Junior Tooling Developer

pAs a Junior Tooling Developer, you will support the research and development of internal and external security tooling that enables advanced offensive engagements, defensive detection capabilities, and automation of cybersecurity workflows. You will work under senior engineers to build tools that advance Crimson7's offensive and defensive offerings. /p pThis role is ideal for someone with a strong technical foundation, an understanding of both offensive and defensive security principles, and an eagerness to learn and contribute to real security engagements. You will join our Solution Engineering and Development team, working alongside practitioners who deliver Red Teams, Managed Purple Teams, Managed Threat Hunting, and Detection Engineering to clients in finance, defence, and critical infrastructure. /p h3Responsibilities /h3 ul liDesign and implement RESTful APIs using ASP.
NET Core /li liDevelop and maintain business logic using the CQRS pattern (commands, queries, handlers, dispatcher) /li liWrite and manage database entities and migrations with .
NET Entity Framework /li liDevelop frontend features using Next.js (React) with the modern app router /li liImplement new UI components using the shadcn/ui component library /li liContainerize applications using Docker and Docker Compose /li liMaintain CI/CD pipelines with GitHub Actions for automated builds and deployments /li liParticipate in code reviews and follow conventional commit standards /li liContribute to internal knowledge bases and documentation /li liEnsure development follows secure coding practices and operational discipline /li liAuthor clear documentation and reports for technical teams and stakeholders /li /ul h3Requirements /h3 ul liStrong proficiency in C# and .
NET 9.0 /li liExperience building REST APIs with ASP.
NET Core /li liSolid understanding of Entity Framework and the queries it generates (DbContext, migrations, LINQ) /li liWorking knowledge of PostgreSQL or similar relational databases /li liExperience with the CQRS development pattern /li liExperience with React 18+ /li liExperience working in TypeScript /li liKnowledge of the shadcn/ui component library and Tailwind CSS /li liExperience with Docker containerization and Dev Containers /li liFamiliarity with CI/CD pipelines and GitHub Actions workflows /li liProficiency with Git version control and branching /li liAbility to read and interpret architectural documentation for developing a full-stack application /li liSolid problem-solving skills and a willingness to dig into technical challenges /li liGood communication skills and the ability to work in a team environment /li liProven capacity to learn fast, adapt to a changing startup environment, and take the leap into growth that may be demanding at the beginning /li /ul h3Nice to Have /h3 ul liFamiliarity with OWASP ASVS (4.0 or 5.0) and OWASP Cheat Sheets /li liFamiliarity with offensive tools such as Metasploit, Cobalt Strike, or custom C2 frameworks /li liComfortable using artificial intelligence to improve your workflow /li liFamiliarity with operating system internals (processes, memory, file systems) and the security implications of code behavior /li liExperience with coding languages such as C and C++ /li liComfortable using debuggers such as x64dbg /li liExposure to security frameworks such as MITRE ATTCK /li liUnderstanding of defensive detection tooling such as SIEM, EDR, or threat hunting frameworks /li liExposure to Purple Team or Red Team processes /li liExperience with cloud-native telemetry (Azure, AWS, GCP) /li liAcademic background in Computer Science, Cybersecurity, or a related field /li liOpen-source contributions to security products or published work /li /ul h3What

We Offer
/h3 pA junior developer at Crimson7 helps bridge the gap between cutting-edge threat research and practical tooling that clients use for security validation. You will learn from expert offensive and defensive practitioners while building real tools that contribute to high-impact security outcomes for organizations. /p ul liHands-on mentorship from senior offensive and defensive engineers /li liReal security tooling work that ships to client engagements /li liA fast-moving startup environment with room to grow /li liCompetitive salary and benefits /li liFlexible working arrangements for EU-based candidates /li /ul