Senior Java Developer- banking industry (f/m/x)

Sii Poland; Warszawa; Hybrid; PLN 210,000 - 270,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Medical care

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Job summary

Sii Poland in Warsaw is seeking a seasoned Java developer to join a long-term financial sector tech initiative. You will contribute to high-performance data-driven applications and collaborate with business and engineering teams to design solutions using modern backend technologies, distributed architectures, and microservices.

You will work in a hybrid model with regular Warsaw office presence, leveraging Spring, Hibernate, and modern data platforms while communicating effectively in English

Qualifications

• At least 5 years of Java experience and OO programming
• Strong SQL skills and data modeling
• Experience designing scalable, high-availability systems
• Experience with REST-based services, distributed systems, and microservices
• Willingness to work in a hybrid model with 3 days per week in Warsaw
• Excellent English communication skills

Responsibilities

• Design and develop scalable applications based on object-oriented principles
• Translate business and technical requirements into reliable software solutions
• Build data processing components and analytical services
• Collaborate with stakeholders and cross-functional teams
• Participate in architecture, implementation, testing, and deployment; develop distributed, event-driven services and microservices

Skills

Java

OO programming

Relational databases

System architecture

RESTful services

Distributed systems

Microservices

Event-driven

English fluency

Problem solving

Education

Bachelor's degree in Computer Science

Tools

Spring Framework

Hibernate

Kafka

PostgreSQL

Job description

Join a long-term technology initiative within the financial sector focused on building advanced systems that support liquidity forecasting, financial resource optimization, cash management, and strategic decision-making. In this role, you will contribute to the development of high-performance, data-driven applications that process large volumes of business-critical information in real time. Working closely with business stakeholders and engineering teams, you will help design innovative solutions leveraging modern backend technologies, distributed architectures, event-driven processing, and emerging AI capabilities.

Your tasks

• Designing and developing scalable full-stack applications based on object-oriented principles
• Translating business and technical requirements into reliable, maintainable software solutions
• Building data processing components, analytical services, and automated tools supporting business decision-making
• Collaborating with internal stakeholders, end users, and cross-functional engineering teams
• Participating in the full software development lifecycle, including architecture, implementation, testing, and deploymentDeveloping solutions based on distributed systems, event-driven architectures, APIs, and microservices

Requirements

• At least 5 years of experience in software development using Java and object-oriented programming concepts
• Strong expertise in relational databases, data modelling, and system architecture design
• Experience building highly available, scalable, and resilient business-critical applications
• Practical knowledge of REST-based services, distributed systems, messaging platforms, and modern development practices
• Openness to working in a hybrid model, including regular presence in the Warsaw office (3 days per week)
• Excellent analytical, problem-solving, and communication skills, along with fluent spoken and written English

Job no. JOB-J9CLH

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care