Infrastructure IT - Security Engineer (Senior)

Security

Domaniewska 45, Warszawa

Webellian Sp.z o o

Full-time

B2B, Permanent

Senior

Hybrid

Tech stack

English

B2

Java

regular

Ajax

junior

ActiveX

junior

Job description

About Webellian

Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy.

About the opportunity

We are seeking an experienced Senior Infrastructure IT - Security Engineer to join our growing team. In this role, you will be responsible for identifying, assessing, and prioritizing vulnerabilities in client-side assets for both mobile and web applications. You will work with technologies such as JAVA, AJAX, and ActiveX to prevent backdoors and other attack vectors that could compromise applications. Your work will directly contribute to the security posture of our clients by designing effective testing strategies and providing actionable solutions.

Key responsibilities

As a Senior Infrastructure IT - Security Engineer, you will assess client-side assets for potential security vulnerabilities, focusing on web and mobile applications. You will identify attack vectors, analyze application technologies, and prioritize risks based on potential impact. You will collaborate with development and security teams to design and implement testing strategies, including mitigation plans for command injection risks and other common exploits. Additionally, you will document findings, provide recommendations, and contribute to improving the organization’s vulnerability management and application security practices.

Competencies

• Strong vulnerability assessment skills, with the ability to identify, assess, and prioritize risks

• Excellent problem-solving and analytical abilities to design effective testing strategies

• Knowledge of web and mobile application security, including technologies such as JAVA, AJAX, and ActiveX

• Experience identifying potential backdoors, injection points, and other attack vectors

• Strong verbal and written communication skills

• Ability to work independently and drive solutions in a complex environment

• Fluency in English (C1 preferred)

• 5+ years of relevant experience in functional analysis, application security, or vulnerability assessment

What we offer

• Contract under Polish law: B2B or Umowa o Pracę

• Benefits such as private medical care, group insurance, Multisport card

• There are English classes available

• Hybrid work in Warsaw (Mokotów)

• Opportunity to work with excellent professionals

• High standards of work and focus on the quality of code

• New technologies in use

• Continuously learning and growth

• International team

• Pinball, PlayStation & much more (on-site 🤫)

Join a growing team of dedicated professionals!

We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️

Please include the following statement: I hereby authorize Webellian Poland Sp. z o.o. to the process personal data provided in this document for realising the recruitment process pursuant to the Personal Data Protection Act of 10 May 2018 (Journal of Laws 2018, item 1000) and in agreement with Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016 on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC (General Data Protection Regulation).

Published: 14.08.2025

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