Senior Application Security Engineer (Java/TypeScript/JavaScript)

First Line Software • Serbia

Relocation

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AI Summary

Lead application security initiatives by evaluating business requirements, performing deep security assessments, and guiding secure coding practices. Conduct source code reviews, penetration testing, and secure API hardening across modern web stacks. Collaborate with development teams to remediate vulnerabilities and enforce security best practices in Java, TypeScript, and JavaScript environments.

Key Highlights

Mandatory relocation to Belgrade (Serbia) or Valencia (Spain) with relocation support provided

Focus on secure coding, penetration testing, and application security for Java/TypeScript/JavaScript

End-to-end security assessments for modern web applications, APIs, and distributed systems

Key Responsibilities

Evaluate business requirements and review software architecture through a security lens

Perform in-depth source code reviews, static (SAST), and dynamic (DAST) security testing

Plan and execute penetration testing across applications and systems

Partner with development teams to remediate vulnerabilities and strengthen secure coding practices

Apply deep expertise in secure code review for Java, TypeScript, and JavaScript

Perform security assessments across the full web stack, including frontend frameworks, middleware, and backend APIs

Review and harden API designs, authentication flows, session management, and data exchange patterns

Assess and secure API management platforms, ensuring proper authentication, authorization, rate-limiting, and policy enforcement

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Technical Skills Required

Java TypeScript Application Security

Benefits & Perks

Relocation support provided

Opportunity to work with modern technologies and attend training/conferences

Comfortable office environment with unlimited coffee and snacks

Organized leisure activities, events, and sports support

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Nice to Have

Experience with C# or C++

Experience securing modern web applications and APIs

Collaborative mindset with ability to explain security concepts to development teams

Job Description

About the Company

First Line Software works with some of the world's top businesses and organizations in industries like healthcare, data engineering, warehouse automation, retail digitalization, mobile app development, and e-commerce. Our projects are as varied as our people, and our people are as talented as they come. We prefer working as a transparent and supportive team, who shares our knowledge as well as our success.

Let's see what we can create together.!

The relocation to Belgrade (Serbia) OR Valencia (Spain) is mandatory, Relocation support will be provided by company.

What you will do:

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