Java Developer (e-commerce)

Britenet; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Team events

Flexible hours

Hybrid work

Job summary

Britenet in Warsaw is seeking an experienced Java Developer to join a team delivering highly complex solutions. You will design and implement scalable Kotlin-based features and distributed components, with ownership of quality, observability, and technical debt.

The role involves integrating AI capabilities with LLMs and agentic frameworks, collaborating closely with Product Managers, UX Designers, and cloud engineers on GCP/Kubernetes, and mentoring teammates.

Qualifications

• Min. 5 years of experience as Java Developer.
• Proven track record delivering highly complex solutions.
• Strong Java ecosystem knowledge: Java, Kotlin, Groovy, Spring.
• Experience with Spark, Hadoop, Mesos and TensorFlow.
• Experience with TDD, DDD, CI/CD, and Pair Programming.
• Strong Polish and English communication (B2).
• Open to hybrid work from the client's Warsaw office.

Responsibilities

• Design, build, and maintain highly scalable Kotlin-based features and distributed components, owning code quality, observability, and technical debt management.
• Drive the technical implementation of AI capabilities by integrating LLMs, agentic frameworks, and smart automation into the core platform to enhance end-user experience.
• Collaborate with Product Managers, UX Designers, and cloud engineers on GCP/Kubernetes, evaluating trade-offs, managing risks, and mentoring the team.
• Act as autonomous contributor within a team of specialists.

Skills

Java

Kotlin

Groovy

Spring Framework

Python

Go

Apache Spark

Apache Hadoop

Apache Mesos

TensorFlow

TDD

DDD

CI/CD

Pair Programming

LLM integration

System design

Observability

Architecture

Risk management

Cross-functional collaboration

Polish language

English language

Tools

Kubernetes

GCP

Job description

• Min. 5 year of experience as Java Developer
• Proven track record as a Software Engineer in delivering highly complex solutions.
• Knowledge and experience with Java Ecosystem - Java, Kotlin, Groovy, Spring Framework, and other languages - Python, Go
• Experience with Apache Spark, Apache Hadoop , Apache Mesos and TensorFlow
• Knowledge of engineering practices & methodologies: TDD, DDD, CI/CD, Pair Programming
• Fundamental experience and a strong interest in AI-driven solutions, particularly in LLM integration and agentic systems/frameworks.
• Ability to lead the design and implementation of complex system features and components.
• Strong sense of ownership over delivered solutions, including code quality, stability, scalability, and observability (monitoring, logging).
• Experience in driving architectural decisions and evaluating technical trade-offs.
• Proficiency in identifying and managing technical risks, dependencies, and technical debt.
• Evaluating technical decisions through the lens of user impact, rather than solely fulfilling specifications.
• Strong collaborative skills in working alongside engineers, Product Managers, and UX/UI Designers.
• High level of autonomy and accountability, characteristic of contractor roles.
• Advanced communication skillis both in Polish and English (at least B2 level).
• Open to hybrid work from the client's Warsaw office.

Nice to have

• Practical experience with cloud environments (GCP preferred) and Kubernetes.
• Experience working with large-scale, distributed systems.
• Experience in cross-team collaboration within complex organizational structures.
• Providing technical mentorship and knowledge sharing within the project team.
• Advising on technical best practices and driving the optimization of engineering standards across the project.

Main responsibilities

• Design, build, and maintain highly scalable, robust Kotlin-based features and distributed components, taking full ownership of code quality, observability, and technical debt management.
• Drive the technical implementation of cutting-edge AI capabilities by integrating LLMs, agentic frameworks, and smart automation into the core platform to directly enhance the end-user experience.
• Act as a true autonomous contributor within a team of specialists and collaborate closely with Product Managers, UX Designers, and cloud engineers on GCP/Kubernetes while evaluating trade-offs, managing technical risks, and mentoring the team.

A good and friendly atmosphere in the company and the satisfaction of working with both departmental colleagues and direct superiors.

Team-building events

Large internal technology conferences, star parties and team outings.

Flexibility

Working hours are flexible and tailored to individual preferences. As is the mode of work delivery: remotely or in a hybrid model.

They are clear, straightforward and certainly not bumpy. Choose between a managerial or expert development path.

Certifications

We facilitate the development of desired competencies, subsidize training and courses.

Security

We have many years of experience in the market and implement national and international projects. We skillfully manage tasks and enable smooth allocation between projects.

For those who speak fluently and want to maintain this level or wish to develop their language skills, we enable free participation in language lessons. Are conducted in the modern and safe form of online meetings. Just learn IT!

Comfort at work

Attractively decorated relaxation areas, available in the company's largest branches, to encourage relaxation during the day, and equipped kitchens with aromatic coffee.

Support for activity

We have soccer teams, we play championships, we have marathon runners and other active sports lovers on board. We support all passions.