We are looking for the very Top Talent…and we would be delighted if you were to join our team! More in details, UST is a multinational company based in North America, certified as a Top Employer company with over 35,000 employees all over the world and presence in more than 30 countries. We are leaders on digital technology services, and we provide large-scale technological solutions to big companies.

What Are We Looking For? We are looking for a

Senior Full Stack Engineer with more than 5 years of experience , strong expertise in

Java, Spring Boot, and React , and the ability to take end-to-end ownership of features.

You will join a

100% remote project , working with one of our clients, a

leading company in the Spanish banking sector . We are looking for solid experience with

AWS, CI/CD, REST APIs, and automated testing , as well as a

B2 level of English or higher .

Location: 100% Remote for candidates based in Spain.

Language: English is a must. Spanish desirable.

Main requirements:

More than

5 years of software development experience , with the ability to work independently on Full Stack solutions and take end-to-end ownership of features.

Strong experience developing

APIs and microservices with Java / Spring Boot , including the design, implementation, integration, and evolution of REST APIs.

Hands‑on experience developing and modifying

Frontend applications with React , including API integration and the evolution of existing applications.

Experience developing or modifying

mobile applications

would be a plus.

Experience with relational databases such as

PostgreSQL

and technologies such as

JPA / Hibernate .

Experience working with

AWS and cloud architectures .

Strong, demonstrable experience with

CI/CD, pipeline automation, quality gates, testing, and deployment processes .

Experience with testing beyond unit testing, including

integration testing, API testing, functional testing, and end-to-end testing . Experience with tools such as

Playwright,



Cypress, Selenium, Postman/Newman , or similar would be a plus.

Experience with

Git, Maven, JUnit, and Mockito .

Knowledge of

hexagonal, decoupled, and event‑driven architectures .

Ability to work end‑to‑end on a feature, making changes when necessary across the different layers:

React → API → microservices → persistence → integration → testing → deployment .

Experience applying

Artificial Intelligence to the software development lifecycle

will be highly valued, for example through AI‑assisted coding tools, code generation and review, test generation, documentation, analysis/troubleshooting, or improving development productivity.

A good level of

English is mandatory (minimum B2) , with the ability to communicate confidently in an international professional environment, including conversations, technical documentation, and meetings.

Native or equivalent level of Spanish

is also required.

Java, Spring Boot, React, REST APIs, PostgreSQL, JPA/Hibernate, AWS, Git, Maven, CI/CD, automated testing.

What can we offer? 23 days of Annual Leave plus the 24th and 31st of December as discretionary days!

Numerous benefits (Health Care Plan, teleworking compensation, Life and Accident Insurances).

Free access to several training platforms

Professional stability and career plans

UST also compensates referrals from which you could benefit when you refer professionals.

The option to pick between 12 or 14 payments along the year.

Real Work Life Balance measures (flexibility, 100% remote work policy, compacted hours during summertime…)

UST Club Platform discounts and gym access discounts

Opportunities to work on cutting‑edge banking and financial technology solutions

In UST we are committed to equal opportunities in our selection processes and do not discriminate based on race, gender, disability, age, religion, sexual orientation or nationality. We have a special commitment to Disability & Inclusion, so we are interested in hiring people with disability certificate.

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📌 Senior FullStack | Java & React | 100% Remote ONLY in Spain (Barcelona)
🏢 UST España & Latam
📍 Barcelona