You’ll design and build high-performance software using Rust, C/C++, React, REST APIs, SQL, Redis, and NGINX. The team is rebuilding legacy institutional investment management systems into a cloud-native platform covering portfolio management, trading, risk analytics, and AI. This is an early-stage, small collaborative team.

This role develops generative AI applications using Java, Python, React or Angular, LangChain, LlamaIndex, Hugging Face, Docker, Kubernetes, and AWS, with tools like GitHub Copilot. You will build scalable, AI-powered solutions for Citi’s global finance operations.

This Staff Solutions Engineer role involves using Docker, Kubernetes, NGINX, HTTP, AWS, Postgres, Cassandra, and Linux to support Kong’s API Management & Connectivity solutions. The engineer leads the technical sale cycle with Enterprise & Strategic accounts, handling demos, proof-of-concepts, and customer onboarding.

You will work with Docker, Kubernetes, NGINX, HTTP, AWS, Postgres, Cassandra, Linux, DevOps/CI/CD pipelines, and API Gateway or Service Mesh. As a Solutions Engineer, you support field sales by leading technical sale cycles for Kong’s API Management & Connectivity solutions. The company builds Kong Konnect, a unified API and AI platform for securing and managing APIs and AI models.

Apple★4.1 (14k)· London

Work with Kubernetes (GKE/EKS), GCP/AWS, Java, Swift, Python, or TypeScript, Nginx, Envoy, Prometheus, Docker, Terraform, Pulumi, and CI/CD pipelines. The SRE team supports Private Cloud Compute (PCC), Apple's privacy-preserving cloud intelligence platform, ensuring availability and automation of critical systems.

Community Fibre Limited★3.3 (55)· London

You will work with AWS, Linux (Ubuntu, Debian, CentOS, RHEL), Python, Bash, Perl, Terraform, Puppet, Ansible, CI/CD pipelines, FreeRADIUS, Palo Alto Networks, FreeIPA, iptables, and OpenSearch/Elastic Stack. Community Fibre builds and operates London’s fastest 100% full-fibre broadband network. You will maintain both cloud and on-premises infrastructure, mentor other engineers, and act as a senior escalation point.

Citi★3.9 (21k)· London

Build and scale AI-powered financial systems using Java, Spring, React/Angular, Python, FastAPI, Docker, and GitHub Copilot within Citi’s global tech environment. You will design generative AI agents, LLM workflows, and RAG pipelines while working on enterprise microservices, mobile, or front-end development. This role is for an individual contributor on an agile team.

Visa★3.9 (1.2k)· London

Work with Kong API gateway (Lua plugins), Java/Spring Boot, Datadog, Kubernetes, and GenAI tools on Visa’s Edge team, which owns the API Gateway and authentication layer—the critical path for all external API calls. This is a small, high-leverage team designing and operating systems to keep the platform available, secure, and easy for partners to integrate with.

You will work with Amazon Web Services, Nginx, MySQL, Redis, and ElasticSearch. As a member of the Systems Engineering team, you will design and deliver mission-critical services and systems for the high-traffic Freelancer.com marketplace and other business products.

Funding Circle★3.5 (53)· London

You will work with React Native, React.js, TypeScript, Firebase, Gradle, XCode, REST APIs, and CI/CD for app releases on iOS and Android. The role involves building and scaling a mobile app for Funding Circle’s fintech platform that uses data to provide fast funding to small businesses.

Zuora★3.6 (33)· London

You'll develop and scale Zephr, Zuora's AI-powered subscription experience platform for digital publishers, using Java (JDK 21+), Kotlin, JavaScript/TypeScript, React, and a microservices stack including Vert.x, Spring, Kafka, MySQL, and AWS/Kubernetes. You'll lead design and implementation of high-throughput APIs and backend solutions, mentor junior engineers, and contribute to technical standards for this multi-tenant, webscale application serving media companies' subscription management.

You will work as a full stack engineer with primary focus on C#, .NET Core, and AWS cloud-native back-end services, including REST API design, Docker containerization, and infrastructure as code, while also contributing front-end features using React, TypeScript, and Node.js. You'll join an autonomous product team within StepStone Group's Profile domain, owning end-to-end technical design and implementation, with responsibilities spanning microservices architecture, CI/CD tooling like Bamboo and Octopus, automated testing, and mentoring other engineers on modern .NET and cloud practices.

