Citi★3.9 (21k)· London

Build index‑calculation platform components at Citi using Scala and Python, integrating via REST APIs and Solace message queues, and working with Couchbase (NoSQL), Gradle, Jenkins, Tekton, and OpenShift. The SolstiCE team supports the Citi Investment Strategies (CIS) engineering group by developing and maintaining an index calculation platform for the Equity Derivatives Tech business.

You will work with Java and SpringBoot microservices on Linux and OpenShift, building APIs and using build tools like Gradle, CI/CD, Git, and BitBucket/GitHub. As part of the Technology Application Strategy team, you will design and deploy cutting-edge developer tooling and productivity solutions for Citi’s global developer community.

Palantir★3.9 (37)· London

You'll use Java, Go, and TypeScript alongside open-source tools like Cassandra, Spark, Elasticsearch, React, and Redux with Gradle and GitHub. You'll contribute to Palantir Gotham, Apollo, or Foundry—data platforms deployed across critical institutions.

Palantir★3.9 (37)· London

As an intern at Palantir, you will write high-quality code for Palantir Gotham, Foundry, or Apollo using Java, Go, and TypeScript, along with open-source tools like Cassandra, Spark, Elasticsearch, React, and Redux. You will join a small product-development team building features for users in public and private sectors, such as research scientists and intelligence analysts.

You will work with Java, JavaScript, Groovy, SQL, AWS, Terraform, Kubernetes, and Docker to build and support API platforms. The API Management Platform team manages gateways, authentication, authorization, throttling, and quota for Elsevier's APIs, providing analytical dashboards and a developer portal.

You will work hands-on with Java, Kafka, Kubernetes/OpenShift, caching solutions, REST APIs, Spring Boot, SQL, Git, and Gradle/Maven within a high-volume message processing environment for a trading client in the financial services domain.

Use Core Java, Spring, Linux, relational databases, and multi-threading to build and maintain front office eTrading applications for Fixed Income and Derivatives flows. You will work directly with traders, sales, and quants in a globally distributed team, optimizing performance and supporting low-latency solutions.

Java, Spring Boot, React/Angular/Vue.js, PostgreSQL/MySQL, REST APIs, AWS/Azure/GCP, Docker/Kubernetes, Git, Maven/Gradle, and CI/CD. You will design, code, test, and maintain scalable Java applications for mission-critical systems as part of an agile squad.

Core Java, Spring Framework, Linux, and relational databases for low-latency eTrading applications on a globally distributed team building the next generation Front Office Trading System for Fixed Income and Derivatives flows.

You'll work with Java, Spring, AWS Kinesis/SQS/SNS, MongoDB, Redis, PostgreSQL, GraphQL, OpenTelemetry, Datadog, and AI tools (Claude Code, Claude MPM, in-house MCP server). The Dev Platform team owns the architecture and evolution of Duetto's core Java/Spring monolith, which processes millions of hotel rate decisions daily, driving domain decomposition and platform modernisation.

Java, Spring Boot, DevOps, and Linux are used to design and develop front office eTrading applications for the trading business, working directly with traders, sales, and quants. The role is part of a globally distributed team.

Wise★3.5 (42)· London

Android Engineer uses Kotlin, Compose, Gradle, GitHub Actions, and REST APIs. The Regional Experience team delivers localized user experiences for onboarding, verification, sending, and spending on Wise's global money platform. The role collaborates with 60+ mobile engineers to set best practices.

BNY★3.5 (5.5k)· London

Lead a Build Engineering team building BNY’s central build automation platform, optimizing CI/CD pipelines and developer workflows. Use Java, Go, JavaScript, Python; GitHub Actions, GitLab CI/CD, Jenkins, Bazel, Gradle, Maven; Artifactory, Nexus; and AI/ML-driven build tooling.

Work with Python, SQL, and ML stacks (PyTorch, TRL) to build evaluation and data pipelines for LLMs and AI coding agents. The team owns how AI agents generate, analyze, and improve Kotlin code across Android, KMP, and server platforms, creating benchmarks and post-training pipelines.

Rightmove★3.7 (31)· London

Java, Spring Boot, Elasticsearch, Kafka, Gradle, Hibernate, Couchbase, SQL, and Docker. You will build and improve microservices that power Rightmove’s iOS and Android apps, working in a cross-functional team.

Marshmallow★2.3 (3)· London

You'll work with Kotlin, Jetpack Compose, Kotlin Coroutines, MVVM/MVI, Bitrise CI/CD, and AI tooling. The New Financial Products Team is transforming Marshmallow into a high-engagement financial companion for migrants in the UK, building Android features end-to-end.

Version 1★3.9 (39)· London

You will work with Java, Kafka, Kubernetes/OpenShift, caching solutions, REST APIs, Spring Boot, SQL, Redis, Gradle/Maven, Git/Bitbucket, and AI coding assistants. You will join a UK Digital Data & Cloud Practice team supporting a high-volume message processing environment for a global financial services client.

Senior Backend Java Engineer role building scalable, secure backend systems with modern Java, Spring Boot, Spring Data JPA/Hibernate, Spring Security, REST APIs, microservices, SQL/NoSQL databases, Kafka/RabbitMQ, Docker, AWS/Azure/GCP, CI/CD tools, Maven/Gradle, and observability tooling. The role works on client-facing projects for an AI-native consulting partner.

Lead Backend Java Engineer role using modern Java, Spring Boot ecosystem (Security, Data JPA, Cloud), REST APIs, microservices, Docker, Kubernetes, and cloud platforms (AWS, Azure, GCP). CreateFuture is an AI-native consulting partner building digital products for clients like PayPal and adidas, with the lead defining technical strategy, architecture, and standards across multiple client engagements and engineering teams.

Work with Ruby, Rails, JavaScript, Python, AWS (EC2, S3, Route53), Docker, Kubernetes, OpenTelemetry, Grafana, Kibana, Jenkins, Ansible, Terraform, and CI/CD tools. You will own and improve the CI/CD stack and development tools to boost code development and build processes for the engineering team at Sensor Tower, a digital intelligence platform.

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.

Elsevier★3.8 (769)· London

You'll build and maintain API platforms using Java, JavaScript, Groovy, JSP, HTML, XML, SQL, and bash, with Maven/Gradle, PostgreSQL, AWS services via Terraform, Docker/Kubernetes, and observability tools like New Relic and Kibana. The team supports Elsevier's healthcare education products, including electronic health records systems for clinical training. You'll design scalable solutions, implement best practices, and improve developer experience for internal and external users.

You'll build Android mobile experiences for xAI's AI applications using Kotlin, Jetpack Compose, and reactive programming. You'll work on a small team creating cutting-edge AI products that deliver user impact, with opportunities to use Rust for backend integration. Strong product sense, ownership, and architectural expertise in large production apps are essential.

Neo4j★3.0 (8)· London

You'll work on Neo4j Graph Analytics for Snowflake, a Snowflake Native App using Java, Python, SQL, Docker, and Snowpark Container Services to deliver graph analytics (PageRank, community detection, pathfinding, embeddings) directly into customer data warehouses. The role involves designing SQL APIs, owning build and release pipelines, improving security, and collaborating with enterprise customers across financial services, supply chain, and telco sectors.

TP ICAP★3.1 (34)· London

You'll work with Java, FIX connectivity, distributed messaging (Solace/Kafka), Maven/Gradle, and cloud platforms (AWS, Kubernetes) to design and optimize low-latency, fault-tolerant trading system components. TP ICAP is a global financial market infrastructure provider and the world's largest interdealer broker, serving electronic trading across multiple asset classes. This is a senior role mentoring engineers on a distributed team.