Backend Engineer – Kotlin/Java, Microservices & AI Tools

thecodest; Warszawa; On-site; PLN 167,000 - 223,000; Full time

Benefits offered by this job

Worksmile platform

Growth opportunities

Competitive PLN salary

Job summary

The Codest in Warsaw is seeking a Senior Backend Engineer to design, develop, and maintain scalable services using Kotlin, Java and Spring Boot. You will work on a microservices architecture and collaborate with cross-functional teams to deliver high-quality APIs.

You’ll leverage MongoDB, GCP, and AI-assisted coding tools to accelerate delivery while upholding best practices. The role offers growth, a B2B contract, and a vibrant, international team.

Qualifications

• Proficiency in Kotlin and Java backend development.
• Experience with microservices design and deployment.
• Strong API design and testing.
• Ability to work with cross-functional teams.
• Familiarity with cloud platforms (GCP) and MongoDB.
• Experience with AI-assisted development tools.
• Commitment to engineering best practices.
• Proven track record of writing high-quality, maintainable code.

Responsibilities

• Design, develop, and maintain scalable backend services and APIs.
• Build microservices-based solutions focusing on reliability and performance.
• Architect new modules and guide key technical decisions.
• Optimize existing systems for scalability and code quality.
• Collaborate with Product, Data Analysts, and UX Designers.
• Work with MongoDB, Spring Data MongoDB, and GCP.
• Write tests and ensure high-quality, well-tested code.
• Contribute to frontend or mobile tasks when needed.
• Follow engineering best practices and CI/CD processes.

Skills

Kotlin

Java

Spring Boot

Microservices

Backend APIs

AI Tools

GCP

MongoDB

Team Collaboration

Code Quality

Tools

MongoDB

Spring Data MongoDB

Google Cloud Platform (GCP)

Job description

The Codest in Warsaw is seeking a Senior Backend Engineer to design, develop, and maintain scalable services using Kotlin, Java and Spring Boot. You will work on a microservices architecture and collaborate with cross-functional teams to deliver high-quality APIs.

You’ll leverage MongoDB, GCP, and AI-assisted coding tools to accelerate delivery while upholding best practices. The role offers growth, a B2B contract, and a vibrant, international team.