11,088 Kotlin jobs
Open roles that use Kotlin for Android and JVM backends.
Java Backend Engineer
Java backend engineer who builds, maintains, and improves scalable applications and services with end-to-end ownership — design, deployment, monitoring, on-call production support, and incident troubleshooting. Core stack: Java, Spring Boot, MySQL, Kafka, and Kubernetes.
Senior Backend Developer bij de DSO-team Hecate
Senior backend developer on the DSO team Hecate, working on Donna — the mission-critical system that creates train timetables for all Dutch rail carriers. You design distributed microservices in Java 17/Spring Boot on OpenShift and own the full DevOps cycle; excellent written and spoken Dutch is required.
Senior Backend Developer bij de DSO-team Hecate
Senior backend developer (contract until 30-11-2028, max €98/hr) on NS Dutch Railways' DSO team Hecate in Utrecht, modernizing Donna, the critical system that plans timetables for all Dutch trains. Day to day you design, build, deploy and monitor Java/Kotlin Spring Boot microservices in a DevOps Scrum team.
Senior Backend Developer bij de DSO-team Hecate
Senior backend developer on NS's DSO team Hecate in Utrecht, modernizing the Donna train-scheduling system by breaking a 1.6M-line Java monolith into microservices. You design and build distributed Spring Boot/Kotlin services and deploy and monitor them on OpenShift in a 2-week Scrum/DevOps cycle.
Senior Backend Developer – Microservices voor Railsplanning
Senior backend developer at NS (Dutch national railway) in Utrecht, on DSO team Hecate, renewing Donna — a large, complex train timetabling/planning application. Day-to-day: building microservices with Java 17+, Kotlin, and Spring Boot, deployed on Kubernetes in a DevOps culture.
Principal Android Engineer (Contract, Outside IR35)
Contract (outside IR35, ~6 months from Jan 2027) Principal Android Engineer at digital product consultancy hedgehog lab. You lead the technical side of a team building a UK bank's Android app and drive its migration from XML/Data Binding to Jetpack Compose, while staying hands-on in Kotlin/Compose (MVVM, Hilt/Dagger), mentoring engineers and setting coding, testing and review standards.
Senior Java Software Engineer
Senior/lead Java developer (5+ years) who designs and ships scalable microservices for an investment-banking client in Warsaw, using Core Java, Spring, Kotlin, Flink, Kafka, Kubernetes, AWS and gRPC. Permanent/B2B hire, hybrid with 3 days a week in the Warsaw office.
Senior Android Engineer (Contract, Outside IR35)
Six-month outside-IR35 contract (starting January 2027, remote-first) with hedgehog lab's consultancy team, delivering a UK bank's customer-facing Android app as it migrates to Jetpack Compose. Day to day: building Compose UI, maintaining and migrating XML screens, Kotlin/MVVM with Hilt and Dagger, REST APIs, and unit testing with JUnit and MockK.
Camunda Engineer
Contract Camunda 8 engineer (via staffing firm ITech Consult AG) for a new digital client-onboarding and bank-product origination platform in Zürich: designs business processes with Camunda 8 and builds Java backend and Angular frontend services in a DevOps team. Hybrid on-site within Switzerland; German C1 and English B2 required.
Senior eBanking Java & Angular Developer
ITech Consult AG, a Swiss IT contract-placement firm, is staffing a senior developer for a banking software project in Zürich: building and architecting business-critical, high-load eBanking applications with Java, Kotlin, and microservices in SAFe/Scrum agile teams. 80-100% workload, hybrid within Switzerland only, planned through late 2028.
Principal Software Engineer - Mobile Applications
Hands-on technical lead for Android and iOS apps supporting Boston Scientific's medical devices: owns architecture, mobile-to-backend/cloud integration, and BLE device connectivity under regulated (FDA/IEC 62304) processes, while mentoring mobile engineers and driving engineering best practices. Hybrid role, at least three days per week in office.
Software Engineer z j. niemieckim - Pricing&Transactions - B2B
B2B backend engineer for dmTECH's Pricing & Transactions team, building cloud-based Java/Kotlin/Spring systems that handle dm drugstore transactions — carts, discounts, coupons, and country-specific fiscalization — across checkout, self-checkout, and online channels. Hybrid in Wrocław or 100% remote; requires Polish C1, German, and English B2.
Full Stack Developer
Accenture Federal Services is hiring a Full Stack Software Engineer to architect and build mission-critical applications for US federal government programs, including classified environments. Day to day the role designs APIs, microservices, and front/back-end systems using languages like Python, Java, or Go, modern frameworks like React or Vue, databases like Postgres or MongoDB, and cloud/contain
Senior Software Engineer, Mapping
Senior engineer at ALSO (an electric mobility startup spun out of Rivian) building the end-to-end navigation experience for its small EVs — from the C++/Valhalla routing engine and AWS cloud services to Python/JS tooling and iOS/Android/mobile integrations, on-site in Palo Alto.