1 to 25 of 45 Kotlin Jobs in the City of London

VIPER architecture alongside modern Android best practices. Ensure high-quality, maintainable code and scalable solutions. Required Skills & Experience Proven experience leading Android teams and mentoring developers. Deep expertise in Kotlin , Java , RxJava , and Jetpack Compose . Strong understanding of Android architecture patterns (including VIPER , MVVM, and Clean Architecture), asynchronous programming, and UI/UX best practices. Hands-on experience More ❯

with Java Good understanding of JVM (memory model, concurrency, data structures) Spring framework, Spring Boot Maven Knowledge of REST APIs & Microservices MongoDB JUnit and TDD Nice to haves: AWS Kotlin Git Pipelines Javascript, React Redis Knowledge of Linux Key Details Reporting to: CTO Hours: Full time Location London - Hybrid WFH model, x2 days a week onsite (Wed/Thurs More ❯

technical excellence What you'll bring Deep extensive experience of Android application development Established and highly skilled in all aspects of software engineering Strong programming skills in Java and Kotlin Solid understanding of Android architecture patterns and best practices Experience with video streaming protocols (HLS, DASH) Familiarity with ExoPlayer (bonus) Agile development experience with CI/CD pipelines Strong More ❯

in native Android development, with a strong portfolio of shipped, consumer-facing applications. ? Required Technical & UI/UX Skills ? Deep expertise in native Android UI/UX development, including Kotlin and modern frameworks (e.g., Jetpack Compose, Coroutines, Flow). ? Demonstrated experience building complex, real-time, data-intensive user interfaces (e.g., chat applications, financial dashboards, real-time streaming apps). More ❯

opportunity to carve out the future, including your role in a growing and ambitious business. We would love to hear from you if 👇 ✅You bring deep technical expertise in Kotlin, Jetpack Compose, concurrency (coroutines/flows), persistence (Room/Realm), architecture patterns (MVVM/MVI), and testing - and are motivated by solving challenging technical problems. ✅ You’re an Android More ❯

including AWS design, security, and observability. Mentoring colleagues, conducting code reviews, and supporting a culture of learning and improvement. Candidate Profile Significant experience in modern Java development (Spring Boot, Kotlin, or similar). Strong track record in designing and evolving scalable, Cloud-based systems. Practical experience with iterative development, automated testing, and CI/CD. A pragmatic and collaborative More ❯

on development in React Native, where you will refactor and merge codebases from acquisitions, transitioning iOS components written in Objective-C or Swift and Android elements in Java or Kotlin into a cohesive cross-platform structure. This involves optimising for faster startup times, implementing native bridges for features requiring direct hardware access, such as geolocation services using Core Location More ❯

for iOS and Android. Collaborate closely with product, design, and backend teams to deliver seamless, visually polished experiences. Integrate and extend React Native functionality with native modules (Swift or Kotlin) when required. Own app store releases and ensure smooth deployment and maintenance processes. Monitor production performance using tools for crash reporting, analytics, and logging. Help shape architecture and tooling More ❯

digital programmes. Key Responsibilities Lead the design, development, and delivery of enterprise-scale digital solutions. Work hands-on with modern technologies across multiple OOP languages (e.g. Java, C#, Python, Kotlin, or similar). Define technical architecture and mentor engineering teams through best practice, clean code, and agile delivery. Collaborate closely with product, design, and delivery leads to shape technical More ❯

Enhance and maintain a mission-critical global codebase 🔹 What they're looking for 5+ years' software engineering experience (3+ in financial markets/algos) Strong coding skills in Java, Kotlin, C#, or C++ (Python a plus) Hands-on experience with real-time data processing & distributed systems Strong understanding of software engineering and system architecture A proactive problem-solver with More ❯

experience. Strong proficiency in high-performance Python, with a deep understanding of its ecosystems and best practices. Prior experience with at least one JVM-based language such as Java, Kotlin, or Scala is a plus. Solid understanding of distributed systems principles and experience working with distributed architectures. Experience with containerization technologies (e.g., Docker, Kubernetes). Experience working in a More ❯

