68 sr security software engineer jobs at 39 companies in New Castle, DE
2mo
Save
Mark Applied
Hide
Sr. Software Engineer
Philadelphia or New Jersey or Delaware or New York or Maryland or Florida or South Carolina or Texas or Virginia or Georgia
HybridFull Time
FreedomPay: A fast-growing payments and commerce technology delivering secure solutions globally.
7+ YOE7+ years in application development and testing; strong web, SPA, and backend skills; security-focused; Agile experience; strong English communication.
.NET, SQL Server, MVC, jQuery, React, Angular, Redux, TypeScript, JWT, Git, HTML, CSS, Websockets
2w
Save
Mark Applied
Hide
Blockchain - Sr Lead Security Engineer
Plano or Seattle or Wilmington or Columbus or Jersey City or Palo Alto
$171k-$260k/yr OnsiteFull Time
7+ YOEBachelor's in CS or related,7+ years software development with ≥2 years blockchain experience, strong Java/Python skills, blockchain fundamentals, cryptography (MPC,TSS,DKG,ECDSA,EdDSA), AWS, containers, infra-as-code, API and security best practices.
Java/J2EE, Python, Spring Boot, Flask, FastAPIS, Multi-Party Computation (MPC), ECDSA, EdDSA, BIP-32/BIP-44, AWS EC2, AWS EKS, AWS Lambda, AWS S3, AWS RDS, AWS IAM, AWS SQS, AWS SNS, API Gateway, AWS KMS, Terraform, CloudFormation, Docker, Kubernetes, Oracle, PostgreSQL, DynamoDB, MongoDB, Redis, Datadog, Dynatrace, Splunk, Grafana, Prometheus, Jenkins, GitHub Actions, Spinnaker, GitHub Copilot, Claude Code, OAuth 2.0, JWT, TLS, mTLS
2mo
Save
Mark Applied
Hide
Software Engineer - Senior (contingent 045)
Aberdeen Proving Ground, Maryland, United States
OnsiteFull Time
7+ YOESenior software engineer with DoD experience, specializes in biometric systems, secure coding, and Agile/DevSecOps.
Android, CI/CD, DevOps, DevSecOps, Security, Encryption
2mo
Save
Mark Applied
Hide
Software Engineer - Senior (contingent 045)
Aberdeen Proving Ground, Maryland, United States
OnsiteFull Time
Systems Products and Solutions: Provides logistics and technical services to defense agencies.
7+ YOESenior software engineer with DoD biometric systems experience; security clearance required; Agile/DevSecOps; Android apps; cybersecurity.
Android, DevOps, DevSecOps, CI/CD, Security testing, Encryption
1mo
Save
Mark Applied
Hide
Senior Software Engineer
Arlington or Mount Laurel or San Diego or Fall River
$135k-$273k/yr HybridFull Time
7+ YOEBachelor's degree or equivalent, 7+ years software engineering experience, able to obtain/maintain Secret U.S. security clearance, experience leading/mentoring, expertise in SDLC, OOP, distributed systems, secure coding, testing, and integration.
SDLC, Service-Oriented Architecture (SOA), AI, Generative AI
4w
Save
Mark Applied
Hide
Senior Software Engineer
Aberdeen, Maryland, United States
$90k-$198k/yr OnsiteFull Time
10+ YOE10+ years software engineering experience in Defense, BA/BS or equivalent experience, proficiency with C++, Java, Python, C#, secure coding and Defense standards, DoD cybersecurity certification preferred.
C++, Java, Python, C#, Git, SVN, CI/CD, automated testing tools
1mo
Save
Mark Applied
Hide
Lead Software Engineer
Newark, Delaware, United States
$128k-$201k/yr OnsiteFull Time
6+ YOE6+ years software engineering experience building cloud and edge systems; experience in regulated environments, secure development practices, QMS familiarity, AI integration, Agile and version control proficiency; degree in CS/SE/STEM.
Microsoft Azure, Google Cloud Platform (GCP), Agile
2w
Save
Mark Applied
Hide
Distinguished Engineer - AI Security
Johnston or Pittsburgh or Irving or Phoenix or Franklin or Charlotte or Cleveland or Boston or Iselin or Philadelphia or Chicago
$175k-$250k/yr OnsiteFull Time
10+ YOE10+ years in software/platform/security/data engineering; strong Python and Linux scripting; AWS and cloud security experience; CI/CD and large-scale distributed systems expertise; bachelor's degree required.
Python, Bash, AWS, Linux, Jenkins, CircleCI, GitHub Actions, Kubernetes
1d
Save
Mark Applied
Hide
Software Engineer
Moorestown, New Jersey, United States
$80k-$97k/yr RemoteFull Time
Production experience with a major LLM platform, backend engineering in C#/.NET or Python, Azure, CI/CD, infrastructure as code, GitHub security, REST/OData APIs, and least-privilege access design.
C#, .NET, Python, Azure, Azure App Service, Azure Container Apps, Azure Functions, Azure Key Vault, Azure Managed Identity, GitHub Actions, Azure DevOps, Bicep, Terraform, OpenID Connect (OIDC), GitHub, Dependabot, OWASP Top 10, SAST, DAST, SCA, SLSA, REST, OData, MCP, Anthropic Claude, OpenAI, Google Gemini, AWS Bedrock, NIST AI RMF, NIST 800-53, CIS Controls, SIEM
1mo
Save
Mark Applied
Hide
Radio Services Software Engineer
Aberdeen Proving Ground, Maryland, United States
$150k-$174k/yr OnsiteFull Time
10+ YOEBachelor's in CS/SE (or equivalent experience), 10+ years software engineering with 3+ years on DoD communications, proficiency in C++, Java, or Python, secure coding and networking protocols knowledge, active DoD Secret clearance.
