Senior Python Engineer

Job description

Senior Python Engineer

Ready to embark on the quest of joining Hack The Box?

At the end of this thrilling journey, you'll become a proud member of Hack The Box, with the ultimate mission to help redefine cybersecurity expertise.

Core Mission of the Senior Python Engineer

The Senior Software Engineer will be the newest addition to the software & data engineering team, working on the latest HTB products.

They will be responsible for writing backend code and executing the roadmap of the platform, building projects from scratch while maintaining existing products.

It is expected to follow best practices in software development, while familiarizing with HTB practices.

Location & Working Model

• Europe/Greece
• Choose between fully remote work across Europe or relocating to our Athens Tech Hub with relocation support.
  
  

Fully Remote / Hybrid (2 days in the office, 3 days remote, plus one month of work from anywhere).

If only in Greece: When hiring in Greece, we’re open to candidates from all locations.

Those based within 55 km of our Athens office will follow a hybrid work model.

For candidates located beyond that radius, a fully remote arrangement is available.

• We offer a 10% relocation bonus on the annual salary to support your move.
  
  
• In addition, you would benefit from a 50% tax reduction on your income as part of the relocation.
  
  
• We’ll support you with accommodation during the first few weeks.
  
  

Fellowship You’ll Be Joining

The Software Engineer will join our software & data engineering team, the driving force behind Hack.

You'll collaborate closely with AI Engineers, Data Engineers, and cross‑functional partners across SRE and Product.

Our wider AI organization spans Analytics, Data Engineering, and AI teams, and has already delivered industry‑first innovations, including the cybersecurity sector's first MCP server and our AI Range platform for training autonomous agents.

The Research & Development organization, encompassing Analytics, Data Engineering, and specialized development teams, is a leader in innovation.

Our contributions include industry firsts, such as the cybersecurity sector's initial MCP server and our specialized platform, designed for advanced technical training.

You will have a direct impact on the backend code of our newest products.

Interesting Resources You Should Check

• HTB launches the world’s first AI Range
• Introducing the MCP Server for CTF competitions at Hack The Box

Adventures That Await You

• Design, develop, maintain, and evolve backend services, including ownership of existing systems and delivery of new features
• Lead greenfield projects, designing and building backend systems from scratch with scalability and reliability in mind
• Own backend architecture and technical design, making informed decisions to support long‑term growth and stability
• Develop and maintain REST APIs using modern frameworks like Django, FastAPI, or similar, and manage data storage and retrieval across multiple systems
• Collaborate closely with Product Managers to translate product requirements into well‑designed technical solutions, and act as the go‑to person for platform integrations
• Implement and maintain CI/CD pipelines, participate in system monitoring, performance tuning, production support, and contribute to internal documentation and knowledge sharing

Skills, Knowledge, and Experience

• 5+ years of professional software engineering experience, with a strong focus on backend systems and production ownership
• Strong proficiency in Python with hands‑on experience building services using FastAPI
• Proven experience designing and operating backend systems, including REST APIs, PostgreSQL, Elasticsearch, and event‑driven architectures (Kafka or similar)
• Deep understanding of backend architecture, scalability, and distributed systems, with the ability to design systems end‑to‑end
• Production experience with CI/CD and cloud‑native infrastructure, including Kubernetes and Terraform
• Experience with Django and Fastapi
• Experience with ClickHouse
• Familiarity with MCP and Fastmcp
• Exposure to AI and related technologies
• Experience in high‑growth or startup environments

What Your Hack The Box Adventure Will Have in Store

• You have the exhilarating opportunity to contribute to a product that is highly appreciated by users and the cybersecurity community at large.
  
  
• You’ll experience a highly supportive and caring environment, fostering growth, flexibility, and autonomy.
  
  
• You’ll embark on an exciting journey of continuous learning and problem‑solving, levelling up as our organisation grows.
  
  
• Most importantly, you’ll have a blast at HTB because fun is an essential ingredient in our recipe for success! Just wait until you see our global meet‑ups.
  
  

Benefits

• Paid paternity leave
• 25 annual leave days
• Free lunch & snacks at the office
• 120€ Ticket Restaurant by Edenred
• Dedicated budget for training and professional development, participation in conferences
• Full access to the Hack The Box lab offerings; so you can learn how to hack
• State‑of‑the‑art equipment (mac, iPhone, and mobile plan)
• Flexible WFH (Hybrid Model) – Fully Remote is also an option if you're not an Attica resident
• Annual childcare allowance to support daycare expenses for parents
• Access to on‑site gym and a variety of group activities including Cross Training, Pilates, Boxing and Climbing

The Quest of Becoming Hack The Box’s Senior Python Engineer

• Level 1: Submit your application.
  
  
• Level 2: Meet the Talent Acquisition team.
  
  Highlight your past achievements, ambitions, and values.
  
  
• Level 3: Meet the hiring team.
  
  Connect with the hiring team and share your achievements.
  
  
• Level 4: Complete an assignment that aligns with day‑to‑day job‑related tasks and responsibilities.
  
  Part of the assignment is discussing it with the hiring team in a debriefing session, to walk the team through your thinking process.
  
  
• Level 5: You've officially received an offer from HTB! To complete the last level and the Quest, accept the offer.
  
  

Hack Your Career, Today

Join us in this epic adventure of cybersecurity at Hack The Box!

ABOUT HTB

Hack The Box (HTB) is the cybersecurity upskilling and talent development platform trusted by individuals, enterprises, and government agencies to sharpen offensive and defensive capabilities.

Powered by a vibrant global community and hands‑on, real‑world training, HTB helps security teams practice like attackers, validate skills continuously, and move faster against emerging threats.

We’re scaling rapidly across the enterprise market—especially in Financial Services, MSSPs, and Technology—and we’re just getting started.

If you’re excited to turn technical depth into crisp stories, to shape a category, and to fuel measurable growth in a fast, collaborative environment—come build with us.

Get the most important updates on HTB’s latest year! We are super proud to share that Hack The Box’s entities in the US, the UK & Greece have been certified as a Great Place to Work (2024‑2026).

Furthermore, Hack The Box’s Greek entity has been listed by the Great Place to Work Institute in the Top 5 of Best Workplaces for three consecutive years (4nd, 2nd, 3rd).

On the European level, the Greek entity has been listed as Best Workplace in Europe for three consecutive years.

Take a sneak peek at how it is to be part of HTB and our 2023 Global Retreat.

Get more insights about our HTB culture and employee experience by visiting the about us section of our site, our career site, and Glassdoor.

At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace.

We believe that diversity enriches our performance, services, and the communities we serve.

As such, we ensure that all job applications are considered solely based on merit, skills, and qualifications.

We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

We are dedicated to providing a fair and respectful work environment that reflects our values.

Required Skill Profession

It & Technology