Software Engineer

Flix; Warszawa; Remote; PLN 180,000 - 300,000; Full time

Job summary

Flix is seeking an experienced Software Engineer to join on a freelance/service agreement basis (B2B). You will work on a critical product central to the Flix ecosystem, coordinating with Mobility Partners to keep millions of passengers moving globally.

You’ll contribute to architecture, scale the product, and explore AI-driven solutions while collaborating with a distributed team in an Agile environment. This role emphasizes ownership, high-quality code, and user-focused outcomes.

Qualifications

• 6+ years of experience as a Software Java and/or Kotlin Engineer, with knowledge of distributed systems, including Spring/Spring Boot, Kafka, MySQL/Postgres, Redis, MongoDB and S3
• Willingness to work with both Java (for existing products) and Kotlin (for new ones)
• Experience in making architectural decisions, and writing clean, performant, well-tested code
• Autonomy and ownership in solving technical challenges, as well as strong communication skills when working with a distributed team
• A strong product mindset, with a passion for user experience and a data-driven approach to decision-making
• Experience in coding with AI
• Fluent in English (upper-intermediate or higher)

Responsibilities

• Collaborate with a distributed, self-organized, cross-functional team
• Co-design new products from the ground up while continuously improving existing ones, with room to explore and implement cutting-edge technologies
• Drive the development process in an Agile environment, placing Flix users at the center of each solution you and the team create
• Support technical decisions across teams, improving technical excellence through collaboration and lateral leadership
• Help define and deliver products that optimize the coordination between Flix and Mobility Partners, enhancing efficiency and reducing manual tasks

Skills

Java

Kotlin

Distributed systems

Spring Boot

Kafka

MySQL/Postgres

Redis

MongoDB

S3

Fluent English

English

Tools

Kubernetes

Docker

GitLab CI

AWS

Terraform

Snowflake

Job description

We are looking for an experienced Software Engineer to join Flix on a freelance/service agreement basis (B2B contract). The team owns a critical product at the heart of the Flix ecosystem - optimizing how Flix coordinates with Mobility Partners to keep millions of passengers moving across the globe.

Scope of Services

You’llhave areal impact, contributing not just to code, but to product and technical decisions that directly impact the business. With your servicesyou’ll maintain and continuously evolve a mature, stable product while simultaneously pushing it forward - tackling complex architectural challenges, reducing manual processes, and exploring AI-driven solutions.

About the Engagement

• You’ll collaborate with a distributed, self-organized, cross-functional team
• You’ll have the opportunity to co-design new products from the ground up while continuously improving existing ones, with room to explore and implement cutting-edge technologies
• Drive the development process in an Agile environment, placing Flix users at the center of each solution you and the team create
• Support technical decisions across teams, improving technical excellence through collaboration and lateral leadership
• Help define and deliver products that optimize the coordination between Flix and Mobility Partners, enhancing efficiency and reducing manual tasks

About You

• 6+ years of experience as a Software Java and/or Kotlin Engineer, with knowledge of distributed systems, including Spring/Spring Boot, Kafka, MySQL/Postgres, Redis, MongoDB and S3
• Willingness to work with both Java (for existing products) and Kotlin (for new ones)
• Experience in making architectural decisions, and writing clean, performant, well-tested code
• Autonomy and ownership in solving technical challenges, as well as strong communication skills when working with a distributed team
• A strong product mindset, with a passion for user experience and a data-driven approach to decision-making
• Experience in coding with AI
• Fluent in English (upper-intermediate or higher)

Nice-to-Haves

• Experience with DevOps and infrastructure: Kubernetes, Docker, Gitlab CI, AWS, Terraform
• Familiarity with data engineering (ETL, Snowflake)
• Ability to be a sparring partner , share knowledge and experience, explain complex things in plain language, consult/ mentor, and provide constructive feedback

Cooperation Model

• Cooperation based on a service agreement (B2B/freelance contract), not an employment contract
• You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices
• Location: open for contractors based in Poland