Remote Backend Engineer for APIs (Java/Kotlin, AWS)

Masabi; Województwo mazowieckie; Remote; PLN 180,000 - 240,000; Full time

Job summary

Masabi is hiring Backend Developers to build and evolve the services at the heart of the Justride platform. You will work on cloud-native, event-driven systems that run at scale for transit agencies worldwide, from fare and ticketing logic to APIs and integrations that connect riders, operators and partners.

As part of a cross-functional team, you'll collaborate with engineers, testers and product partners to take features from idea to production, shaping the rider experience every day.

Qualifications

• Clear, confident communication in written and spoken English.
• Solid commercial experience building backend systems in Java or Kotlin.
• Understanding of distributed systems and how to build for scale and reliability.
• Comfortable designing and working with REST APIs and service-based or event-driven architectures.
• Hands-on experience with cloud platforms, ideally AWS.
• A thoughtful approach to code quality, testing and maintainability.
• Collaborative and team-oriented, happy to share knowledge and learn from others.
• Strong problem-solving skills and a proactive mindset.
• Able to explain technical ideas clearly to both technical and non-technical colleagues.

Responsibilities

• Build and maintain backend services and APIs that power core parts of the Justride platform.
• Contribute to the design of scalable, secure and resilient distributed systems.
• Collaborate with cross-functional teams to deliver features from concept through to production.
• Write clean, well-tested, maintainable code and contribute to code reviews and shared engineering standards.
• Build and support integrations with internal services and third‑party systems.
• Monitor and improve the performance, reliability and observability of the services you own.
• Contribute to technical discussions and help shape solutions and best practices.
• Take ownership of your work and support team outcomes.

Skills

English proficiency

Java

Kotlin

Distributed systems

REST APIs

AWS

Code quality

Team collaboration

Problem solving

Communication

Tools

AWS

Kafka

Terraform

Grafana

Gradle

Maven

Git

DynamoDB

S3

SQS

EC2

ECS

Job description

Masabi is hiring Backend Developers to build and evolve the services at the heart of the Justride platform. You will work on cloud-native, event-driven systems that run at scale for transit agencies worldwide, from fare and ticketing logic to APIs and integrations that connect riders, operators and partners.

As part of a cross-functional team, you'll collaborate with engineers, testers and product partners to take features from idea to production, shaping the rider experience every day.