Senior Software Engineer

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Senior Software Engineer in Others

NielsenIQ
Full time
Email

Others
09/18/2026
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Barcelona, Spain

Responsibilities

Design and build scalable distributed scraping architectures for thousands of domains.
Reverse engineer APIs and mobile applications using Frida, mitmproxy, Charles Proxy, Burp Suite, and similar tools.
Detect and handle anti-bot measures, JavaScript challenges, browser behavior detection, fingerprinting, and WAFs.
Lead technical innovation by identifying edge cases, prototyping approaches, and sharing knowledge.
Set up anomaly detection and monitoring to identify scraping blockers and failures early.
Handle proxies, session management, cookie injection, and TLS tuning across scraping workloads.

Requirements

At least 5 years of experience with Python and large-scale scraping projects.
Deep understanding of anti-bot technologies, fingerprinting, WAFs, JavaScript challenges, and bypass techniques.
Experience with Scrapy, Requests, httpx, Selenium, Playwright, or custom headless browser drivers.
Strong debugging skills across browsers, HTTP traffic, and device-level interactions.
Familiarity with Parquet, Avro, or real-time stream processing.
Knowledge of MongoDB, InfluxDB, and Redis, including optimization.
Bonus experience with real-device simulation, distributed task queues such as Celery and Kafka, high-security or mobile-first platforms, Linux, AWS, GCP, Kubernetes, Cloud Run, and Cloud Functions.
Ability to work independently on novel technical problems.

Benefits

Flexible working environment and flexible hours.
Volunteer time off.
LinkedIn Learning.
Employee Assistance Program.
Competitive salary and opportunities for rapid growth.
Ownership and freedom to experiment within a global, innovation-focused team.

Salary: Competitive

NielsenIQ

NielsenIQ is a top consumer intelligence company that provides in-depth insights into consumer buying behavior, helping businesses identify new growth opportunities. With the recent merger with GfK, NIQ offers an unmatched global reach and advanced analytics that deliver a comprehensive understan...

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