Senior Java Back-end developer

Worldline; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Private medical & life insurance

MyBenefit Platform

Holiday allowance

Public transportation allowance

Meal allowance

Annual bonus

Job summary

Worldline is hiring a senior Java engineer in Warsaw to help design and deliver robust payment technology services. You will own end-to-end aspects from API design to deployment pipelines, collaborating with cross-functional teams across the Risk Tech Services unit.

You will work with Java, Spring Boot, PostgreSQL, Docker and modern CI/CD tooling, applying secure coding practices and advanced testing to ensure reliable systems. This role fosters growth and hands-on leadership in a global team.

Qualifications

• 4+ years of professional Java development experience.
• Experience with modern Java (latest LTS) and tooling.
• Proficiency in Java, OO and functional concepts.
• Strong Spring Boot and Spring ecosystem experience.
• Relational DB experience with PostgreSQL; design and tuning.
• Experience with Flyway or Liquibase for migrations.
• Design and build RESTful APIs; integrate distributed services.
• Experience with Docker and CI/CD pipelines (Jenkins/GitLab).
• Solid testing: unit and integration (JUnit, Testcontainers).
• Knowledge of clean/hexagonal architecture, patterns and security.
• Git and modern branching/merging workflows.

Responsibilities

• Work with cross-functional teams to deliver features and services.
• Own architecture decisions: service boundaries, APIs and data models.
• Design database schemas and manage migrations.
• Build RESTful APIs and asynchronous integrations.
• Apply resilience patterns and promote test-driven development.
• Own delivery: CI/CD pipelines, containers, cloud infra, observability.
• Diagnose complex issues; lead incident investigation and resolution.
• Participate in code reviews; mentor junior developers.
• Uphold coding standards, security practices and design principles.

Skills

Java development

Spring Boot

SQL

REST APIs

CI/CD

Testing

Git workflows

Security & resilience

Tools

Docker

Jenkins

GitLab CI

Flyway

Liquibase

PostgreSQL

Testcontainers

JUnit

Git

Job description

Who We Are

Worldline helps businesses of all shapes and sizes to accelerate their growth journey - quickly, simply, and securely. We are the innovators at the heart of the payments technology industry, shaping how the world pays and gets paid. Our technology powers the growth of millions of businesses across 5 continents. And just as we help our customers accelerate their business, we are committed to helping our people accelerate their careers. Together, we shape the evolution.

Who We Are

Worldline helps businesses of all shapes and sizes to accelerate their growth journey - quickly, simply, and securely. We are the innovators at the heart of the payments technology industry, shaping how the world pays and gets paid. Our technology powers the growth of millions of businesses across 5 continents. And just as we help our customers accelerate their business, we are committed to helping our people accelerate their careers. Together, we shape the evolution.

The opportunity

As a member of the Risk Technology Services technical team, you'll go beyond writing high-quality code – you will engage actively in architectural discussions, contribute to technical decisions, and take genuine end-to-end ownership of what you ship. From service design and API development to cloud infrastructure and delivery pipelines, you'll bring strong engineering fundamentals and a platform mindset to a team that builds and operates software together. We're looking for someone who is hands-on, collaborative, and makes the people around them better simply by doing great work.

Day-to-day Responsibilities

• Work closely with a cross functional team on the delivery of new features and services; setting the standard and technical direction for Risk tech service.
• Own architecture and design decisions: service boundaries, APIs, cross-service contracts, and data models - balancing simplicity, reliability, security, and maintainability.
• Design database schemas and manage evolution through versioned migrations.
• Design and build RESTful APIs and asynchronous/event-driven integrations between services.
• Apply resilience patterns (retries, idempotency, circuit breakers) and champion test-driven development with strong coverage.
• Own delivery: contribute to CI/CD pipelines, containerization, cloud infrastructure, and observability.
• Diagnose complex issues across services and infrastructure; lead incident investigation and resolution.
• Run and participate in code reviews; mentor mid-level and junior developers.
• Establish and uphold coding standards, security practices, and design principles across the team.

Who Are We Looking For

• 4+ years of professional Java development experience
• Experience with modern Java (latest LTS) and a mindset of keeping up with the newest stable language features and tooling.
• Proficiency in Java and object-oriented (and ideally functional) programming principles.
• Strong experience with Spring Boot and the Spring ecosystem, including Spring Security / OAuth2.
• Solid SQL and relational database experience (e.g. PostgreSQL), including schema design and query optimization.
• Experience with a schema migration / database versioning tool (e.g. Flyway, Liquibase).
• Proven experience designing and building RESTful APIs and integrating distributed services.
• Experience with containers (e.g. Docker) and CI/CD pipelines (e.g. Jenkins, GitLab CI)
• Strong experience with automated testing - unit and integration (e.g. JUnit, Testcontainers).
• Solid grasp of software architecture and design patterns (e.g. clean/hexagonal architecture, DDD).
• Solid Understanding of secure coding, resilience, and observability in production systems.
• Confident use of Git and modern branching/merging workflows.

Perks & Benefits

• Private medical & life insurance
• MyBenefit Platform
• Holiday allowance
• Public transportation allowance
• Meal allowance
• Annual bonus.

We are proud to be an Equal Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as an individual with a disability, or any applicable legally protected characteristics.

Pursuant to the Article 24 sec. 6 of the Act of 14 June 2024 on the protection of whistleblowers, we inform you that Worldline Financial Services (Europe) S.A., a joint-stock company, Branch in Poland (hereinafter referred to as Worldline) is governed by the Regulations on the receipt of internal reports and taking follow-up actions (hereinafter referred to as the Regulations).

AS2

Shape the evolution

We are on an exciting journey towards the next frontiers of payments technology, and we look for big thinkers, people with passion, can-do attitude and a hunger to learn and grow. Here you'll work with ambitious colleagues from around the world, take on unique challenges as a team, and make a real impact on the society. With an empowering culture, strong technology and extensive training opportunities, we help you accelerate your career - wherever you decide to go. Join our global team of 18,000 innovators and shape a tomorrow that is yours to own.

Learn more about life at Worldline at jobs.worldline.com

We are proud to be an Equal Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex, sexual orientation, gender identity, gender expression, age, status as an individual with a disability, or any applicable legally protected characteristics.

Shape the evolution

We are on an exciting journey towards the next frontiers of payments technology, and we look for big thinkers, people with passion, can-do attitude and a hunger to learn and grow. Here you'll work with ambitious colleagues from around the world, take on unique challenges as a team, and make a real impact on the society. With an empowering culture, strong technology and extensive training opportunities, we help you accelerate your career - wherever you decide to go. Join our global team of 18,000 innovators and shape a tomorrow that is yours to own.