08/25/2026 updated
100 % available
Senior Backend Engineer | Java, Kotlin, Spring Boot | Cloud-Native & Microservices
Mostar, USA
Only remote
Bachelor of Information TechnologiesPHPLaravelSpring BootBackendKotlin
Microservices & Distributed Backend Development
Design and development of production-grade microservices architectures using Java, Kotlin, Spring Boot and Spring Cloud, with a focus on scalable, resilient and cloud-native backend systems serving millions of API requests across international markets.
Cloud & DevOps Engineering
Hands-on experience with Docker, Kubernetes, AWS, AWS CDK, GitHub Actions and GitLab CI/CD for automated deployments, infrastructure as code, observability and reliable CI/CD pipelines in enterprise environments.
API Design & Integration
Expertise in designing and implementing REST APIs, GraphQL, gRPC and messaging-based integrations using Kafka, RabbitMQ and OpenFeign, including OAuth2, JWT and API Gateway authentication patterns.
PHP & Laravel Backend Development
Development of multi-tenant SaaS platforms, cloud storage services and loyalty platforms using PHP, Laravel, Symfony and Eloquent ORM, including background processing, payment workflows and role-based access control.
Database Management
Proficiency with relational and NoSQL databases including PostgreSQL, MySQL, MongoDB, MariaDB, Redis and SQLite, covering query optimization, schema design and performance tuning.
Event-Driven Architecture & Messaging
Implementation of event-driven workflows using Kafka and RabbitMQ, supporting asynchronous processing, distributed tracing and resilient service communication in large-scale enterprise platforms.
Testing & Observability
Application of automated testing strategies using JUnit, Mockito, MockK, Testcontainers, WireMock and PHPUnit, combined with observability tooling including Prometheus, Grafana, Loki and Tempo.
Frontend Development
Practical experience with Vue.js, JavaScript (ES6+), HTML5, CSS3 and Blade for full-stack contributions across community and SaaS platforms.
Domain-Driven Design & Clean Architecture
Application of Domain-Driven Design (DDD), Clean Architecture and anti-corruption layer patterns to support large-scale platform migrations and maintainable, modular codebases.
Design and development of production-grade microservices architectures using Java, Kotlin, Spring Boot and Spring Cloud, with a focus on scalable, resilient and cloud-native backend systems serving millions of API requests across international markets.
Cloud & DevOps Engineering
Hands-on experience with Docker, Kubernetes, AWS, AWS CDK, GitHub Actions and GitLab CI/CD for automated deployments, infrastructure as code, observability and reliable CI/CD pipelines in enterprise environments.
API Design & Integration
Expertise in designing and implementing REST APIs, GraphQL, gRPC and messaging-based integrations using Kafka, RabbitMQ and OpenFeign, including OAuth2, JWT and API Gateway authentication patterns.
PHP & Laravel Backend Development
Development of multi-tenant SaaS platforms, cloud storage services and loyalty platforms using PHP, Laravel, Symfony and Eloquent ORM, including background processing, payment workflows and role-based access control.
Database Management
Proficiency with relational and NoSQL databases including PostgreSQL, MySQL, MongoDB, MariaDB, Redis and SQLite, covering query optimization, schema design and performance tuning.
Event-Driven Architecture & Messaging
Implementation of event-driven workflows using Kafka and RabbitMQ, supporting asynchronous processing, distributed tracing and resilient service communication in large-scale enterprise platforms.
Testing & Observability
Application of automated testing strategies using JUnit, Mockito, MockK, Testcontainers, WireMock and PHPUnit, combined with observability tooling including Prometheus, Grafana, Loki and Tempo.
Frontend Development
Practical experience with Vue.js, JavaScript (ES6+), HTML5, CSS3 and Blade for full-stack contributions across community and SaaS platforms.
Domain-Driven Design & Clean Architecture
Application of Domain-Driven Design (DDD), Clean Architecture and anti-corruption layer patterns to support large-scale platform migrations and maintainable, modular codebases.
Experience
Professional experience5 - 10 years
Freelancer since2017
Languages
GermanFluentEnglishFluentBosnianNative speaker
Project history
Leading backend engineering and DevOps efforts across multiple enterprise projects including the Mercedes-Benz Digital Commerce Platform, an Enterprise Commerce Platform and a Cloud-Native Healthcare Platform. Responsibilities include designing microservices, API orchestration, cloud deployments and cross-team technical collaboration in SAFe environments.
Worked across multiple projects including OpenDrive (a Dropbox-like cloud storage service), a Business Management SaaS Platform, AladdinMiles (a global loyalty and rewards platform) and Team RWB (a community engagement platform). Responsibilities spanned backend development, DevOps, CI/CD, API design and full-stack contributions using PHP, Laravel, Docker and related technologies.