Senior Java Developer

Join us as a Senior Java Developer

Build high-performance systems for real-time trading

We are looking for a Senior Java Developer to contribute to the design, development, and maintenance of our high-performance trading software solutions in Porto. You will build reliable, scalable, and low-latency backend systems that power mission-critical trading operations for banks, brokers, and funds.

This role requires strong autonomy, accountability, and a clear commitment to product quality and client success, while actively contributing to a culture of excellence, collaboration, and continuous improvement.

Hybrid working model: 4 days per week in the office.

Why this role is exciting

• Build high-performance backend systems for real-time trading platforms
• Work on low-latency, data-intensive applications in mission-critical environments
• Be part of a collaborative team where senior engineers have real influence
• Contribute to system architecture, performance optimization, and product evolution
• Mentor others while continuing to grow technical

Key Responsibilities

Software Design & Development

• Design, develop, implement, test, and maintain efficient and reliable Java backend components and UIs
• Build scalable, high-availability trading software using Java, Spring, Spring Boot, JPA/Hibernate, and REST APIs
• Ensure system reliability, performance, and efficiency under high-load and low-latency conditions
• Apply best practices for code quality, testing, and performance optimization
• Participate actively in architectural discussions, aligning technical solutions with business goals
• Maintain product quality and consistency across releases

Quality, Accountability & Compliance

• Deliver production-ready code within agreed timelines and quality standards
• Design and execute automated unit, integration, and performance tests
• Proactively identify and resolve bottlenecks, defects, and performance issues
• Take full ownership of deliverables, ensuring compliance with internal procedures, client requirements, and regulatory standards
• Write, maintain, and update clear and accurate technical documentation aligned with product releases
• Maintain strict confidentiality of source code, client information, and proprietary data
• Provide regular updates and report activities to management

Collaboration & Client Success

• Work closely with Business Analysts to translate functional requirements into effective technical solutions
• Prototype solutions when required
• Support QA and DevOps teams to ensure smooth deployment and reliable production performance
• Contribute to customer satisfaction by delivering robust, maintainable, and scalable systems
• Act as a proactive partner in achieving long-term client success

Leadership, Mentorship & Continuous Improvement

• Mentor and guide junior developers, promoting autonomy, accountability, and technical excellence
• Encourage knowledge sharing, code reviews, and team collaboration
• Stay current with advancements in Java and trading technology
• Stay updated on financial markets, trading workflows, and relevant technologies
• Contribute to process improvement initiatives and the evolution of best practices across the development lifecycle
• Proactively identify opportunities to improve system performance and scalability

Profile & Qualifications

Technical Skills

• BSc in Computer Science, Engineering, or a relevant field
• Minimum 5 years of experience in Java backend development, preferably in trading or financial software
• Proven expertise in Java, Spring, Spring Boot, JPA/Hibernate, and REST APIs
• Excellent programming skills, with the ability to produce technical documentation in a clear and meaningful way
• Deep knowledge of development best practices (Agile methodology and Atlassian suite: Bitbucket, Jira, Confluence) and industry-standard libraries (stdlib)
• Strong expertise in multi-threaded, high-performance, and network programming (TCP sockets)
• Solid understanding of Linux environments, cloud deployment, Version Control Systems, and CI/CD tools (Git, Jenkins)
• Full autonomy in using debugging and profiling tools
• Knowledge of messaging systems (Kafka, RabbitMQ) and databases (SQL, NoSQL)
• Familiarity with containerization and orchestration tools (Docker, Kubernetes)
• Familiarity with serialization frameworks
• Experience with financial systems, trading workflows, or market data is a plus

Soft Skills & Mindset

• High level of accountability, autonomy, and efficiency
• Strong analytical and problem-solving skills
• Excellent communication and teamwork abilities, with a client-first mindset
• Commitment to product quality, confidentiality, and continuous learning

Languages

• Fluency in English (both written and spoken)

Apply by submitting a CV in English.

Euronext Values

Unity

• We respect and value the people we work with
• We are unified through a common purpose
• We embrace diversity and strive for inclusion

Integrity

• We value transparency, communicate honestly and share information openly
• We act with integrity in everything we do
• We don’t hide our mistakes, and we learn from them

Agility

• We act with a sense of urgency and decisiveness
• We are adaptable, responsive and embrace change
• We take smart risks

Energy

• We are positively driven to make a difference and challenge the status quo
• We focus on and encourage personal leadership
• We motivate each other with our ambition

Accountability

• We deliver maximum value to our customers and stakeholders
• We take ownership and are accountable for the outcome
• We reward and celebrate performance

We are proud to be an equal opportunity employer. We do not discriminate against individuals on the basis of race, gender, age, citizenship, religion, sexual orientation, gender identity or expression, disability, or any other legally protected factor. We value the unique talents of all our people, who come from diverse backgrounds with different personal experiences and points of view and we are committed to providing an environment of mutual respect.

Additional Information

This job description is only describing the main activities within a certain role and is not exhaustive. It does not prevent to add more tasks, projects.