Senior Backend Engineer

GLS/NXT

. Design, build, and maintain server-side applications with a focus on performance, scalability, and reliability .

Posted 10/25/2026full-timeBerlin • GermanySeniorWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in Backend Development with a focus on Kotlin, Spring Boot, and SQL, emphasizing performance optimization and scalable architecture. Strong collaboration skills in cross-functional teams, with a commitment to best practices in code quality and security.

Highest-signal resume keywords

Kotlin ProficiencySpring Boot ExperienceSQL and Relational DatabasesREST API Design PrinciplesContainerization and Orchestration (Docker, Kubernetes)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend DevelopmentPerformance OptimizationMicroservices ArchitectureEvent-Driven ArchitecturesCloud-Based Services (AWS)

Soft Skills

Problem-SolvingAnalytical SkillsCommunication Skills

Tools & Technologies

DockerKubernetesKafkaSNS/SQS

Industry Keywords

Agile EnvironmentCross-Functional TeamCode QualitySecurityTesting

Tech Stack

Tools & technologies

AWSCloudDockerKafkaKotlinKubernetesMicroservicesSpringSpring BootSpringBootSQL

About the role

Key responsibilities & impact

Design, build, and maintain server-side applications with a focus on performance, scalability, and reliability
Collaborate with cross-functional teams to define, design, and ship new features and improvements
Drive best practices in code quality, security, and testing across the development lifecycle
Troubleshoot, debug, and upgrade existing software systems proactively and effectively
Stay current with emerging technologies and industry trends to continuously drive innovation within the team

Requirements

What you’ll need

5+ years of proven experience as a Backend Engineer or in a similar role within a cross-functional team environment
Proficiency in Kotlin for backend development
Strong hands-on experience with Spring Boot, building robust and scalable services
Solid experience with SQL and relational databases, including schema design and performance optimization
Experience with event-driven architectures (e.g., Kafka, SNS/SQS)
Proficiency in REST API design principles, microservices architecture, and cloud-based services (preferably AWS)
Experience deploying applications using containerization and orchestration tools (e.g., Docker, Kubernetes)
Comfortable working in an Agile environment, embracing incremental delivery and continuous feedback
Strong problem-solving and analytical skills, with a keen eye for debugging and performance tuning
Excellent written and verbal communication skills in English, with the ability to explain complex technical concepts clearly to diverse audiences

Benefits

Comp & perks

Hybrid working mode with a tailored remote policy
Personal budget (1.000€) for learning and development initiatives
Great office space in Berlin Mitte with top-tier equipment
Clear bonus system enabling participation in your and the team’s performance
Monthly team cooking
Regular events and offsites
30 days of yearly holiday
Rewards for the recommendation of additional team members