Java Developer (Spring)

Senior • Remote

Warsaw, Poland

Description

Andersen is hiring a Java Developer (Spring) for a project developing scalable microservices-based platforms and high-load digital services in the financial domain. The project focuses on evolving a modern digital platform built on a microservices architecture, supporting high-traffic online services and advanced search capabilities with strong emphasis on scalability, cloud-native technologies, and performance optimization.

Responsibilities

Designing and implementing complex backend components for the microservice-based platform.
Making architectural decisions and defining technology direction together with the team.
Designing REST and event-driven APIs, asynchronous communication via Kafka.
Designing and performance-tuning PostgreSQL and Elasticsearch solutions for high-traffic real estate search.
Developing services running on Azure cloud infrastructure with operational considerations in mind.
Conducting code reviews and establishing development standards.
Mentoring mid-level and junior colleagues and supporting knowledge sharing.
Working closely with Product, Frontend, and DevOps teams.
Reducing technical debt and implementing refactoring initiatives.

Must-haves

6+ years of experience in Java backend development.
Deep knowledge of Spring Boot and Spring ecosystem (Security, Data JPA, Cloud).
Experience designing microservice architectures, including operational aspects.
Strong command of design patterns and architectural principles (SOLID, Clean Code, DRY).
Strong SQL skills and production experience with PostgreSQL (indexing, partitioning, performance tuning).
Experience with Apache Kafka or other event streaming solutions.
Testing experience with JUnit, Mockito, Testcontainers, and integration tests.
Knowledge of Azure cloud environments (AKS, Azure Monitor, Key Vault, Blob Storage).
Docker experience and basic Kubernetes/AKS knowledge.
Experience working in Agile (Scrum) methodology.
Ability to independently design and document complex systems.
Upper-Intermediate English level or higher.

Nice-to-haves

Experience operating Elasticsearch clusters and schema design.
Azure certifications (e.g., AZ-204, AZ-305) or deeper Azure PaaS knowledge.
Experience with Domain-Driven Design (DDD) or hexagonal architecture.
Experience with NoSQL databases (e.g., Redis, MongoDB).
Experience with API gateway solutions (e.g., Azure API Management).
Domain experience in real estate platforms or marketplaces.

Benefits

Opportunity to change projects and develop expertise in different business domains.
Professional, financial, and career growth opportunities.
Mentoring and adaptation system for each new employee.
Additional monthly bonus potential based on expertise.
Access to a continuously updated corporate training portal.
Certification compensation (AWS, PMP, etc.).
Referral program.
Private health insurance and sports compensation.
Personal data protection in accordance with GDPR regulations.

Andersen

Andersen is a prominent company operating in the technology industry, known for its collaboration with leading businesses across various sectors such as FinTech, Healthcare, Retail, Telecom, and more. The company partners with renowned brands like Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, and T-Systems, showcasing its extensive reach and influence. Andersen is committed to fostering professional, financial, and career growth for its employees, offering systems of mentoring and adaptation for new hires. The company values continuous learning and development, providing access to a corporate training portal and supporting certification pursuits. Andersen also emphasizes a vibrant corporate culture, with activities and benefits that enhance employee engagement and well-being. The company is dedicated to protecting personal data in compliance with GDPR regulations.

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