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Lead Kotlin Backend Engineer — Hybrid & Flexible
Lead backend development in Kotlin/Java/JVM, building cloud-native microservices and CI/CD pipelines while mentoring engineers and collaborating across teams.
Staff Backend Engineer
Build and shape a greenfield event-based customer communications platform in Java/Spring Boot on Azure with Terraform, owning DevOps and scalable architecture while exploring Agentic AI in the SDLC.
Backend Engineer, Platform
Build and evolve Depop’s core backend services and platform infrastructure, using Scala/Python and Kubernetes to keep the marketplace’s systems scalable, reliable, and secure for millions of users.
Backend Engineer
Build core financial infrastructure for global commerce: payment flows, multi-currency ledgers, real-time tax engines, and AI-powered compliance tools in a JVM/Kotlin stack.
Senior Backend Engineer
Build and maintain the backend of a SaaS API-mocking platform in Java/Kotlin, deploy and scale cloud infrastructure, and embed AI workflows while contributing to open-source projects.
Freelance Software Developer (Kotlin) - AI Trainer
Freelance role training AI models by writing Kotlin code examples and technical content to improve GenAI’s coding and reasoning skills.
Backend Developer - Bazel
Build and maintain Bazel-based monorepo infrastructure to scale developer productivity for large codebases, using Java, Python, Starlark, and TypeScript.
Senior Java Software Engineer
Lead the architecture and technical direction of a SaaS platform connecting people to education and career opportunities using Java, Spring Boot, and cloud-native tools.
Kotlin/JVM Software Engineer
Build and maintain insurance platforms using Kotlin/JVM backends, React frontends, and APIs, collaborating on end-to-end delivery and system design.
Senior Software Engineer (JVM, Kotlin)
Builds scalable backend services in Kotlin/JVM for a large marketing platform, integrating data pipelines and APIs to power machine-learning-driven insights for enterprise clients.
Senior Principal Software Engineer (Java)
Lead architecture and delivery of enterprise-scale API gateways and edge routing for Anaplan’s cloud platform using Java/Kotlin, Kubernetes, and GitOps workflows.
Senior JVM Software Engineer
Builds and optimizes a distributed JVM-based calculation engine for financial indices and quantitative models in a high-performance finance environment using Scala or Java.
Java Software Engineer
Design and build secure, cloud-native Java applications using Spring Boot, RESTful APIs, and Kubernetes for UK digital transformation projects.
Java Software Engineer
Build and run scalable Java backend services using Spring Boot, microservices, and Azure, with CI/CD and DevOps ownership in a hybrid UK office.
Junior Java Developer: Build Modern Digital Platforms
Build and maintain modern digital platforms using Kotlin/JVM backend and React frontend, integrating APIs and deploying via CI/CD in a collaborative environment.
JAVA DEVELOPER - LONDON - CONTRACT OUTSIDE IR35 - FINTECH
Builds and maintains Java-based front-office trading systems for investment banks and fintech clients using Spring, FIX Protocol, and event-driven cloud architectures.
Software Engineer (Data)
Builds and scales Dune’s blockchain data platform, processing petabytes of data with Kotlin/Go to ingest, decode, and optimize SQL queries for on-chain analytics.
FX Risk — Lead Java Developer | Vice President
Lead Java developer building a high-throughput FX risk valuation platform using microservices, Kafka, Apache Ignite, and Oracle/MongoDB in a global banking environment.
Backend Java Developer - Birmingham • Hybrid • £50–65k • Not London
Build core Java backend services for a data-fabric platform that enforces access rules and optimizes SQL queries across distributed systems.
Java Developer - Full Stack with React.js in London - Pontoon
Build and maintain full-stack Java applications with React.js frontends, focusing on multithreaded, distributed systems and JVM tuning.