We are seeking an experienced, hands-on Lead Software Engineer with strong expertise in Java/Spring Boot, data engineering and distributed systems. The role will focus on developing scalable backend services, event-driven integrations and data processing capabilities that support modern enterprise platforms. The successful candidate will provide technical leadership, contribute directly to software development, guide engineering teams and contractors, and collaborate with full-stack engineers to deliver reliable, data-intensive applications and AI-enabled solutions Responsibilities: • Lead the technical design and development of scalable backend services, data integrations and distributed applications. • Remain hands-on in coding, implementing complex backend components, data processing logic and integration services. • Provide day-to-day technical guidance to engineers and contractors, including design reviews, code reviews and technical problem-solving. • Design and develop event-driven solutions using Kafka, messaging platforms and asynchronous processing patterns. • Drive effective data modelling, data ingestion, transformation and integration across enterprise systems. • Develop high-performance APIs and microservices using Java and Spring Boot. • Collaborate with frontend engineers to deliver end-to-end application capabilities, with working knowledge of Angular and TypeScript. • Support AI-enabled capabilities, including data preparation, intelligent automation, retrieval workflows and integration with AI services. • Establish engineering standards for data quality, reliability, performance, scalability and maintainability. • Champion automated testing, CI/CD, observability, secure development and operational resilience. • Identify and resolve complex technical challenges involving distributed systems, integration failures and data processing. • Mentor engineers, promote knowledge sharing and ensure sustainable internal ownership of developed solutions. Recommended Qualifications:  • Strong hands-on experience with Java, Spring Boot, REST APIs and microservices. • Strong experience with SQL, relational databases, data modelling and data integration. • Experience with Kafka, event-driven architecture and asynchronous messaging. • Good understanding of distributed systems, scalability, resilience and performance optimisation. • Working knowledge of Angular, TypeScript and frontend-backend integration. • Experience with data ingestion, transformation and processing pipelines. • Familiarity with Kubernetes/OpenShift, CI/CD and automated testing. • Exposure to AI/LLM technologies, retrieval systems or AI-driven data processing is advantageous. • Demonstrated ability to lead technical delivery while contributing directly to production code. Education: • Bachelor’s degree/University degree or equivalent experience • Master’s degree preferred We offer: By joining Citi Solutions Center Poland, you will not only be part of a business casual workplace with a hybrid working model (currently up to 2 days working at home per week), but also (potentially, subject to final offer) receive a competitive base salary and enjoy a whole host of additional benefits which can include: • Employer paid Defined Contribution Pension Plan contribution of 6% of employee’s pensionable earnings (PPE Program) • Employer paid Private Medical Care Package for employees and Private Medical Care Packages for certain family members available at preferential rates • Employer paid Life Insurance Program for employees and Life Insurance for certain family members available at preferential rates • Employee Assistance Program financed by Employer • Paid Parental Leave Program (maternity and paternity leave; statutory and 2 weeks additional paid paternity leave) • Sport Card for employees subsidised via Social Benefits Fund and Sport Cards for certain family members available at preferential rates • Additional benefits from Company’s Social Benefit Fund, in particular: Holidays Allowance, support for sport and cultural activities, team building events. • Additional day off for volunteering • Cafeteria/ flex benefit – a company benefits system which enables employees to select and purchase benefits offered by a provider and available for employees on the platform. • Opportunity to receive an annual discretionary incentive award • Special offers and discounts for employees • Copy and paste the URL below into a new tab on your web browser to view the Remuneration Regulations extract: https://tbcdn.talentbrew.com/company/287/cms/v3/docs/policies/RemunerationRegulations-KeyProvisions-CitibankEurope_plc_05012025_A.pdf   Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self every day.  We want the best talent around the world to be energized to join us, motivated to stay, and empowered to thrive.  Sounds like Citi has everything you need? Then apply to discover the true extent of your capabilities.  ------------------------------------------------------ Job Family Group: Technology------------------------------------------------------ Job Family: Systems & Engineering------------------------------------------------------ Time Type: Full time------------------------------------------------------ Primary Location Full Time Salary Range: 241 750,00 zł - 411 650,00 zł------------------------------------------------------ Most Relevant Skills Please see the requirements listed above.------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter.------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.   If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster.