Senior Software Engineer - Python


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About Quarkslab

Quarkslab is a French company specializing in information security R&D, consulting and software development. Our expertise is in combining offensive and defensive security to help organizations adopt a new security posture: Force the attackers, not the defender, to adapt constantly. Through our consulting services as well as our software we provide tailored solutions to organizations, helping them to protect their assets, sensitive data, and users against increasingly sophisticated attacks.

Quarkslab is an avid and active user of, and contributor to, Open Source Software and develops and maintains state-of-the-art security tools such as LIEF , QBDITritonIrma, and several other projects.

We develop two commercial software products: QFlow, a platform to automate and orchestrate security analysis of files at scale, and QShield, advanced code and data protection software to disrupt code lifting, reverse engineering and tampering attacks.

Job description

We are looking for an experienced Python Developer to help build the QFlow product, working in close collaboration with the product owners, Frontend, QA and the DevOps teams in an agile environment.

Key Responsibilities:

  • You would be building the QFlow platform focused on the backend services
  • Involved in architectural and design decisions that need to be taken on the platform
  • Contribute in peer reviewing team member's code
  • Define data models and API Specifications

What is QFlow?

QFlow is a scalable file analysis platform developed by Quarkslab. It is sold and used by Managed Security Services Providers (MSSPs) and end user organizations looking to make their malware detection and file security analysis processes more effective and more efficient.

It is built using state-of-the-art container orchestration and automation technologies and can be deployed on-premises or on the cloud, using modern DevOps tools.

QFlow features a web UI and REST API to ingest files, a scalable backed with authorization & authentication, file storage, and analysis automation and orchestration services, and a set of over 30 analysis engines, called "Probes", to perform various types of analysis workloads.

Why work at Quarkslab?

Work with an amazing team, eager to learn and play with new approaches and technologies, mixing various skills (security, compilation, program analysis, reverse engineering, software engineering). International environment with offices in Paris and Buenos Aires (team croissants vs. team asado), representations in Tokyo and Singapore.

  • Attend conferences in your field, learn from many internal events (weekly conference, trainings, research activities).
  • Contribute and support Open Source Software: Our own tools and other people's projects.
  • Flexible work hours, work from home.
  • Premium health insurance.

Recruitment process:

  1. Call with our Talent Acquisition Manager
  2. Video interview with QFlow Engineering Manager + Python Developer
  3. Video interview with CTO, QFlow VP & HR Manager
  4. HR debrief and job offer

QuarksLab is proud to be an equal opportunity workplace employer. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability or gender identity. If you have a disability or special need that requires accommodation, please let us know and we will be happy to accommodate.


The skills or knowledge we think you should have:

  • 5+ years experience in Python 
  • Have experience designing and architecting applications for cloud environments
  • Experience working with public cloud environments (Azure, AWS, GCP)
  • A good understanding of RESTful standards
  • Hands on experience with frameworks such as SQLAlchemy & Flask / Hug / Fast API
  • hands on experience with Docker & Kubernetes
  • Strong interpersonal and communication skills.
  • Fluent in English (written, spoken)

But also, it would be nice if you:

  • Experience with cloud services and building SaaS products
  • Have experience with malware analysis and threat intelligence software
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