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Freelance Senior Backend Engineer - Kotlin (m/f/d)
Build and maintain Kotlin-based backend integrations that connect voize with senior care and hospital software platforms, enabling smoother data flow and reducing admin work for caregivers.
Senior Android Engineer
Leads Android development for a fitness app, focusing on scalable, high-quality mobile solutions. Core tech: Kotlin, Jetpack Compose, architecture patterns, and cross-team collaboration.
Android BSP Engineer
Develops and maintains Android’s kernel and driver layer for embedded payment terminals, integrating hardware with Stripe’s in-person payment systems.
Android Engineer, Terminal
Build Android apps and SDKs in Kotlin for Stripe Terminal devices, enabling in-person payments and extending Stripe's financial infrastructure to physical retail.
React Native Engineer, Merchant Experience Mobile
Senior React Native Engineer at Stripe in Barcelona building mobile applications for merchants. Work with React Native, TypeScript, and JavaScript to develop high-performance mobile experiences, own architectural decisions, and mentor other engineers.
Mission-Critical Backend Engineer | Java/Kotlin + Spring Boot
Develops backend features for a mission-critical system (HaMIS) using Java/Kotlin/Spring Boot, focusing on REST/SOAP integrations, microservices, and automated testing while adhering to clean architecture principles.
Medior Backend Developer
Builds and maintains mission-critical backend services for a Harbour Master system using Java/Kotlin, Spring Boot, and microservices, focusing on secure integrations and 24/7 reliability.
Back-end Developer (Java)
Build and maintain a 24/7 mission-critical port-management system in Java/Kotlin with Spring Boot, integrating with external partners via APIs and messaging while ensuring reliability and observability.
Medior Backend Developer Java/Kotlin | Spring Boot
Medior Backend Developer working on a mission-critical 24/7 Port Call Management system (HaMIS) in Rotterdam, responsible for development, integrations, and production operations using Java, Kotlin, and Spring Boot.
Android Engineer, Terminal OS Platform
Builds Android apps and SDKs in Kotlin for Stripe Terminal, enabling in-person payments on custom hardware devices and frameworks for internal/external developers.
Technical Solutions Engineer
Technical Solutions Engineers at Stripe help developers integrate and troubleshoot Stripe's payment infrastructure, working across multiple programming languages and providing documentation and support.
Senior Xamarin Mobile Developer
Senior Xamarin Mobile Developer role developing cross-platform iOS/Android apps using Xamarin.iOS and Xamarin.Android, working with teams to deliver products, fix bugs, and contribute to architecture.
Senior IT Java Developer
Senior Java Developer building Data and Analytics solutions at Group Finance, using Java 17+, Spring, and technologies like SQL, GIT, Kotlin, Kafka, Docker, Kubernetes.
Senior Software Engineer (Android)
Senior Android Engineer leads development of high-quality mobile apps for Delivery Hero’s ecommerce platform, focusing on modern Android architectures, testing, and scalable solutions to enhance user experience and system performance.
Senior Fullstack Mobile Engineer
Build and maintain Fundraise Up’s React Native iOS/Android apps for contactless donations, integrating Stripe Terminal and payment systems while owning full-stack features end-to-end.
Staff Full-Stack Engineer
Staff Full-Stack Engineer responsible for end-to-end ownership of a web-based database application, working with Java, Spring, and AWS technologies. The role involves technical design, backend and database development, front-end delivery, deployment, and production support.
Security Engineer, Application Security
About GameChanger: We believe in the life changing impact youth sports have on and off the field. Sports encourage leadership, teamwork, responsibility, and confidence – important life lessons that have the power to…
Software Engineer
Software Engineer at Nextdoor develops backend services for large-scale consumer systems using Python, Java, Kotlin, Django, Spring, and deploys with Docker/Kubernetes. Collaborates with cross-functional teams and uses AI tools in workflow.