AI is integrated into production workflows • Embedding engineering excellence and best practices across teams You’ll bring: • Proven experience designing large-scale, cloud-based systems (Python and Rust or Kotlin). • A track record of leading cross-functional initiatives with measurable business impact • A product mindset, you need to be able to balance technical vision with pragmatic delivery • Experience More ❯

mentor engineers across a cross-functional team Work closely with product managers and business stakeholders to align technical direction with strategic goals Write high-quality, production-ready code using Kotlin or Java Lead by example through code reviews, architectural decisions, and continuous delivery practices Drive improvements in engineering practices, tooling, and team workflows Help scale backend infrastructure to meet More ❯

frontend applications in React or React Native with hands-on knowledge of secure API design and authentication services. Experience in Java and Spring Boot, or iOS (Swift) or Android (Kotlin) along with exposure to Figma and Vercel is a big plus. Capable of writing clean, maintainable and well-tested code. Comfortable working in on-prem and cloud-native environments … paced, regulated environments where we ship at speed, embrace change, and never stop evolving. Your Technical Toolkit React/React Native/TypeScript JavaScript/iOS (Swift) or Android (Kotlin) RDBMS (Oracle/Sybase)/NoSQL databases (Document DB) AWS and cloud-native microservices containerised architecture (e.g. K8s, Docker) Modern software engineering practices with CI/CD pipelines and More ❯

frontend applications in React or React Native with hands-on knowledge of secure API design and authentication services. Experience in Java and Spring Boot, or iOS (Swift) or Android (Kotlin) along with exposure to Figma and Vercel is a big plus. Capable of writing clean, maintainable and well-tested code. Comfortable working in on-prem and cloud-native environments … at speed, embrace change, and never stop evolving. Your Technical Toolkit React/React Native/TypeScript Java (21) and Spring Boot/JavaScript/iOS (Swift) or Android (Kotlin) RDBMS (Oracle/Sybase)/NoSQL databases (Document DB) AWS and cloud-native microservices containerised architecture (e.g. K8s, Docker) Modern software engineering practices with CI/CD pipelines and More ❯

not expected to code in production daily, but able to get into the detail where required). Experience across modern web and mobile stacks – ideally NodeJS, React, Flutter, Swift, Kotlin, GCP/AWS. Demonstrated ability to deliver complex product roadmaps on time and at scale. Commercial and product-minded – able to connect technology decisions with business value. Inspirational leadership More ❯

Experienced engineering leader with 6+ years leading multiple teams in product-driven environments. Strong technical background in cloud and distributed systems (experience with JVM languages like Java, Scala or Kotlin a bonus). Proven experience integrating AI/ML into live systems with measurable business outcomes. Excellent architectural judgement and a pragmatic approach to scaling systems and teams. Comfortable More ❯

Investment, Asset, or Wealth Management. Proven track record of leading frontend and mobile engineering teams , delivering high-quality applications in React/React Native , Swift (iOS) , and/or Kotlin (Android) . Strong understanding of secure API integration , authentication flows , and modern UI/UX architecture . Comfortable guiding teams through design implementation , collaborating with product and design using … improvement . Thrives in fast-paced, regulated environments where speed, compliance, and innovation go hand-in-hand. Your Technical Toolkit React/React Native/TypeScript Swift (iOS)/Kotlin (Android) JavaScript/HTML/CSS Figma/Git Testing frameworks : Jest, Cypress, XCTest, Espresso CI/CD pipelines : GitHub Actions, CircleCI, Bitrise Cloud-native architecture : AWS, Docker, Kubernetes More ❯

or React Native , with hands-on experience in secure API integration , authentication flows , and frontend architecture . Strong proficiency in native mobile development using Swift (iOS) and/or Kotlin (Android) - capable of guiding mobile-first initiatives and bridging web-mobile experiences. Skilled in writing clean, maintainable, and well-tested code , with a strong grasp of TDD/BDD … across teams. Energized by fast-paced, regulated environments where speed, compliance, and innovation go hand-in-hand. Your Technical Toolkit React/React Native/TypeScript Swift (iOS)/Kotlin (Android) JavaScript/HTML/CSS RDBMS (Oracle, Sybase)/NoSQL (Document DB) AWS/Docker/Kubernetes CI/CD pipelines : GitHub Actions, CircleCI, Bitrise Testing frameworks : Jest More ❯

