Software Engineer
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Before you apply
SalaryPLN 135 – PLN 170/hr
LocationBerlin, Warsaw
Work moderemote · Poland
Typecontract
SenioritySenior
Experience6+ yrs
DepartmentIT & Engineering
Company size1,001–5,000 people
PostedOct 13, 2026 · 3w ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
6+ years of experience as a Software Java and/or Kotlin Engineer
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
Writing clean, performant, well-tested code
Autonomy and ownership in solving technical challenges
Strong communication skills when working with a distributed team
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)
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
Skills
Java
Kotlin
Spring
Spring Boot
Kafka
MySQL
PostgreSQL
Redis
MongoDB
S3
Kubernetes
Docker
GitLab CI
AWS
Terraform
ETL
Snowflake
Rate: 135 – 170 PLN/hour (B2B)
About the role
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
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You’ll collaborate with a distributed, self-organized, cross-functional team
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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
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Drive the development process in an Agile environment, placing Flix users at the center of each solution you and the team create
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Support technical decisions across teams, improving technical excellence through collaboration and lateral leadership
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Help define and deliver products that optimize the coordination between Flix and Mobility Partners, enhancing efficiency and reducing manual tasks
About You
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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
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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
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Cooperation based on a service agreement (B2B/freelance contract), not an employment contract
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You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices
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Location: open for contractors based in Poland