Senior Backend Engineer (Java/Kotlin) - Remote

Traffit; Wrocław; Hybrid; PLN 262,000 - 279,000; Full time

Benefits offered by this job

Fully remote

Office in Wrocław

Luxmed

Multisport

Life insurance (Nationale Nederlanden)

Personal Training Budget

Passion Day

Flexible working hours

2 extra monitors

Job summary

Holisticon Connect in Poland is seeking a Senior Backend Software Engineer (Java/Kotlin) to join an international product company building a cloud-native enterprise SaaS platform. The role emphasizes scalable microservices, strong system ownership and long-term maintainability.

You will design APIs, drive architectural decisions, and own services through their lifecycle from design to production telemetry. Remote work or in-office in Wrocław options are available.

Qualifications

• 5+ years of professional backend development experience.
• Strong commercial experience with Java and Kotlin.
• Understanding of object-oriented programming, design principles and clean code.
• Experience designing REST APIs and backend integrations.
• Experience building production-grade backend applications.
• Good understanding of distributed systems and modern backend architecture.
• Experience with relational databases and SQL.
• Strong knowledge of Git.
• Experience with automated testing and modern software engineering practices.
• Ownership mindset and ability to work independently.
• Fluent English and Polish for collaboration.
• Located in Poland for at least 5 years.

Responsibilities

• Architect, build and maintain high-throughput, resilient backend microservices in Java or Kotlin.
• Drive technical decisions and system design, author RFCs, evaluate trade-offs.
• Design and evolve robust APIs (REST, event contracts) and integration layers for enterprise clients.
• Own the full service lifecycle from conception, CI/CD automation to deployment and monitoring.
• Optimize performance, concurrency, fault tolerance and resource utilization in distributed components.
• Foster engineering excellence through code reviews, architecture discussions, and testing standards.
• Collaborate with Product Managers, Platform/DevOps, and QA to translate requirements into clean domain models.
• Identify technical debt and lead modernization across tooling and pipelines.

Skills

Java/Kotlin

REST APIs

Distributed systems

SQL

Git

Automated testing

Cloud (AWS/Azure/GCP)

Docker/Kubernetes

Spring Boot

English & Polish

Tools

Docker

Kubernetes

CI/CD pipelines

AWS

Azure

GCP

Job description

Holisticon Connect in Poland is seeking a Senior Backend Software Engineer (Java/Kotlin) to join an international product company building a cloud-native enterprise SaaS platform. The role emphasizes scalable microservices, strong system ownership and long-term maintainability.

You will design APIs, drive architectural decisions, and own services through their lifecycle from design to production telemetry. Remote work or in-office in Wrocław options are available.