Java Backend Developer (Hybrid/Remote in Spain)

Java Backend Developer (Hybrid/Remote in Spain)

Barcelona, Spain (Hybrid) 3 days ago

• We’re fair — we believe that fairness and respect drive both efficiency and team motivation.
• We’re dedicated — we work hard for our own results, but we work harder for our clients.
• We’re honest — we say things as they are, honestly and directly.
• We’re courageous — we have enough determination and drive to do our best work, take risks, test and try again.
• We’re team lovers — we love to share, help each other and to be an active part of the team.

In Tappx we keep growing and, therefore, we are looking for new talented people to join our Performance Tech team in our IT department.

As a Senior Java Backend Developer you will:

• Participate in the entire applications life cycle with focus on coding and debugging.
• Write clean and maintainable code of high quality accomplishing estimated hours and due dates.
• Offer Technical support to the Performance department.
• Troubleshoot and debug applications.
• Collect technical needs and design requirements.
• Identify new needs and propose solutions to improve our applications.
• Learn about technologies different than Java existing in our tech stack.
• Measure the impact of new features, interpret key metrics and collaborate with the data team for data-driven decision making.
• Deeply understand the business you are working with.

Your Dream Job Awaits at Techsoulogy!

Indefinite Contract with Competitive Conditions

Flexible Working Hours (Take Control of Your Schedule) with core time

Hybrid Model in Barcelona & Madrid (1 day in the office and the rest teleworking) or 100% Remote Work Anywhere in Spain

Cool HQ Offices in Barcelona and Co-Working in Madrid

At Tappx, we believe the best ideas come from the most diverse minds. We are committed to building a team where different backgrounds, perspectives, and experiences are not just welcomed — they are essential. We foster an inclusive, respectful, and psychologically safe environment where everyone can do their best work and grow as a professional. We take ethics seriously: in how we build our technology, how we treat our people, and how we show up in the industry. Because doing things right and doing things well are not in conflict — they go hand in hand.

Home or office? Both!

Private health insurance

English and Spanish classes

Employee referral program

Regular team building activities

Internal Talks

Giving back together

Surprise perks

Save while you spend

Requirements

We are looking for if you have:

• 2-3+ years of experience as Backend Developer.
• Minimum 2 years of experience developing in Java, Spring and MySQL.
• Medium knowledge of Git.
• Basic knowledge of Linux.
• Basic knowledge of Docker.
• Basic knowledge of Kafka
• Basic Knowledge of AGILE tools (such as Jira).

Tappx is a fast-growing AdTech firm offering innovative monetization, user acquisition, and advertising solutions for apps, web, and CTV. Its proprietary technology helps publishers maximize ad revenue while ensuring brands and agencies benefit from enhanced trust and transparency. The Tappx platform processes 80 billion+ ad requests per month worldwide.

Besides monetization, Tappx drives performance growth with advanced programmatic and user acquisition solutions. Advertisers scale efficiently with premium direct and owned inventory, KPI-driven optimization, and high-performing ad creatives. With flexible CPC, CPA, or CPI models, brands only pay for results while receiving tailored strategies and expert support.

Tappx has earned top industry recognition. In 2025, it was shortlisted again inThe Financial Times’ FT1000: Europe’s Fastest Growing Companiesreport. Previously, it ranked Europe’s 2nd fastest-growing advertising company (FT1000, 2020), won Best AdTech Company to Work For in Spain (PS Awards, 2023), and was a finalist for SME of the Year (CEPYME, 2022). Founded in 2013 by Daniel Reina (CEO) and Antonio Hervás (CTO), Tappx continues to push the boundaries of digital advertising.