, state, local, or international law.

 What we want you to know:

In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment eligibility verification form upon hire.

 Not ready to apply now?

Sign up to join our newsletter here.</div></div>

Sr. Platform Developer (5244)

Knowledge Management, Inc.

<div>Knowledge Management, Inc. (KMI) has the leadership and experience to deliver innovative technology, logistics and management solutions to meet real mission requirements. KMI is a Minority Business Enterprise (MBE) and Small Disadvantage Business (SDB) that specializes in Logistics, Warehouse Services, Distance Learning/Training, Enterprise Solutions, Financial Management Support, Program Management, Intelligence AnalysisThreat Assessment, and Data Analytics/Operations Research. Since 1998, our solutions and services have helped our clients improve performance, drive cost and operational effectives, and map technology needs for tomorrow's requirements.
Title: Sr. Full Stack Developer
Location: Remote with ability to travel to support case work as required. Some travel requirements may be outside of the USA.
Position: 1
Duration: Multi-year program
Start date: ASAP
Security Clearance: Active US Treasury Public Trust preferred. Anyone with an active DOD clearance, would be processed for a DHS Public Trust.
Salary: Please provide your salary requirement 
 
Knowledge Management, Inc. is seeking a Senior Full Stack Developer to lead the design, development, and maintenance of our secure, mission-critical web applications. This role requires a strong background in both backend and frontend technologies, with a focus on Java, Spring Boot, and integration with AWS Bedrock. The ideal candidate will have a deep understanding of relational databases and experience in delivering high-performance, scalable solutions. 
Key Responsibilities:<ul><li>
Lead the design and development of full-stack applications, ensuring seamless integration between frontend and backend components.</li><li>
Develop and maintain RESTful APIs using Java and the Spring Boot framework, with a focus on security and performance.</li><li>
Integrate AWS Bedrock to leverage foundation models and enhance application capabilities.</li><li>
Design and implement relational database schemas and queries to support application functionality and performance.</li><li>
Collaborate with cross-functional teams to define, design, and ship new features, ensuring alignment with business objectives.</li><li>
Write clean, maintainable, and testable code, adhering to best practices and coding standards.</li><li>
Participate in code reviews and provide mentorship to junior developers, fostering a culture of continuous improvement.</li></ul>
Required Qualifications:<ul><li>
Proven experience as a Full Stack Developer in a senior-level role, with a strong portfolio of delivered projects.</li><li>
Expert-level proficiency in Java and the Spring Boot ecosystem.</li><li>
Hands-on experience integrating and deploying applications with AWS Bedrock.</li><li>
Deep understanding of relational databases (e.g., MySQL, PostgreSQL) and SQL.</li><li>
Proficiency with modern frontend frameworks (e.g., React, Angular, Vue.js).</li><li>
Experience with version control systems, particularly Git.</li><li>
Strong problem-solving skills and a focus on delivering high-quality, secure solutions.</li></ul>
Desired Qualifications:<ul><li>
Familiarity with Nutanix infrastructure and platform solutions.</li><li>
Experience with CI/CD pipelines in GitHub Actions or GitLab CI.</li><li>
Proficiency in containerization with Docker and orchestration with Kubernetes.</li><li>
Knowledge of cloud platforms (e.g., AWS, Azure, GCP) and their services.
</li></ul>Benefits: All full-time employees are eligible to participate in our benefits programs:<ul><li>
Health, dental, and vision insurance</li><li>
401(k) retirement plan</li><li>
Paid time off (PTO) and holidays</li><li>
Group Term Life and Accidental Death and Dismemberment Insurance</li><li>
Voluntary Term Life Insurance</li><li>
Short and Long-term disability insurance
</li></ul>Equal Employment Opportunity Statement. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.
E-Verify Statement. Knowledge Management, Inc. participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S. If E-Verify cannot confirm that you are authorized to work, KMI is required to give you written instructions and an opportunity to contact Department of Homeland Security (DHS) or Social Security Administration (SSA) so you can begin to resolve the issue before the employer can take any action against you, including terminating your employment. Employers can only use E-Verify once you have accepted a job offer and completed the Form I-9.
Pay Transparency Non-Discrimination Provision. Knowledge Management, Inc. will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay or the pay of another employee or applicant. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor's legal duty to furnish information. 41 CFR 60-1.35(c)
Disability Statement. If you have a disability and need reasonable accommodation or assistance at any point in the application or onboarding process, please email us at marie@knowledgemanagement.com.</div>

