Web Developer / Application Security (AppSec) Engineer
ASSYST
We are seeking a Web Developer / Application Security (AppSec) Engineer with expertise in secure software development and application security. The ideal candidate will have experience implementing Secure SDLC (SSDLC), DevSecOps automation, vulnerability remediation, and protecting web applications against the OWASP Top 10. Responsibilities Secure web applications and REST APIs through SSDLC and DevSecOps practices, perform application security testing, remediate vulnerabilities, analyze security logs, and implement Web Application Firewall (WAF) and file integrity monitoring. Develop and support applications using REST APIs, SQL, .NET/C#, JavaScript, Python, Node.js, React, and TypeScript, while leveraging security tools including SIEM, IDS/IPS, EDR/NDR, and Wireshark. Preferred Qualifications Experience with federal cybersecurity frameworks, including NIST, FISMA, and FedRAMP. U.S. Citizenship is required due to the nature of the work performed in support of a federal agency. Certifications such as CSSLP, GWEB, CASE, OSWE, OSCP, Security+, GSEC, or equivalent. Strong Application Security and offensive security certifications are highly desirable. ASSYST is an Equal Opportunity Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, age, disability, military status, national origin or any other characteristic protected under federal, state, or applicable local law. #J-18808-Ljbffr ASSYST
- Ardent Management Consulting, Inc in Washington, DC is seeking a Web Developer Security Engineer to enhance the security of mission-critical web applications and cloud environments. This role entails integrating security throughout the software development lifecycle, remediating...Application
- ...government’s most critical national security and defense priorities, helping protect... ...begins. Ardent is seeking a Web Developer Security Engineer to join our team. This position is... ...the security of mission‑critical web applications, APIs, and supporting cloud environments...ApplicationLocal areaRemote workFlexible hours
$110k - $135k
...cybersecurity, and cutting-edge application development. We pride ourselves on... ...Reporting to the Program Manager, the Web Developer Embeds security across the SDLC for mission-... ...analysis, FIM, WAF management ~3+ Web AppSec / AppSec Engineering / SSDLC ~ Modern web tech incl....Application- ...of our clients. PositionTitle: Web Developer Security Engineer Location: US Congressional Budget... ...Protects CBOs mission-critical web applications, APIs, and sensitive data by... ...years in Web Application Security, AppSec, or secure SDLC (SSDLC). Development...ApplicationWork at officeLocal areaRemote work
$115k - $190k
...Job Description Job Description Web Developer Security Engineer Clearance Requirement: Public Trust (Tier 2) Location: Remote/Hybrid... ...is seeking a Web Developer Security Engineer to support application security initiatives across web applications, APIs, and...ApplicationRemote work- ASSYST is seeking a Web Developer / Application Security (AppSec) Engineer focused on secure software development and SSDLC execution. The role emphasizes DevSecOps automation, vulnerability remediation, and protecting web applications from OWASP Top 10 threats. The ideal...Application
- ASSYST, Inc. in Washington, DC is seeking a Web Developer / Application Security (AppSec) Engineer to build secure software and defend web applications from emerging threats. The role emphasizes implementing SSDLC, DevSecOps automation, vulnerability remediation, and protection...Application
- A government services contractor is seeking a Full Stack Web Developer to support enterprise-wide data initiatives. The role entails software application development, testing strategy development, and team collaboration to create integrated solutions. Candidates should...ApplicationFor contractors
- Web Application Developer - Mid Hybrid (first 60 days on-site then transitions to hybrid) Clearance: Top Secret (will be processed for SCI and... ...development standards, governance practices, and security guidelines. Communicate project status, risks, and technical...Application
- Job Overview Front End Developer - Senior Hybrid (first 60 days on... ...of modern, user‑focused web applications that support mission operations... ...with UX designers, backend engineers, and product teams to implement... ...role in delivering secure, scalable, and reliable front...Application
- ...Federal Services is seeking a seasoned Full Stack Developer to design and deliver end‑to‑end applications—from database to API to UI—within a classified government... ..., Terraform, GitLab, and DevSecOps practices in a secure, multi‑partition environment. #J-18808-Ljbffr...Application
- A government service provider based in Virginia is seeking a Full Stack Web Developer to enhance software applications within various teams. The ideal candidate will have 11 years of experience and a Bachelor's degree in a related field, showcasing expertise in JavaScript...ApplicationFlexible hours
- Upside is looking for an Application Security Engineer to enhance secure development practices and manage application vulnerabilities. You will work... ...teams to implement security best practices and evolve our AppSec program. The ideal candidate has 6+ years in application...ApplicationRemote job
$98.5k - $184.9k
A leading technology consulting firm is looking for a skilled UI/UX Engineer/Designer to enhance user interfaces for web applications. The ideal candidate will conduct user research and develop intuitive designs that meet accessibility standards. Responsibilities include...Application$62 - $73 per hour
