Cyber Security Analyst (US team)
At a glance
Mid-level Security Operations & Analysis role at Sigma Software. Remote, Brazil · full-time.
Pay not stated Security Operations & Analysis salary
remoteroles summary, based on the employer's posting.
What you'll do
- Analyze client web traffic and logs to uncover malicious patterns, then investigate attacks and limit false positives
- Build and refine detection methods as online threats change, working with research and R&D colleagues
- Respond to customer incidents in real time and prepare clear reports explaining what happened
- Plan internal automation work that makes the team more efficient
- Support global customers on a rotating shift schedule that includes weekends
What you bring
- At least three years analyzing data in cybersecurity or fraud detection, including work with logs and dashboards
- Strong SQL ability, including complex queries, aggregations, window functions, CTEs and subqueries
- You understand web traffic and client-server basics, including HTTP, APIs and basic HTML or JavaScript
- You have worked with SIEM systems and can troubleshoot technical problems effectively
- You communicate professionally with customers and have strong English skills
Who this fits
This role suits an analyst who can investigate traffic data, explain findings to customers, and work with technical teams on detection improvements. The schedule rotates across shifts and includes weekends.
From the employer
We're seeking motivated, sharp-minded professionals to join our team as a Cyber Security Analyst/Researcher. In this role, you'll collaborate directly with clients, examine traffic patterns, and play a key part in identifying and neutralizing harmful bots and online threats.
Why join us? If you're passionate about cybersecurity and eager to make the internet a safer place, this is your chance to make a meaningful contribution.
CUSTOMER
Our client delivers advanced cybersecurity solutions designed to protect organizations, users, and digital ecosystems from evolving online threats. The company specializes in bot defense and anti-malvertising technologies for the AdTech industry, supporting SSPs, DSPs, agencies, and publishers through scalable protection platforms, customizable reporting tools, and API integrations.
PROJECT
The project focuses on real-time threat detection and bot mitigation for enterprise-scale clients. Cyber Security Analysts collaborate directly with customers, leveraging advanced analytics platforms to identify malicious traffic patterns and neutralize online threats. This dynamic environment requires both technical expertise and strong communication skills.
- Investigate advanced and persistent attacks using data analysis and data science tools
- Analyze customers' web traffic to detect unidentified threats and reduce false positives using Elasticsearch and BigQuery
- Research, design, and continuously enhance detection mechanisms to stay ahead of evolving threats
- Provide real-time technical support to global customers, delivering professional and timely incident responses
- Produce clear, insightful incident reports
- Collaborate cross-functionally with R&D and Research teams to optimize the company's detection and mitigation capabilities
- Design, plan, and implement internal automation projects to improve team efficiency
- Work in a shift-based schedule, including weekends
- At least 3 years of experience in data analysis in cybersecurity or fraud detection domains, including experience with logs and dashboards
- Strong SQL skills: complex queries, aggregations, GROUP BY, ORDER BY, filters, window functions (e.g., RANK()), CTEs, and subqueries
- Technical understanding of web technologies and client–server architecture (APIs, HTTP, basic HTML/JavaScript)
- Experience working with web traffic data, including HTTP traffic, logs, request analysis, and traffic pattern investigation.
- Experience with SIEM systems (experience with the Elastic Stack would be an advantage)
- Strong troubleshooting and problem-solving skills
- Experience in customer support, including direct communication with clients; professionalism and politeness are essential
- Strong English communication skills
WOULD BE A PLUS
- Experience in a Cybersecurity Analyst/Researcher role, ideally supporting external customers in threat detection and response, providing web application security, bot management, fraud detection.
- Experience with research methodologies (hypothesis testing, verification and research plan)
- Python and JavaScript knowledge
- Experience with BigQuery/Snowflake
- Proficiency in building dashboards using BI tools (Snowflake, Looker, Kibana, JSM)
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