Senior Backend Engineer - Python/Django

Holafly; Dublin; On-site; EUR 85,000 - 110,000; Full time

Benefits offered by this job

25 Days PTO

5% pension contribution

€ 3000 for Medical/Health coverage

Self development budget

Job summary

Holafly, a fast-growing scale-up, is seeking a Back-end Engineer to power our global connectivity platform. You will own the development of high-performance APIs and microservices used by millions of users worldwide.

Based in Ireland, you will collaborate with Product and QA teams, implement robust unit tests with Pytest, and drive performance optimizations to eliminate bottlenecks and N+1 queries. Fluency in English required; Spanish is a plus.

Qualifications

• 5+ years of backend development with Django + DRF.
• Microservices design experience and integrating third-party apps.
• Proficiency in asynchronous programming and high-load queries.

Responsibilities

• Build and optimise mission-critical microservices with Python, Django, DRF.
• Implement robust unit testing (Pytest) and automated quality checks.
• Architect scalable APIs to handle high-concurrency traffic.
• Resolve performance bottlenecks and N+1 query issues.
• Collaborate with Product and QA to translate business logic into technical solutions.
• Champion software lifecycle best practices, including design patterns and code reviews.

Skills

Django

DRF (Django REST Framework)

Unit testing

Microservices design

Asynchronous programming

Tools

Pytest

SQL databases

REST APIs

Job description

Holafly is a high-growth scale-up revolutionising how businesses and travellers connect to the internet abroad. Since 2018, we’ve empowered travellers in over 200 destinations worldwide with secure and reliable eSIM solutions. With a team of 500+ professionals across multiple countries, we are scaling globally to support travellers with seamless, unlimited data connectivity.

We’re not just connecting people—we’re enabling freedom and peace of mind, ensuring our users stay connected from the second they land, wherever their journey takes them.

The team

You would be part of the IT Delivery team. For us, companionship and enjoyment when doing our work come first. We believe in continuous improvement, automation and collective knowledge without leaving human values behind. Always following best practices.

The role

As a Back-end Engineer, you will be the technical engine behind our global connectivity platform, ensuring our services are scalable and resilient. You will own the development of high-performance APIs, directly enabling millions of users to stay connected anywhere in the world.

Key Responsibilities

• Build and optimise mission-critical microservices using Python, Django, and Django REST Framework (DRF).
• Engineer Quality Frameworks by implementing robust unit testing (Pytest) and automated quality checks to ensure elite code standards.
• Architect scalable APIs from scratch, ensuring they can handle high-concurrency traffic during peak travel seasons.
• Eliminate technical debt by identifying and resolving performance bottlenecks, including N+1 query issues and asynchronous task optimisation.
• Collaborate across borders with Product and QA teams to translate complex business logic into maintainable technical solutions.
• Champion best practices in the software life-cycle, from design patterns and documentation to comprehensive code reviews.

Qualifications

• 5+ years of experience in backend development with a mastery of Django and Django REST Framework (DRF).
• Strong expertise in Unit Testing and establishing quality-first development frameworks.
• Proven experience designing microservices architectures and integrating complex third-party ecosystem applications.
• Proficiency in asynchronous programming and managing high-load database queries.
• Based in Ireland or willing to relocate, with a valid work visa already in place (Holafly does not provide visa sponsorship or relocation assistance).

Good to have

• Fluency or professional working proficiency in Spanish.
• Experience with Silk or other performance profiling tools.

Benefits & Perks

• 25 Days of PTO
• 5% pension contribution
• € 3000 for Medical/Health coverage
• Self development budget of $ 500

During a trip to Thailand, Pedro and Lidia, the founders of Holafly, experienced the frustration of not having an internet connection.

Inspired by their own experiences, they came up with a simple but brilliant idea: why not allow travellers to buy data plans for any destination from their home country?

Our passion for providing easy and convenient connectivity to travellers around the world drives everything we do.

We love our work and we do it with pride. Stay connected wherever you go.