Lead Backend Engineer, Data & Distributed Systems (Hybrid)

Citigroup

Warszawa

Hybrid

PLN 240,000 - 360,000

Full time

2 days ago

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Benefits offered by this job

Employer paid Defined Contribution Pe

Private Medical Care Package

Life Insurance

Employee Assistance Program

Parental Leave

Sport Card

Social Benefit Fund

Volunteer day

Cafeteria/ flex benefits

Annual incentive program

Employee discounts

Job summary

Citi Solutions Center Poland is seeking an experienced Lead Software Engineer to architect and build scalable backend services using Java and Spring Boot. You will drive data integrations, event-driven patterns with Kafka, and work closely with frontend teams (Angular/TypeScript) to deliver end-to-end capabilities.

The role combines hands-on coding with technical leadership in a mature, enterprise environment.

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.

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.