Senior Java Engineer

Happy Team; Łódź; Remote; PLN 120,000 - 180,000; Full time

Job summary

A dynamic technology company based in Poland is seeking a Senior Java Engineer to enhance its cutting-edge parcel services platform. The ideal candidate will have strong Java skills, a passion for clean code, and experience with Spring. This role offers flexible remote work, comprehensive health benefits, and a supportive team culture focused on growth and collaboration.

Benefits

Comprehensive health insurance

Monthly workshops

Financial support for office space rental

Multisport card

Company retreats

Qualifications

• Strong knowledge of Java 8+ and backend development experience.
• Awareness of Clean Code principles.
• At least 5 years of professional experience in software development.

Responsibilities

• Design, develop, and maintain high-performance backend systems.
• Collaborate with team members on architecture and solution design.
• Mentor junior developers and support team growth.

Skills

Java 8+

Spring and Spring Boot

Unit testing

Git version control

Maven build systems

Database and ORM skills

English (B2 minimum)

Cloud awareness (Azure)

Job description

About us

We are looking for a Senior Java Engineer to join our team and support the ongoing development a cutting‑edge platform that enhances commercial parcel services, including advanced tracking capabilities. It’s another milestone for our growing relationship with one of our biggest clients - Royal Mail Group.

Our team is composed of experienced developers, architects, and analysts who thrive on collaboration and continuous learning.

At Happy Team, we believe that satisfied employees are the key to success.

Here’s what we offer

• friendly and inclusive team environment,
• partnership approach and shared growth,
• flexible working hours and remote work options,
• company retreats and regular team‑building activities.

Who are we looking for

We’re seeking a skilled Senior Java Engineer with a passion for creating clean, efficient, and scalable code. If you enjoy working on impactful projects with a team of talented professionals, this role is for you!

Requirements:

• Strong knowledge of Java 8+ and backend development experience,
• Awareness of Clean Code principles,
• Hands‑on experience with Spring + Spring Boot,
• Proficiency in unit testing,
• Familiarity with Git for version control,
• Experience with Maven build systems,
• Strong database and ORM skills,
• Cloud awareness and experience with platforms like Azure,
• At least 5 years of professional experience in software development,
• Great level of English (B2 minimum).

Nice to haves:

• Strong understanding of Object‑Oriented Analysis and Design (OOA/D) concepts and tools,
• Experience with data modeling, including relational and hierarchical models,
• Proficiency in API design and architecture awareness,
• Expertise in messaging systems (e.g., Kafka, Service Bus),
• Knowledge of design patterns, concurrency, and performance tuning,
• Hands‑on experience with observability, logging, and resilience patterns,
• Familiarity with horizontal scaling and distributed systems,
• Experience with Spring Framework modules such as Spring Web (REST), Spring Integration, Spring Cloud Stream, and Spring Data (JDBC, JPA, Redis),
• Proficiency in Azure‑specific technologies, including Cosmos DB, Event Hubs, Blob storage, and Serverless (Functions, Logic Apps),
• Understanding of Azure DevOps (ADO boards) and CI/CD practices,
• 8+ years of professional experience in software development.

Resposibilities:

• Design, develop, and maintain high-performance backend systems,
• Collaborate with team members on architecture and solution design,
• Optimize system performance and ensure code quality,
• Participate in Agile ceremonies and contribute to continuous improvement,
• Mentor junior developers and support team growth.

What we offer:

• Flexible and fully remote work arrangements,
• B2B contract,
• Comprehensive health insurance,
• English lessons to support your development,
• Monthly workshops and a training budget for technical or soft skills,
• Multisport card,
• Financial support for office space rental,
• Happy initiatives like charity fundraisers and bonuses for first-time parents,
• Biannual Happy Trips (company retreats),
• Informal, goal‑oriented atmosphere with the full support of our Happy Team.