Software Engineer

FlixTrain is hiring a Software Engineer for a remote role open to applicants in Poland. Level rates it ; you can apply on FlixTrain.

Level's read on this job

On Level's scale, this software engineer role is Uses AI ●●○○: an ordinary role that requires AI tools.
The posting lists this role as remote.
Tools and skills the posting cites include Java, Kotlin and Spring Boot.
Level lists 127 other open roles at FlixTrain.
The role was posted within the past two weeks.

AI in this role

Senior Software Engineer using Java and Kotlin to build distributed backend systems with expectations of utilizing AI coding tools.

javakotlinspring-bootkafkamysqlpostgresredismongodbawskubernetesdockerterraform+1

distributed-systemsbackendarchitectureapiagile

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'll have a real impact, contributing not just to code, but to product and technical decisions that directly impact the business. With your services you’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

How we rate this

Software Engineer at FlixTrain rates 45 out of 100 for how much of the daily work is AI. That makes it Uses AI (AI Level 2 of 4). The level is about AI in the job, not seniority.

Classification

Uses AI. An ordinary role that requires AI tools.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.

Key facts

Software Engineer is an open job at FlixTrain.
Level rates this role AI Level 2 of 4: Uses AI.
The role is based in Warsaw and is marked remote.
The job was posted on October 13, 2026.
Seniority: senior.
Applications are handled by FlixTrain. Apply on FlixTrain

Prepare for this job

Built from this posting and from similar jobs on Level.

Skills and AI tools this role asks for

Distributed SystemsBackendArchitectureAPIAgileJavaKotlinSpring Boot

Also common in software engineer jobs at this level

Python React TypeScript C++JavaScript SQL

Pay

Typical software engineer job: $168k

This posting doesn't list pay. Use the typical software engineer figure when pay comes up. See software engineer jobs

Questions you could be asked

Tell me about a project where distributed systems was part of your work. What did you do?
Tell me about a project where backend was part of your work. What did you do?
Tell me about a project where architecture was part of your work. What did you do?
Tell me about a project where api was part of your work. What did you do?
Tell me about a project where agile was part of your work. What did you do?

Adapt your resume

List these exact terms on your resume: Distributed Systems, Backend, Architecture, API, and Agile. An applicant tracking system matches the wording, not the idea.
Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.
Put the AI tool in a bullet point about what you did, not just in a skills list. This role treats it as a required part of the job.

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