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Senior Java Developer

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Summary

Senior backend developer designing high-volume data integration and transformation processes for a European travel booking platform, using Java, Spring Boot, Kafka, MySQL, and microservices with hexagonal architecture in the cloud. Starts as a freelance contractor on a European timetable, with visa sponsorship and relocation support to the Bilbao area later.

This position is for an international travel-tech company with over 20 years of experience and a strong presence across several European countries.
The company specializes in digital travel booking solutions, working with cutting-edge technologies in a multicultural environment that fosters collaboration and technical excellence.
What will your day-to-day look like?
  • Design and implement integration and transformation processes for high-volume data.
  • Work with Spring Boot, Kafka, MySQL databases, and modern technologies in cloud environments.
  • Actively participate in architectural decisions: microservices, hexagonal design, and a modular, scalable approach.
  • Collaborate with a technical team that values shared knowledge, healthy high standards, and continuous learning.
  • Contribute to a solution used across multiple European countries that is constantly evolving.

Note: This is a purely technical position focused on individual contribution;
there are no immediate paths to management or increased non-technical responsibility.
Mandatory Requirements
  • 6+ years of experience as a Backend Developer with Java (8, 11, or 17) .
  • Mastery of Spring Boot. Knowledge of Spring Batch is highly valued.
  • Experience with Big Data and relational databases (preferably MySQL).
  • Microservices architecture experience (candidates with only monolith experience will not be considered).
  • Practical knowledge of Hexagonal Architecture.
  • Fluent conversational English (minimum B2) , as you will work daily in English.
  • Unit testing proficiency.
  • Experience with Pair Programming.

We also highly value experience in:
  • Kotlin , even if it is not your primary language.
  • .NET projects , provided you maintain solid experience in Java.
  • Universal REST API connections.
  • Build automation tools (Maven) and version control (Git).
  • Multithreading , performance optimization, and resource management (Memory/CPU).

AI Mindset
We are looking for professionals who integrate AI into their daily workflow as a fundamental mindset, going beyond coding to optimize tasks, preparation, and communication.
Our Selection Process
We want our process to be agile, human, and respectful of your time.
  1. Initial Interview with Konexio: To get to know you, validate your English, and explain how we support the relocation process.
  2. Technical Interview: A deep dive into your real-world experience with Java, architecture, cloud, and data solutions.
  3. Client Interview: Meet the technical team to ensure a strong technical and cultural fit.

Our Value Proposition
As our colleagues say: if you are a Senior professional, you know exactly what you are looking for. That’s why our proposal is transparent from the start.
Work Model:
  • Phase 1: You will begin as a contractor (freelance) , working on European timetable .
  • Phase 2 (Relocation): We know early mornings are tough! If there is a strong team match and high technical performance, we will sponsor your Visa (and those of your partner/family) if you do not already have Spanish residency.
  • Additionally, we provide hands-on support throughout your relocation, including active assistance in finding your new home in Bilbao area.

Once in Bilbao (Basque Country):
  • Salary: 100% transparency regarding salary brackets, ensuring your experience matches local market standards.
  • Tax Optimization: There are local tax deductions (Foral tax laws) that may seem complex at first, but we will guide you to ensure you pay the legal minimum.
  • Hybrid & Flexible: We balance remote work with office days a week to foster team collaboration

Real Wellbeing:
  • Health Insurance: Partially funded by the company, including reimbursements for physio, dental, psychology, nutrition, and vision. (While the Basque public health system is excellent, this insurance is also required for the Visa process).
  • Flexible Remuneration (Factorial Benefits): Save on taxes for meals, transport, or childcare.
  • Sick Leave: We cover 100% of your salary during the first 3 days of illness.
  • Time Off: Your birthday is a day off , in addition to 23 days of vacation.
  • Galatea’s Tortilla: Every Thursday in the office, we enjoy traditional Spanish omelets together.
  • Multiculturalism: A team comprised of diverse backgrounds and nationalities.
  • Off-sites & Activities: We host various team-building events and activities throughout the year.

Pro-Tip for your CV:
Since the ad specifically mentions "no possibility of higher responsibility," emphasize your passion for Technical Excellence and Individual Contribution (IC) in your profile.

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