Sr. Full Stack Developer

<div>Knowledge Management, Inc. (KMI) has the leadership and experience to deliver innovative technology, logistics and management solutions to meet real mission requirements. KMI is a Minority Business Enterprise (MBE) and Small Disadvantage Business (SDB) that specializes in Logistics, Warehouse Services, Distance Learning/Training, Enterprise Solutions, Financial Management Support, Program Management, Intelligence AnalysisThreat Assessment, and Data Analytics/Operations Research. Since 1998, our solutions and services have helped our clients improve performance, drive cost and operational effectives, and map technology needs for tomorrow's requirements.
Title: Jr. Full Stack Developer
Location: Remote with ability to travel to support case work as required. Some travel requirements may be outside of the USA.
Position: 1
Duration: Multi-year program
Start date: ASAP
Security Clearance: Active US Treasury Public Trust preferred. Anyone with an active DOD clearance, would be processed for a DHS Public Trust.
Salary: Please provide your salary requirement
Knowledge Management, Inc. is seeking a Jr. Full Stack Developer to support the development and maintenance of our secure, mission-critical web applications. This role will focus on assisting in the implementation of both frontend and backend components, with an emphasis on learning and growing within the Java, Spring Boot, and AWS Bedrock ecosystem.
Key Responsibilities:<ul><li>
Assist in the development and maintenance of full-stack applications, ensuring seamless integration between frontend and backend components.</li><li>
Contribute to the implementation of RESTful APIs using Java and the Spring Boot framework under the guidance of senior developers.</li><li>
Support the integration of AWS Bedrock to leverage foundation models and enhance application capabilities.</li><li>
Assist in designing and implementing relational database schemas and queries to support application functionality and performance.</li><li>
Collaborate with cross-functional teams to deliver new features, ensuring alignment with business objectives.</li><li>
Write clean, maintainable, and testable code, adhering to best practices and coding standards.</li><li>
Participate in code reviews and contribute to the continuous improvement of development practices.</li></ul>
Required Qualifications:<ul><li>
Experience as a Full Stack Developer, with a solid portfolio of delivered projects.</li><li>
Basic experience or a strong academic background in full-stack development.</li><li>
Familiarity with Java and the Spring Boot framework.</li><li>
Proficiency with modern frontend frameworks (e.g., React, Angular, Vue.js).</li><li>
Understanding of relational databases (e.g., MySQL, PostgreSQL) and SQL.</li><li>
Experience with version control systems, particularly Git.</li><li>
Strong problem-solving skills and a focus on delivering high-quality, secure solutions.</li></ul>
Desired Qualifications:<ul><li>
Basic knowledge of AWS Bedrock and its integration with applications.</li><li>
Familiarity with CI/CD pipelines in GitHub Actions or GitLab CI.</li><li>
Interest in learning containerization with Docker and orchestration with Kubernetes.</li><li>
Understanding of cloud platforms (e.g., AWS, Azure, GCP) and their services.</li></ul>
Benefits: All full-time employees are eligible to participate in our benefits programs:<ul><li>
Health, dental, and vision insurance</li><li>
401(k) retirement plan</li><li>
Paid time off (PTO) and holidays</li><li>
Group Term Life and Accidental Death and Dismemberment Insurance</li><li>
Voluntary Term Life Insurance</li><li>
Short and Long-term disability insurance
</li></ul>Equal Employment Opportunity Statement. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.
E-Verify Statement. Knowledge Management, Inc. participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S. If E-Verify cannot confirm that you are authorized to work, KMI is required to give you written instructions and an opportunity to contact Department of Homeland Security (DHS) or Social Security Administration (SSA) so you can begin to resolve the issue before the employer can take any action against you, including terminating your employment. Employers can only use E-Verify once you have accepted a job offer and completed the Form I-9.
Pay Transparency Non-Discrimination Provision. Knowledge Management, Inc. will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay or the pay of another employee or applicant. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor's legal duty to furnish information. 41 CFR 60-1.35(c)
Disability Statement. If you have a disability and need reasonable accommodation or assistance at any point in the application or onboarding process, please email us at marie@knowledgemanagement.com.</div>

Jr. Full Stack Developer

Realign

<div>Job Type: Contract
Job Category: IT
Job Description
<div>Java Lead Developer 
Location: Washington D.C./Remote 
Contract</div><div></div><div> 
Need 14+ Yrs of Candidate</div><div> 
Technical/Functional Skills</div><ul><div>
Experience in developing Microservices, RESTful Web Services using Springboot, Java</div><div>
Experience in developing applications and services using language Python etc.</div><div>
Designed and developed Microservices business components using Spring Boot, Spring JPA.</div><div>
Experience in developing API for using AWS Lambda to manage the servers and run the code in the AWS.</div><div>
Strong notions of security best practices (e.g. using IAM Roles, KMS, etc.).</div><div>
Hands on Experience in writing Lambda functions</div><div>
Integrate AWS with API, writing triggers, jobs</div><div>
Develop and maintain applications written for Amazon Simple Storage Services (S3), Amazon Dynamo DB, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), Amazon Simple Workflow Service (SWS), AWS Elastic Beanstalk, and AWS Cloud Formation. Able to design solutions and provide technical mentoring</div><div>
Initiate design reviews for new applications while adhering to the software development standards.</div><div>
Crete design documents, architecture diagram and work with project/client team for defining technical solution</div><div>
Well-versed with the Agile methodology.</div><div>
Excellent verbal and written communication and collaboration skills to effectively communicate with both business and technical teams.</div><div>
Comfortable working in a fast-paced, result-oriented environment.</div></ul>
Required Skills
CLOUD DEVELOPER SQL APPLICATION DEVELOPER</div>

Java Lead Developer-4

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