C++, Java, Python, VENOM, Agile, DevSecOps
3w
Save
Mark Applied
Hide
Principal Software Engineer
Moorestown, New Jersey, United States
$128k-$218k/yr OnsiteFull Time
8+ YOEAbility to obtain security clearance, 8+ years software development experience in real-time/embedded environments, proficiency with Java/C++/Python, Linux/UNIX, Agile, and IDEs such as Eclipse.
Java, C++, Python, Linux, UNIX, Eclipse, Clearcase, JIRA, xUnit, Junit, CPPUnitLite, UML
1mo
Save
Mark Applied
Hide
Senior Software Engineer
Lake Forest or Houston or Philadelphia
$124k-$207k/yr HybridFull Time
Strong software development in C# (.NET) or Node.js; hands-on Microsoft Azure cloud experience; CI/CD, DevOps, container experience; knowledge of cloud architecture, networking, and secure development practices.
Microsoft Azure, C#, .NET, Node.js, CI/CD
1mo
Save
Mark Applied
Hide
Experienced Software Engineer
Hazelwood or Plano or Oklahoma City or Ridley Park
$127k-$171k/yr OnsiteFull Time
5+ YOEBachelor's degree, 5+ years full-stack software development, 1+ year cloud experience (AWS/Azure/GCP), experience with SDLC and architecture frameworks, and ability to obtain U.S. security clearance (U.S. citizenship required).
AWS, Azure, GCP, CodeVue
1w
Save
Mark Applied
Hide
Senior Software Engineer
Berwyn, Pennsylvania, United States
HybridFull Time
7+ YOE7+ years backend engineering with Java/Python, 2+ years hands-on AI/ML, experience designing distributed transactional systems in regulated fintech, security/observability knowledge, and production incident handling.
Java, Python, Spring Boot, SQL, Kafka, Kubernetes, Docker, LangGraph, RAG, Vector Stores
2mo
Save
Mark Applied
Hide
Principal Software Engineer, Field Engineering
Aberdeen Proving Ground, Maryland, United States
$160k-$220k/yr OnsiteFull Time
5+ YOE5+ years hands-on software engineering; active Secret clearance; backend Go/Java/Rust; DevSecOps; Kubernetes; Bash/Python; Army-domain knowledge; customer-facing; Security+ readiness; willing to relocate to APG.
Go, Java, Rust, Kubernetes, Helm, CI/CD, Infrastructure as Code, Bash, Python, RMF
1mo
Save
Mark Applied
Hide
Experienced Software Engineer
Hazelwood or Plano or Oklahoma City or Ridley Park
$127k-$171k/yr OnsiteFull Time
5+ YOEBachelor's degree or equivalent, ability to obtain U.S. security clearance (Secret), 5+ years full stack development and SDLC/architecture experience, 1+ years cloud (AWS/Azure/GCP), strong communication and leadership.
AWS, Azure, GCP, CodeVue
4w
Save
Mark Applied
Hide
Cyber Software Engineer Senior
King of Prussia or Colorado Springs
$105k-$209k/yr HybridFull Time
5+ YOEBachelor's in a STEM field or equivalent, 5+ years cybersecurity/systems engineering experience, ability to obtain DoD Secret clearance, experience securing Linux/Windows, Ansible, vulnerability scanning, scripting, RMF and DevSecOps.
Linux, Windows, Ansible, Kubernetes, OpenShift, ArcSight
2mo
Save
Mark Applied
Hide
Sr. Full Stack Software Developer (Camden, NJ, US)
Camden, New Jersey, United States
$120k-$150k/yr OnsiteFull Time
10+ YOESenior-level full-stack developer with 10+ years in enterprise environments; strong C#, .NET, REST, front-end tech, SQL Server, security, and architecture leadership.
C#, NET Core, NET Framework, REST, Blazor, HTML5, CSS3, JavaScript, Bootstrap, SQL Server, OAuth2, OIDC, Azure AD/Entra ID, Git, CI/CD, Docker, CQRS
3w
Save
Mark Applied
Hide
Manager Software Engineering
Fort Washington, Pennsylvania, United States
OnsiteFull Time
10+ YOE5+ MgmtBachelor's or equivalent, 10+ years software engineering with 5+ years leading teams; experience with Java/JavaScript/Python, cloud, containers, CI/CD, DevOps, security, databases, and monitoring tools.
ServiceNow, Salesforce, Adobe AEM, Drupal, Unily, MuleSoft, Kyruss, Credential Stream, Azure, EPIC, Java, JavaScript, Python, Docker, Docker Swarm, Kubernetes, Spring Boot, Git, Azure DevOps, Jenkins, GitLab CI/CD, Elasticsearch, Logstash, Kibana, Splunk, SQL, NoSQL
1w
Save
Mark Applied
Hide
Senior Software Developer (Low Code/ No Code)
Aberdeen, Maryland, United States
$104k-$181k/yr OnsiteFull Time
5+ YOEUS citizen with active Secret clearance; bachelor’s degree with 5 years' software experience or 8 years' experience; proficiency in multiple programming languages; low code/no code integration experience; CI/CD and secure integration skills.
Python, C++, Java, C#, Go, Docker, Kubernetes, REST APIs