LumApps

Senior Backend Software Engineer

LumApps

full-time

Posted on:

Location Type: Hybrid

Location: Kraków • Poland

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Job Level

Senior

Tech Stack

AWSAzureCloudDistributed SystemsDockerGoogle Cloud PlatformJavaKubernetesMicroservicesMySQLPostgresPython

About the role

  • Design, build, and maintain scalable backend services
  • Help shape the architecture and technical direction of backend systems within the tribe
  • Drive technical initiatives that span multiple teams
  • Write clean, maintainable, and well-tested code
  • Deploy, monitor, and optimize services in production
  • Collaborate with product managers, designers, QA, and engineers to deliver impactful features
  • Mentor engineers and promote strong engineering practices
  • Identify and address technical debt and foundational improvements
  • Help maintain reliable and secure systems, including participation in on-call rotations

Requirements

  • Backend engineering experience
  • Strong experience with Java or Python
  • Experience building microservices and distributed systems
  • Experience designing and building REST APIs
  • Experience with relational databases such as PostgreSQL or MySQL
  • Cloud-native systems
  • Experience with Docker and Kubernetes
  • Experience building systems in AWS, GCP, or Azure
  • Ability to design scalable and maintainable systems
  • Experience driving technical decisions across teams
  • Strong system-level thinking and ability to evaluate architectural trade-offs
  • Experience mentoring engineers and guiding design discussions
  • Strong ownership and attention to detail
  • Commitment to code quality, testing, and maintainability
  • Pragmatic problem solver focused on delivering value
  • Strong communication skills in English.
Benefits
  • Phone & Home Internet costs reimbursement up to 80 PLN/month
  • Private health care package with Luxmed – covered for you and partially for your partner / family
  • Cafeteria benefits – monthly budget to cover sport cards or other purchases
  • Creative Allowance – paid as 1000 PLN gross/month
  • Home office set-up reimbursement up to 1000 PLN
  • 26 days of annual leave/year and 2 Mental Health days off per year
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
JavaPythonmicroservicesdistributed systemsREST APIsPostgreSQLMySQLcloud-native systemsDockerKubernetes
Soft Skills
mentoringstrong ownershipattention to detailpragmatic problem solvingstrong communication skills