Depop★4.4 (61)· London

You'll architect and lead the technical vision for Depop's iOS application, working with Swift, UIKit, SwiftUI, MVVM/VIPER architecture, XCTest/XCUITest, Swift Package Manager, and CI/CD tools like TestFlight and feature flags. You'll mentor engineers, guide cross-functional teams on iOS strategy, and drive modernization initiatives for the peer-to-peer circular fashion marketplace serving 56 million users. This staff-level role involves shaping long-term platform direction and fostering engineering excellence across the iOS Platform team.

You'll work with Swift, Xcode, Interface Builder, and Auto Layout to build features for ASOS's iOS app serving over 8 million active users across iPhone and iPad. The Customer Experience team focuses on delivering high-quality, accessible interfaces at scale through collaborative, agile development while maintaining code quality and reliability.

You'll develop iOS features using Swift, Xcode, Interface Builder, and Auto Layout for ASOS's fashion e-commerce app, which serves over 8 million active users globally. Working within the Customer Experience team, you'll collaborate cross-functionally to deliver high-quality, accessible user experiences while maintaining code quality, reliability, and adherence to Apple's design guidelines.

Apple★4.1 (14k)· London

You'll work with Swift and C++ to build ML-inference applications and services on Apple Silicon, focusing on generative AI within Apple Intelligence's Private Cloud Compute. The team engineers frameworks to distribute and coordinate ML inference tasks across hardware acceleration blocks, integrating inference code into production service stacks while ensuring reliability and performance. You'll collaborate across Apple to implement new functionality from research, improve system stability, and maintain code quality in large-scale cloud systems.

Apple★4.1 (14k)· London

You'll work with Ruby, Rails, PostgreSQL, Cassandra, Docker, and Kubernetes to build backend systems for Apple's developer documentation platform on the developer website and Xcode. The documentation engineering team creates developer tools and framework support, scaling existing technology while innovating new products and infrastructure. You'll collaborate with a small, impactful backend team across Apple departments, mentor engineers, and contribute to architecture and code reviews.

Apple★4.1 (14k)· London

You'll work with large language models, MLOps/LLMOps frameworks, and programming languages like Python and Swift to build and integrate ML models into Apple's developer tools. The Developer Publications Intelligence team combines machine learning and software engineers focused on LLM evaluation at scale and on-device model deployment for third-party developer platforms.

Apple★4.1 (14k)· London

You'll work with Java, Python, or Go alongside Kubernetes, Docker, Nginx, Envoy, Prometheus, Grafana, and Splunk to build and maintain highly available systems powering iCloud Photos, Mail, Drive, Backup and other services at massive scale across multiple geographies. Apple Services Engineering operates infrastructure serving hundreds of millions of users globally, requiring expertise in distributed systems, observability, disaster recovery, capacity planning, and Linux fundamentals.

JPMorgan★3.9 (20k)· London

You'll develop features for the native iOS Nutmeg app using Swift, Xcode, MVVM + Coordinator architecture, UIKit/SwiftUI, XCTest, and Bitrise CI/CD. J.P. Morgan Personal Investing provides digital wealth management services to 275,000+ UK investors, and you'll own tasks from estimation through release while participating in code reviews and technical initiatives within an Agile squad structure.

You'll develop iOS features for Freetrade's investment platform using Swift, SwiftUI, and UIKit, with a tech stack including MVVM-C architecture, RxSwift, Factory dependency injection, and Apollo GraphQL. The iOS team builds user-facing features for customers investing across UK, US, and EU markets while collaborating with backend, design, product, and QA teams to ship new functionality like mutual funds and AI-driven experiences. Expect 3-5 years of iOS production experience, strong knowledge of Swift, SwiftUI, reactive programming, and mobile architecture patterns.

You'll develop the Freetrade iOS app using Swift, SwiftUI, MVVM-C architecture, RxSwift, Factory dependency injection, and Apollo GraphQL API, building investment features like mutual funds and bonds. Freetrade is reshaping retail investing across UK, US, and EU markets. You'll collaborate across mobile, backend, design, and product teams while contributing to architecture, code quality, and customer support.

Canva★4.3 (32)· London

You'll build high-performance UIs in C++ and Objective-C for the Affinity product suite, optimizing code for responsiveness and memory while working on native macOS and iOS interfaces supporting mouse, touch, and stylus input. The Affinity team at Canva creates photo editing, vector design, and layout applications for creatives. You'll contribute to architectural decisions across shared libraries and collaborate with design and QA teams.