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Senior Penetration Tester

Stefanini Bucharest, Romania

remotefull-time
Posted Feb 9, 2026Apply by Mar 11, 2026

Role & seniority: Senior Penetration Tester / Ethical Hacker (5+ years)

Stack/tools: Web & mobile application security; server OS (Windows/Linux); network infrastructure; TCP/IP; scripting for automation; attacker-tactics/tools; certifications such as OSCP/OSWE/GPEN/CEH are a plus

Top 3 responsibilities

  • Hunt for vulnerabilities across diverse networks and applications

  • Simulate real-world attacks and assess client defenses

  • Translate findings into clear, actionable reports; collaborate with security team and clients

Must-have skills

  • Deep technical understanding of web/mobile apps, frameworks, databases, servers, and networks

  • Practical penetration testing experience (mobile, web, API, IT and network infra)

  • OS administration and security (Windows/Linux); TCP/IP knowledge; scripting for automation

  • Ability to stay current on security issues; English fluency

Nice-to-haves

  • Certifications (OSCP, OSWE, GPEN, CEH or equivalent)

  • Experience with diverse client bases in Romania and internationally

  • Strong analytical, detail-oriented problem-solving and self-driven learning

  • Location & work type: Romania-based; full-time; flexible hours with work-from-home options and project-aligned remote work; international projects and travel as needed

Full Description

Job Description

Description

The Stefanini Offensive Security Team is looking for a skilled ethical hacker to join our ranks. For years, we've been the first line of defense for our clients, protecting their critical data by thinking like an attacker. We thrive on uncovering vulnerabilities in complex IT environments and providing our clients with the clarity they need to stay secure.

What You'll Do

Hunt for vulnerabilities across diverse network systems and applications. Simulate real-world attacks to test client defenses. Work alongside a team of passionate security experts to solve complex challenges. Translate your findings into clear, impactful reports that drive change. You will be working with clients from various industries.

What You Bring

An unstoppable curiosity and a love for finding security flaws. The ability to work independently, but a preference for succeeding as a team. A proactive mindset and the drive to stay on top of the latest security trends. A collaborative spirit and a commitment to shared success. Experience working with a diverse client base both in Romania and internationally.

Key Requirements

Excellent technical understanding of various web & mobile applications, frameworks, database technologies, server technology, services, and network infrastructure, according to the scoping requirements. Solid experience with operating systems administration and security (Windows, Linux). Real cybersecurity experience in penetration testing of mobile and web applications, IT and network infrastructure, by safely utilizing the cyber attacker tools, tactics, and procedures. Good understanding of TCP/IP networking concepts. Experience with scripting for automation and exploit. Constant awareness of new security issues.

Relevant Certifications: OSCP, OSWE, GPEN, CEH, or similar represent an advantage. Experience in performing network, web, API, mobile penetration tests. Fluency in English.

Job Requirements

Desired profile

5+ years of relevant experience. Analytical, motivated, attention to details. Capable of solving complex issues. Self-driven, interested in reading technology articles and sharing his/her knowledge. Able to find the root cause of cybersecurity issues, exploiting and documenting it. Good time management skills.

What we offer

Being part of the Stefanini Offensive Security team, you will work with renowned experts in the cybersecurity field. Working within complex projects that are globally extended. Soft skills and technical training for current and emerging products and technologies.

Career development: opportunity to grow within the team. Special referral bonuses for recommending your friends. Private Medical subscription. A monthly budget for flexible benefits program that includes public transportation reimbursement and meal tickets, sport & wellness, telecom & electronics, children & parents, holiday & culture, tourism. Extra vacation days. Flexible working hours and work from home, aligned with project needs.

What's next?

It's best to apply today, because job postings can be taken down and we wouldn't want you to miss this opportunity.

In case you need further information, just send us a message at recruitmentEMEA@stefanini.com and we'll be happy to assist!

The preceding job description had been designed to indicate the general nature and level of work performed by employees within this classification. It is not designed to contain or be interpreted as a comprehensive inventory of all duties and responsibilities required of employees assigned to this job.

Diversity & Inclusion

Here at the Stefanini Group, we value plurality and equity, regardless of race, sexual orientation, disability, age, ancestry, religion, gender, and nationality. We understand and encourage the importance of being you!

About Us

We are the Stefanini group, a global tech consulting company of Brazilian origin that believes in the power of people to transform businesses through technology.

We are present in over 40 countries and operate with the purpose of co-creating solutions TOGETHER WITH OUR CLIENTS that accelerate results and improve the experience of people and organizations.

Here, we like to say that technology is not the end, but the means: what really matters are the people who drive it all.

Our mindset is AI First, meaning we invest in cutting-edge technology in everything we do, focusing on results for our clients.

We are a company, A GROUP, that breathes collaboration and offers a dynamic environment where you will learn by doing, grow alongside the team, and have space to contribute with ideas and projects.

More than just talking about digital transformation, we believe in real transformation that starts with people and impacts real businesses.

If you are looking for a place to develop, innovate, and be part of something bigger, the Stefanini Group is your place.

We want to inform you that there are currently scams targeting job seekers by falsely using our company's name, Stefanini. We sincerely apologize for any confusion or inconvenience this may have caused.

Please remember that legitimate job offers from Stefanini will always come through official channels, including direct communication with our trained recruiters. If you receive any unsolicited messages requesting payment or personal information, please disregard them.

If you suspect you've been targeted, please contact us immediately at RecruitmentEMEA@stefanini.com for verification.

Key Points to Remember

Legitimate job offers only follow interviews conducted with our hiring managers or clients. We will never ask for payment at any stage of the recruitment process.

Stay vigilant and feel free to reach out for verification. Your safety and security are our top priorities. Thank you for your understanding and cooperation.

Nivel de vechime Nivel mediu de experiență Tip de angajare Full-time Ocupație Tehnologia informației Sectoare de activitate Consultanță și servicii de afaceri

Penetration TestingVulnerability HuntingWeb Applications SecurityMobile Applications SecurityNetwork Infrastructure SecurityOperating Systems SecurityTCP/IP NetworkingScripting for AutomationExploit DevelopmentClient InteractionReport WritingOSCPOSWEGPENCEHAPI Penetration Testingmulti-location

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