Full-Time

Security Engineer

Application Security

Posted on 9/3/2025

Welltech

Welltech

Develops mobile health and fitness apps

No salary listed

Madrid, Spain

In Person

Category
IT & Security (1)
Required Skills
Kotlin
Python
iOS/Swift
Requirements
  • 2+ years of experience in security engineering or a similar position
  • Hands-on experience in application security
  • Ability to explain complex security issues and their impact to diverse audiences
  • Experience with security vulnerabilities described in OWASP 10 and SANS 25
  • Experience with modern web application offensive security assessments such as penetration testing
  • Experience with securing mobile applications
  • Strong coding skills (preferable Python, Swift and/or Kotlin)
  • Proven problem-solving, analytical and investigative skills combined with the ability to develop creative solutions and navigate through ambiguity in a fast-paced, agile environment
  • Proven team player, collaborating well with others to tackle problems in a team-focused dynamic
Responsibilities
  • Implement automated security checks throughout the CI/CD pipelines (SCA, SAST, DAST, fuzzing, etc.)
  • Coordinate regular internal and external security assessments on new and existing products, such as penetration tests.
  • Perform threat modeling, design and code reviews sessions to proactively avoid identifying potential vulnerabilities
  • Build security libraries and tools both for the Security Team and for other teams
  • Maintain the vulnerability management process, ensuring that security risks are correctly addressed.
  • Work with the Security Champions program and conduct training sessions on secure development best practices
  • Propose and create new standards and tools to improve security posture of Welltech products
  • Provide security expertise while working across the company on critical security initiatives
  • Contribute to improving overall security of Welltech as a whole by participating in Security Team’s initiatives
  • Support Security team in fostering security culture and designing awareness campaigns
Desired Qualifications
  • Previous experience with Bug Bounties, CTFs or similar activities
  • Experience with implementing security across a microservices architecture
  • Experience with technologies such as Docker and Kubernetes
  • Experience with the AWS environment
  • Experience with PCI certification process

Welltech is a global health and fitness tech company with Ukrainian roots that builds mobile apps focused on wellness. The company offers a suite of apps for fitness tracking, weight loss programs, yoga instruction, and intermittent fasting guidance. Users access core features via free apps and pay for premium content through in-app purchases or subscriptions, enabling personalized plans and enhanced content. The products run on mobile devices and are designed to be easy for individuals to use on their own, with revenue coming from direct-to-consumer subscriptions and purchases. Welltech differentiates itself by growing organically without external funding, expanding through multiple European hubs (five centers) and maintaining a sizable global user base with over 220 million installs. Its goal is to help people improve their health and fitness by delivering accessible, scalable wellness tools that people can use anytime, anywhere.

Company Size

N/A

Company Stage

N/A

Total Funding

N/A

Headquarters

N/A

Founded

N/A

Simplify Jobs

Simplify's Take

What believers are saying

  • Organic growth sustains 753 employees and $25.5M revenue.
  • UK entity diversifies into electromedical equipment manufacturing.
  • Apps foster healthy habits for millions of users worldwide.

What critics are saying

  • MyFitnessPal erodes subscriptions via Under Armour cross-promotions.
  • Apple Fitness+ locks iPhone users with HealthKit exclusivity.
  • Google Fit undercuts $9.99/month with free Gemini AI.

What makes Welltech unique

  • Welltech bootstrapped to $25.5M revenue without external funding.
  • Portfolio exceeds 220 million installs across six apps.
  • Operates hubs in US, Ukraine, Poland, UK, Spain.

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Benefits

Wellness Program

Professional Development Budget

Performance Bonus

INACTIVE