Android & iOS Engineer Roles | Kotlin/Swift | London Hybrid | Consumer App | Tech for Good 💚 Are you passionate about building high-quality mobile apps that make a genuine impact on the lives of others? 📱 Do you want to work on a product used by millions of users globally every single day? 🌍 If so, this could be the opportunity for you. … to Unicorn status and are seeking several talented Mobile Engineers to join them as they embark on their next phase of growth 🦄 Live roles: ✨ x2 Mid–Senior Android Engineer (Kotlin) – building cutting-edge native features, improving app performance, and working across design, architecture, and delivery. ✨ x1 Senior iOS Engineer (Swift) – shaping the iOS app’s evolution, leading on new … ideas, energy, and curiosity, and help shape the future of a product used worldwide. What we’re looking for: Android Engineer: ✔ 2+ years building cutting-edge Android apps in Kotlin ✔ Strong grasp of Coroutines, caching, and Jetpack Compose ✔ Experience delivering apps to the Play Store ✔ Passion for clean architecture (MVVM/MVI) and great user experiences iOS Engineer: ✔ 5+ More ❯

Senior Kotlin Developer - Front office/Kubernetes - sought by investment bank based in London - Hybrid - Contract *Inside IR35* Key Responsibilities Develop and maintain backend components of a next-gen trading platform. Work with Java and/or Kotlin to deliver robust solutions. Deploy containerised applications using Kubernetes and Docker. Leverage MongoDB and Databricks for data processing and analytics. More ❯

Responsibilities Include: Platform Ownership: Drive the architecture and development of the core React Native application, ensuring it is scalable and high-performance. Native Integration: Deep-dive into native components (Kotlin/Swift, with a focus on iOS) to build custom features and optimise performance where required. Production Lifecycle: Own the entire mobile deployment lifecycle, including managing App Store/… is being looked for: Deep experience in React Native , with a proven track record of building and deploying complex, production-ready applications. Experience working with native modules in either Kotlin (Android) or Swift (iOS) , with a preference for iOS expertise. Demonstrated experience owning the application release process on the App Store or Google Play Store. Familiarity with tools and More ❯

Benefits package Career progression and skill up opportunities Plus more What do I need? Ability to write clean reusable code for mobile development in languages like Java or JavaScript, Kotlin etc Experience working on applications for deployment on Google Play/Android Store Fronts Have an interest or some knowledge of Kotlin Experience testing and releasing new applications More ❯

will be surrounded by an extremely strong engineer team and have plenty of opportunities to learn from seniors. What You’ll Be Doing Developing and shipping new features in Kotlin, using Jetpack Compose to deliver world-class mobile experiences. Collaborating with designers, iOS engineers, and backend teams to craft beautiful, responsive UIs. Contributing to a clean, scalable architecture (MVVM …/Hilt). Owning performance, accessibility, and overall app experience across a variety of devices. Requirements for the role 3+ years of commercial Android development experience. Strong proficiency in Kotlin , Jetpack Compose , and modern Android frameworks. Deep understanding of lifecycle management , asynchronous programming , and UI state handling . Familiarity with clean architecture principles and unit/UI testing . More ❯

Java/Kotlin Engineer A fast-growing Fintech company based in London, are on the lookout for talented Kotlin Engineers to join their high-impact engineering team. You don’t need to be a Kotlin expert yet — if you’ve worked in any JVM language (Java, Scala, Clojure, etc.) and are keen to learn Kotlin, we … d love to hear from you. What you’ll do Design and build high-performance backend services using Kotlin (and the wider JVM ecosystem). Collaborate closely with product managers, data engineers, and designers to deliver customer-focused financial solutions. Write clean, testable, and maintainable code with a focus on reliability and scalability. Contribute to architectural discussions and help … shape our platform as we scale. What we’re looking for Strong experience with Java, Scala, Kotlin, or another JVM language. Solid understanding of modern software engineering principles — from CI/CD to cloud-native development (AWS, GCP, or Azure). Experience with frameworks like Spring Boot, Micronaut, or Ktor is a plus. A mindset geared toward collaboration, curiosity More ❯