Full Stack Java Developer (Senior) Rate: $62-73/hr (Can potentially flex for more senior level... ...deployment, and maintenance of enterprise applications within an Agile environment. This role will be responsible for building secure backend services, modern user interfaces,...ApplicationFlexible hours- Hopper is looking for a Senior Security Engineer to enhance its security posture by owning tooling, automation, and processes that secure applications throughout their lifecycle. This role involves building systems and working closely with engineering teams to make security...Application
$174k - $253k
Senior Security Engineer, AI/ML, National Security, Public Sector Job Level Mid Location and... ...development. Knowledge of open worldwide application security project (OWASP) for LLMs or... ...environment for Google's users and developers. Security Engineers work with network...ApplicationTemporary workWork at officeLocal areaRemote workWorldwide- Edgewater Federal Solutions in Washington, DC is seeking an Application Security Engineer who is an expert in cloud technologies and application... ...federal customers while driving the maturation of the agency's AppSec program. The ideal candidate will have experience in SAST/...ApplicationRemote job
- ...Ventures is seeking a Software Engineer to develop and maintain full stack software applications and services supporting AI/ML and... ..., or similar). Experience with web frameworks, relational and/or non... ...practices, design patterns, and secure coding principles. Experience...Application
- Okta is seeking a Staff Product Security Engineer in Washington to enhance security across AI-driven platforms. You will conduct offensive... ...information security with demonstrated abilities in AI security and application security, capable of mentoring teams and improving security...Application
$174k - $239k
Secure Every Identity, from AI to Human Identity is the key to unlocking... ...looking for a Staff Software Engineer that will join the Auth0... ...protection with minimum developer friction. Identity & Access... ...addition, Okta offers equity (where applicable), bonus, and benefits,...ApplicationPermanent employmentLocal areaWorldwideFlexible hours- ...Collaborate with a team of engineers to implement *** specific security policies in the CI/... ...SAST, DAST and SCA applications. Work with... ...to identify and develop automated security... ...at a code level in web and mobile applications... ..., Checkmarx, AppSec SE, Veracode, WhiteSource...ApplicationContract workWork experience placement
- Entarian seeks an experienced Senior Full‑Stack Development Lead to guide Agile software teams in delivering secure, scalable enterprise applications. You will steer architecture decisions and enforce best practices across multiple stacks, collaborating with federal leadership...Application
$140k - $160k
...Edgewater is currently seeking an Application Security Engineer who will be a hands-on... ...an exciting opportunity to develop the federal customer's... ...agency's Application Security (AppSec) program by defining... ...Professional (CSSLP) GIAC Web Application Penetration Tester...ApplicationContract workLocal areaRemote work- Responsible for leading application security engineering efforts, designing scalable security architectures... ...and code reviews. Collaborate with developers and DevOps teams to integrate... ...experience in Application Security, AppSec engineering, Cloud Security, or Software...Application
- ...Application Security Engineer Braintrust is the AI observability platform. By connecting evals and observability... ...or Rust ~ Deep knowledge of common web and API vulnerability classes and the... ...excited to push the frontier of how AppSec gets done with them ~ Clear...ApplicationFlexible hours
- ..., and the free world remains secure. Founded in 2024, Twenty Technologies... ...We are seeking IT Security Engineer to join our growing... ...across our network, systems, and applications, while working closely with... ...systems, VPNs, and DMZs. Develop and enforce security policies...ApplicationFull timeWork at officeFlexible hours
- Expression is looking for a Full Stack Developer to enhance our team in Washington, DC. This role requires proficiency in both front... ...back-end development, offering the chance to work on innovative applications. The ideal candidate should possess strong technical skills,...Application
- Leidos is seeking a Sr. Full Stack Developer in Bethesda, Maryland. This role involves designing, developing, and maintaining cloud systems and applications as part of an innovative team. Candidates should have significant experience in Java, Python, Agile practices, and...Application
$166k - $253k
...months, not years. ABOUT THE JOB We're seeking a Security Software Engineer to develop novel security tooling for securing embedded Linux systems... ...policy, please visit [ By submitting your application, you consent to Anduril Industries using a third-party...ApplicationFull timeWork experience placementImmediate start
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to Web Developer / Application Security (AppSec) Engineer. Be the first to apply!
- amazon web services engineer Washington DC
- remote junior web developer Washington DC
- content developer Washington DC
- remote entry level web developer Washington DC
- senior web developer Washington DC
- ecommerce web developer Washington DC
- angular web developer Washington DC
- web developer internship remote Washington DC
- remote contract web developer Washington DC
- entry level junior web developer Washington DC


