---
title: 'Senior Platform Security Engineer (d/f/m) at Taxfix'
canonical: 'https://feeny.ai/job/senior-platform-security-engineer-d-f-m-taxfix-berlin-z025e1fbeb1v'
type: 'job'
last_seen: '2026-09-07'
---

# Senior Platform Security Engineer (d/f/m) at Taxfix

- **Company:** Taxfix
- **Location:** Berlin, Germany
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-28
- **Last confirmed live:** 2026-09-07
- **Apply:** https://jobs.ashbyhq.com/taxfix.com/714bb792-fece-40cb-88c4-661d0fe6ba35

## Job description

## OUR STORY:

Every year millions of people are either filing their taxes in fear or giving up on their tax refund altogether. We're working on fixing that. Our intuitive app enables anyone, regardless of education or background, to file their taxes with newfound confidence.

Spread across Germany, Spain and the UK, the team at Taxfix Group with its brands Taxfix, Steuerbot and TaxScouts, is a compassionate group of solution-finders. We speak our minds openly, and with over 400 professionals, including tax experts, developers, and IT security experts, we're rich in ideas and voices. The group has facilitated more than 3.5 billion euros in tax refunds for its customers since its founding in 2016.

## YOUR CHALLENGE:

We are seeking an experienced Senior Platform Security Engineer to design, implement, and maintain security solutions for our cloud-native infrastructure and AI systems. This role will be responsible for securing our platform across multiple cloud environments, ensuring container and Kubernetes security, protecting AI/ML workflows, and implementing robust security controls throughout our SDLC. The ideal candidate will have deep technical and programmatic expertise in cloud-native security, along with demonstrable hands-on experience securing AI/ML systems.

## YOUR RESPONSIBILITIES AND DECISIONS:

## CLOUD & INFRASTRUCTURE SECURITY

- Design and implement comprehensive security architectures for cloud platforms (AWS, Azure, GCP)
- Implement security best practices for container and Kubernetes deployments
- Develop and maintain secure Infrastructure as Code (IaC) codebases
- Design and deploy zero-trust network architecture and secure service mesh solutions
- Build and maintain secure CI/CD pipelines following DevSecOps principles

## AI/ML SECURITY

- Secure AI-powered product features end to end, covering context assembly, tool invocation, and output handling
- Design and review security controls for RAG implementations
- Secure agentic solutions and their extension points: tool integrations (MCP clients and servers), agent skills, and autonomous action boundaries such as scoped credentials, sandboxing, and human-in-the-loop gates
- Build defenses against direct and indirect prompt injection and other adversarial inputs to LLM applications
- Establish data security controls for sensitive data flowing through inference, retrieval, and fine-tuning

## SECURITY OPERATIONS

- Lead incident response for cloud and AI infrastructure security incidents
- Develop and implement security monitoring and detection strategies
- Conduct threat modeling and risk assessments for cloud-native and AI systems
- Perform regular security assessments of cloud infrastructure and container deployments
- Create and maintain security documentation, including policies, procedures, and run-books

## LEADERSHIP & COLLABORATION

- Collaborate with development, data science, and operations teams to integrate security
- Communicate security requirements and recommendations to technical and non-technical stakeholders
- Stay current with emerging threats and security trends in cloud-native and AI security
- Participate in technology selections for security tooling and platforms

## YOUR PROFILE:

## EXPERIENCE

- 5+ years of experience in information security, with at least 3 years specializing in cloud security
- 3+ years of hands-on experience securing containerized environments (Docker, Kubernetes)
- Demonstrable hands-on experience securing AI/ML or LLM-based systems
- Strong background in at least one major cloud provider (AWS, Azure, GCP)

## TECHNICAL SKILLS

- Expert knowledge of container security, Kubernetes security, and cloud-native security patterns
- Proficiency with Infrastructure as Code tools (Terraform, CloudFormation, etc.)
- Strong understanding of network security, identity management, and access control
- Experience with security tooling for cloud environments (Cloud Security Posture Management, CSPM)
- Working knowledge of AI/ML and LLM security, including familiarity with frameworks like TensorFlow and PyTorch and their security implications
- Proficiency in scripting and programming languages (Python, Go, Bash)
- Experience with security automation and orchestration

## PREFERRED EXPERIENCE

- Deep experience securing Large Language Models (LLMs) and generative AI systems
- Familiarity with AI/LLM security frameworks (e.g., OWASP LLM Top 10) and AI governance or compliance requirements
- Experience with secure multi-tenant AI infrastructure
- Experience with privacy-enhancing technologies for AI/ML (differential privacy, federated learning)
- Contributions to open-source security projects or public security research
- Experience building security tools or automation frameworks

WHY TAXFIX?

- A chance to do meaningful, people-centric work with an international team of passionate professionals.
- Holistic well-being with free mental health coaching sessions.
- A monthly allowance to spend on an extensive range of services that you can use and roll over as flexibly as you like.
- Employee stock options for all employees—because everyone deserves to benefit from the success they help to create.
- 30 annual vacation days and flexible working hours.
- Work from abroad for up to six weeks every year. Just align with your team, and then enjoy your trip.
- Plenty of opportunities to socialise as a team. In addition to internal tech meetups, our international team hosts regular get-togethers—virtually and in person when possible.
- Free tax declaration filing, of course, through the Taxfix app—and internal support for all personal tax-related questions.
- Have a four-legged friend in your life? We’re happy to have dogs join us in the office.

Excited? So are we. Learn more about Team Taxfix https://medium.com/taxfix on our blog and get a glimpse of our culture.

