Security Engineer, Bot Detection

About the role :

Help build and improve how we identify and manage automated traffic across our web and mobile products. You'll engineer detection and classification capabilities that distinguish AI-driven bots, other automation, legitimate bots, people, and unknown traffic—and help teams take proportionate action without disrupting genuine customers.

What you'll do :

• Build, test, and tune bot-detection signals and classification logic across web, mobile, APIs, and edge services
• Improve the telemetry used to understand bot activity, working with application and platform teams to close gaps in coverage, data quality, and attribution
• Maintain detection logic and configuration as production software: version changes, validate them against representative traffic, and use staged rollouts and rollback controls
• Measure detection coverage and quality, including precision, recall, unknown traffic, and false positives affecting customers and legitimate automated services
• Analyze changes in bot behavior, traffic patterns, and evasion techniques; turn findings into improved signals and detection tests
• Build monitoring and reporting that surfaces coverage gaps, material traffic changes, and detection quality for technical and business teams
• Work with product and service teams to translate detection results into proportionate decisions such as allow, monitor, challenge, restrict, or block
• Validate changes against business outcomes and customer impact, and continuously improve the detection capability based on results

Job Requirements

• Experience building or operating production software, security systems, or traffic-protection capabilities
• Strong coding skills in a language such as Python, Go, or Java, with experience testing and maintaining production systems
• Experience analyzing event or traffic data and developing detection logic, behavioral signals, or classification systems
• Understanding of web, mobile, API, or edge security and common automated-traffic and abuse patterns
• Ability to measure detection quality and balance security effectiveness against false positives and customer impact
• Clear communication skills and the ability to work across security, engineering, data, and product teams

Helpful experience :

• Bot management, web application firewalls, content delivery networks, or edge security controls
• Mobile app security signals, client-side challenges, or integration of security SDKs
• Statistical or machine-learning methods for classification, anomaly detection, or behavioral analytics
• Experiment design, traffic analysis, dashboards, or security reporting
• Abuse prevention, fraud detection, threat research, or incident response

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 [email protected] 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 [email protected] 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.