Senior Software Engineer

B3 Consulting Poland; Polska; Híbrido; PLN 180 000 - 260 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

Health and sports benefits

Speed Coaching

Sports training & internal team

Team events & meetups

Resumo da oferta

Senior Software Engineer at B3 Consulting Poland will design and scale backend microservices for the merchant payments domain, building core services for prepaid wallets, payment gateway integrations, invoicing, and reporting.

You will migrate legacy services to Clean Architecture and Hexagonal Architecture, build event-driven integrations over REST and Kafka with Avro, and own full lifecycle deployment using Helm, GitLab CI, and Kubernetes.

Qualificações

• Backend microservices with Java/Kotlin, Spring Boot, Clean/Hexagonal Architecture
• Event-driven with Kafka and Avro, REST integrations
• Knowledge of monetary calculations and PII protection
• Testing with Spock and Testcontainers
• GitOps and DevOps with Helm, GitLab CI, Kubernetes
• Experience with AI-assisted coding tools (Claude Code, GitHub Copilot, Cursor, Codex)

Responsabilidades

• Design and deliver backend microservices in the merchant payments and reporting domain, including prepaid wallets, invoicing, and SAP / payment gateway integrations.
• Migrate legacy services to Clean Architecture and Hexagonal Architecture, documenting decisions with Architecture Decision Records.
• Build event-driven integrations over REST and Kafka with Avro, ensuring idempotency and correct money handling.
• Own full lifecycle deployment and quality using Helm, GitLab CI, GitOps on Kubernetes, and testing with Spock, Testcontainers, and Spring Cloud Contract.

Conhecimentos

Java/Kotlin

Spring Boot

Microservices

Clean Architecture

Hexagonal Architecture

Kafka

REST

Monetary calculations

PII protection

Spock/Testcontainers

GitOps

Kubernetes

DevOps practices

AI-assisted coding tools

agentic coding tools

Ferramentas

Kafka

Avro

Spock

Testcontainers

Spring Cloud Contract

Helm

GitLab CI

Kubernetes

Claude Code

GitHub Copilot

Cursor

Codex

Descrição da oferta de emprego

We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we work with full autonomy. We independently choose our technologies, processes, and ways of working while maintaining the highest professional standards.

We deliver a wide range of IT projects in Poland and internationally, across multiple domains and technologies. This allows our consultants to develop their competencies and gain experience aligned with their professional ambitions.

Our collaboration is built around the CARE philosophy. For us, it means responsible project matching, transparent cooperation, and a long-term approach to professional growth.

Senior Software Engineer

In this role, you will design and scale backend microservices for the merchant payments domain, building core services for prepaid wallets, payment gateway integrations, invoicing, and reporting

Grow in an environment that cares about your development as much as you do.

Your responsibilities

• Design and deliver backend microservices in the merchant payments and reporting domain, including prepaid wallets, invoicing, and SAP / payment gateway integrations.
• Migrate legacy services to Clean Architecture and Hexagonal Architecture, keeping domain logic framework-free and documenting choices via Architecture Decision Records.
• Build event-driven integrations over REST and Kafka with Avro, enforcing idempotency and money handling correctness.
• Own full lifecycle deployment and quality using Helm, GitLab CI, GitOps on Kubernetes, and testing with Spock, Testcontainers, and Spring Cloud Contract.

Requirements

• Experience with backend microservices using Java or Kotlin, Spring Boot, Clean Architecture, and Hexagonal Architecture.
• Experience with event-driven architecture using Kafka and Avro, alongside REST integrations.
• Knowledge of financial logic handling, including idempotent endpoints, precise monetary calculations, and PII protection.
• Experience with testing and quality tools using Spock, Testcontainers
• Experience with GitOps and DevOps practices using Helm, GitLab CI, and Kubernetes.
• Experience using AI-assisted and agentic coding tools (such as Claude Code, GitHub Copilot, Cursor, or Codex)
• You need to live in Poland and/or be eligible to work here.

What we offer

• Work in a Scandinavian culture built on logic and dialogue.
• Health and sports benefits tailored to your needs.
• Speed Coaching – short sessions that provide new perspectives and solutions.
• Sports training, an internal team, and opportunities to take part in competitions.
• Team events and development-focused meetups.