At Taxfix, we believe that incredible things happen when you have a wealth of perspectives and experiences. We're proudly committed to equal employment and development opportunities no matter your gender, race, religion, age, sexual orientation, colour, disability, or place of origin. To help mitigate any potential unconscious biases, we ask that you refrain from including your picture, age, or marital status on your CV. Let your experiences speak for themselves.

Not sure if you meet all the requirements for this role? Please apply anyway. You might bring something special to the team that we hadn't considered previously.

## About Taxfix

## Company Overview
- **One-liner**: Taxfix is Europe’s leading AI-native digital tax platform that simplifies tax filing for individuals across Germany, the UK, and Spain.
- **Entity Type**: Private (Late Stage) – Over €330 million in total funding from top-tier investors.
- **Headquarters**: Berlin, Germany (with offices in Madrid, London, Fellbach/Stuttgart, and Tallinn)
- **Founded**: 2016
- **Founders**: Not publicly available in provided sources (CEO Martin Ott and CPO Mohamed Omaizat lead the company)

## Core Business
- **Primary industry**: Fintech / Digital Tax Solutions
- **Target customers**: B2C – individuals, employees, students, parents, and freelancers who need help filing taxes.
- **Mission/purpose**: “Enable financial participation for everyone” and “fix finance for all” – making tax filing simple, accurate, and stress-free.

## Products & Services
- **Taxfix Platform (Self-Service & Assisted)**: A mobile and web application that uses AI and real tax experts to guide users through filing their tax returns. In Germany, users can file fully DIY or with expert assistance; in the UK and Spain (formerly TaxScouts, now rebranded to Taxfix), the service connects users with accredited accountants. The platform is designed to adapt to different life moments and local tax complexities.

## Market Standing
- **Valuation**: Not disclosed
- **Key Metric**: Total funding of over €330 million (as of 2025) [[taxfix.de](https://taxfix.de/en/about-us/)]
- **Notable Investors**: Index Ventures, Valar Ventures, Creandum, Redalpine, OTPP (via TVG) [[taxfix.de](https://taxfix.de/en/about-us/)]
- **Growth Signals**:
  - Over 8 million tax submissions handled across Germany, the UK, and Spain [[taxfix.com](https://taxfix.com/en-uk/about/)]
  - Over €4.5 billion recovered for customers [[taxfix.de](https://taxfix.de/en/about-us/)]
  - Rated “Excellent” (4.8/5) from 6,500+ Trustpilot reviews [[taxfix.com](https://taxfix.com/en-uk/about/)]
  - 400+ employees across five offices [[taxfix.de](https://taxfix.de/en/about-us/)]
  - Rebranded TaxScouts to Taxfix in 2024/2025, unifying the brand across Europe [[taxfix.com](https://taxfix.com/en-uk/about/)]
  - Clear path toward profitability, backed by strong investor confidence [[taxfix.de](https://taxfix.de/en/about-us/)]

## Competitive Advantages
- **AI-native technology**: AI is embedded in the core product and operations, not an add-on, enabling scale and personalization.
- **Hybrid human + AI model**: Combines intelligent automation with a network of 150+ accredited accountants, ensuring accuracy and trust.
- **Pan-European presence**: Operating in three major markets (Germany, UK, Spain) with localized solutions, giving a scale advantage over local-only competitors.
- **Strong brand and user trust**: High ratings and millions of filings create a virtuous cycle of credibility and word-of-mouth growth.
- **Deep investor backing**: Over €330M in funding from top VCs provides a long runway and resources for expansion.

## Strategic Focus
- Continue scaling across Europe, leveraging AI to improve product efficiency and user experience.
- Unify the brand under Taxfix after the TaxScouts rebrand, strengthening market position in the UK and Spain.
- Drive toward profitability while maintaining growth and investing in technology.
- Expand the assisted product offering and deepen partnerships with accountants and financial institutions.

## Why Work Here
- **Culture**: Open, inclusive, and collaborative. Employee Resource Groups include the Lavender Circle (LGBTQ+) and Women at Taxfix. The company actively embeds diversity, equity, inclusion, and belonging into the employee journey [[taxfix.de](https://taxfix.de/en/careers/)].
- **Work model**: Hybrid setup – employees can choose remote or work from vibrant offices in Berlin, Madrid, London, Fellbach/Stuttgart, or Tallinn. 30 days of annual working abroad + 30 days of annual vacation allowance [[taxfix.de](https://taxfix.de/en/careers/)].
- **Professional development**: Annual learning budget, unlimited LinkedIn Learning access, workshops, and training tailored to individual goals [[taxfix.de](https://taxfix.de/en/careers/)].
- **Compensation & ownership**: All employees receive a stake in the company through a Virtual Stock Option Plan (VSOP) [[taxfix.de](https://taxfix.de/en/careers/)].
- **Wellbeing**: Mental health resources, wellness sessions, and up to 10 free therapy sessions per year via Nilo [[taxfix.de](https://taxfix.de/en/careers/)].
- **Impact days**: Two paid days per year for volunteering with causes employees care about [[taxfix.de](https://taxfix.de/en/careers/)].
- **Onboarding**: A four-day program introducing new joiners to the mission, culture, and ways of working [[taxfix.de](https://taxfix.de/en/careers/)].
- **Company language**: English is the official company language, making it accessible to international talent [[taxfix.de](https://taxfix.de/en/careers/)].

## Sources
1. [taxfix.de - Careers](https://taxfix.de/en/careers/)
2. [taxfix.de - About Us](https://taxfix.de/en/about-us/)
3. [taxfix.com - About (UK)](https://taxfix.com/en-uk/about/)
4. [LinkedIn - Taxfix SE](https://de.linkedin.com/company/taxfix)
5. [jobs.ashbyhq.com - Taxfix Open Positions](https://jobs.ashbyhq.com/taxfix.com)

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