Software Engineer

Flix; United States; Remote; USD 48,000 - 60,000; Full time

Job summary

Flix is seeking an experienced Software Engineer to join on a freelance/service agreement basis (B2B). You will contribute to a critical product ensuring seamless coordination with Mobility Partners across the globe.

We expect 6+ years in Java and/or Kotlin, with distributed systems experience, and a strong product mindset. You will work with Spring Boot, Kafka, and modern data stores, from Poland or globally as a remote contractor.

Qualifications

• 6+ years of Java or Kotlin engineering experience with distributed systems.
• Experience with Spring/Spring Boot, Kafka, databases (MySQL/Postgres, Redis, MongoDB), and S3.
• Ability to architect, write clean, well-tested code, and own technical challenges.
• Strong communication in a distributed team and a data-driven product mindset.

Responsibilities

• Collaborate with a distributed, cross-functional team on product development.
• Co-design new products and improve existing ones using cutting-edge technologies.
• Drive development in an Agile environment with user-centered solutions.
• Support technical decisions and mentor teammates to raise technical excellence.
• Define and deliver products that optimize coordination with Mobility Partners.

Skills

Java

Kotlin

Distributed systems

Spring Boot

Kafka

Databases

English proficiency

Tools

Docker

Kubernetes

GitLab CI

AWS

Terraform

Snowflake

Job description

Rate: 135 – 170 PLN/hour (B2B)

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