Senior Application Security Researcher

CommIT; Buenos Aires; On-site; ARS 91,242,000 - 182,485,000; Full time

Job summary

CommIT in Buenos Aires is seeking a senior, hands-on Application Security Researcher to advance modern AppSec. You'll collaborate with engineers, researchers, and AI/data scientists on next-generation detection, including autonomous, agentic pen-testing capabilities; this is a build-and-break role, not a typical AppSec position.

You will bring 5+ years in offensive security, deep web/app vulnerabilities knowledge, and strong coding in Python or Go, delivering production-quality code while

Qualifications

• 5+ years hands-on in offensive security, vulnerability research, or application security.
• Deep understanding of web application and API vulnerabilities, including business-logic flaws.
• Strong coding in Python or Go with production-ready code.
• Experience building or tuning detection logic (SAST, DAST, SCA, secrets, or custom rule engines) and reducing false positives.
• Solid grasp of modern stacks: CI/CD pipelines, containers, Kubernetes, and at least one major cloud provider.
• Hands-on use of LLMs / AI models for security tasks, with the judgment to measure where they help and where they fail.
• Comfort with large datasets (SQL, BigQuery, or similar) to drive research and measure detection accuracy.
• Takes research ideas from prototype to production with minimal guidance.
• Clear written communication — can explain a complex attack path to engineers and product managers.

Skills

Offensive security

Web/API vulnerabilities

Python or Go

Detection logic (SAST/DAST/SCA)

CI/CD, containers, Kubernetes, Cloud

LLMs/AI for security

Large datasets (SQL/BigQuery)

Prototype to production

Technical writing

Education

M.Sc. in Computer Science or Cyber Security

Tools

SAST tools

DAST tools

SCA tools

CI/CD tooling

BigQuery

Kubernetes

Cloud providers (AWS/GCP/Azure)

Job description

The company secures the AI-driven SDLC from prompt to production, unifying development and cloud context to stop vulnerabilities at the source. The Security Research group is hiring a senior, hands-on Application Security Researcher to push modern AppSec forward — working with engineers, researchers and AI/data scientists on next-generation detection, including autonomous, agentic pen-testing capabilities. This is a build-and-break role, not a typical AppSec position.

Must-have skills:

• 5+ years hands-on in offensive security, vulnerability research, or application security


• Deep understanding of web application and API vulnerabilities, including business-logic flaws and multi-step attack chains


• Strong coding in Python, Go, or similar, with production-quality code shipped


• Experience building or tuning detection logic (SAST, DAST, SCA, secrets, or custom rule engines) and reducing false positives


• Solid grasp of modern stacks: CI/CD pipelines, containers, Kubernetes, and at least one major cloud provider


• Hands-on use of LLMs / AI models for security tasks, with the judgment to measure where they help and where they fail


• Comfort with large datasets (SQL, BigQuery, or similar) to drive research and measure detection accuracy


• Takes research ideas from prototype to production with minimal guidance


• Clear written communication — can explain a complex attack path to engineers and product managers


• M.Sc. in Computer Science, Cyber Security, or a related field

Nice to have:

• Published research, CVEs, conference talks, or a bug bounty track record


• Experience building AI agents or evaluation frameworks for LLMs


• Background in exploit development, red teaming, or penetration testing


• Code analysis techniques (taint analysis, call graphs, reachability)


• Contributions to open-source security tools