Java Software Engineer - FinTech

Flix is hiring a Java Software Engineer - FinTech for a remote role open to applicants in Poland. It pays $89-$119/hr and Level rates it ; you can apply on Flix.

Level's read on this job

Level rates this software engineer role Little AI ●○○○: aI is not part of the work.
The posting lists this role as remote.
Tools and skills the posting cites include Java, Kafka and AWS.
Level lists 124 other open roles at Flix.
The role was posted within the past week.

AI in this role

Build and maintain internal Java-based backend applications and event-driven data processing workflows for a fintech platform.

javakafkaawsdockerkubernetessnowflakereact-jsangularsqldatadog

backend-developmentevent-driven-architectureci-cdinfrastructure-as-code

Rate: 89 – 119 / hour (B2B)

We are looking for a skilled Java Engineer to join Flix on a freelance/service agreement basis (B2B contract). This is a contractor engagement to work on impactful, hands-on challenges in the domain of financial technology.

Scope of Services

Bring expertise in Java-based backend development. Work across Flix's finance technology environment to build and maintain critical internal applications — from revenue accounting, invoices processing to bus partner settlements and payment reconciliation.

About the Engagement

Design, build, and maintain features for the internal data-heavy applications, supporting automated bus partner settlement generation across all FlixBus entities around the globe.
Develop and enhance the internal services that allow finance and billing teams to manage bus partners' settlement-relevant data and track changes via event history.
Communicate directly with business counterparts (finance, billing, and partner teams) to understand needs and shape solutions.
Actively participate in product development, from refinement and technical design through delivery and operations.
Implement and maintain event-driven data processing workflows using Kafka to support settlement operations.
Contribute to infrastructure-as-code practices and CI/CD pipelines on AWS, and run services on Docker/Kubernetes, with monitoring and observability (e.g. Datadog).

About You

At least 3 years of experience as a Software Engineer, with exposure to data processing systems
Proven experience working with Java in a commercial environment
Experience with event-driven architectures, ideally Kafka
Experience working with cloud-based infrastructure providers, ideally AWS
Solid SQL knowledge
Hands-on experience with Docker and Kubernetes (or similar container orchestration tools) and CI/CD
Familiarity with Snowflake or similar data warehousing solutions is a plus
Experience in front-end technologies (e.g., JavaScript, HTML5, React.js, or Angular) is a plus
Fluent in English

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

Java Software Engineer - FinTech at Flix rates 0 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

●●●● 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

Java Software Engineer - FinTech is an open job at Flix.
Level rates this role AI Level 1 of 4: Little AI.
The listed pay is $89-$119/hr.
The role is based in Warsaw and is marked remote.
The job was posted on October 28, 2026.
Seniority: mid.
Applications are handled by Flix. Apply on Flix

Prepare for this job

Built from this posting and from similar jobs on Level.

Skills and AI tools this role asks for

Backend DevelopmentEvent Driven ArchitectureCI/CDInfrastructure As CodeJavaKafkaAWSDocker

Also common in software engineer jobs at this level

Python C++TypeScript Azure C#Google Cloud

Pay

Typical software engineer job: $168k

Use the typical software engineer figure as a reference when pay comes up. See software engineer jobs

Questions you could be asked

Tell me about a project where backend development was part of your work. What did you do?
Tell me about a project where event driven architecture was part of your work. What did you do?
Tell me about a project where ci/cd was part of your work. What did you do?
Tell me about a project where infrastructure as code was part of your work. What did you do?
Walk me through how you've used Java in your day-to-day work.

Adapt your resume

List these exact terms on your resume: Backend Development, Event Driven Architecture, CI/CD, Infrastructure As Code, and Java. 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.

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