Java Kotlin Lead

Java/Kotlin Team Lead - London - 6 months - Circa £650pd - 3 days pw

We are partnered with a tech client who are looking for aLead Backend Engineerwith strong experience inJava and/or Kotlinto take a key technical leadership role within a backend-focused engineering team

Technical Leadership & Influence

• Lead design discussions, technical deep dives, and knowledge-sharing initiatives
• Anticipate technical risks and proactively propose scalable, secure solutions
• Influence product and platform decisions through strong technical insight

Hands-on Software Development

• Develop high-quality backend services usingJava (17+)and frameworks such asSpring Boot or Micronaut
• Build resilient, high-throughput services supporting secure transaction processing
• Design and implement integrations with external systems including payment gateways, banks, and fraud platforms

Core Skillset

• Proven experience as aLead Java Engineerin backend-heavy, multi-level engineering teams
• Strong expertise inJava 17+, withSpring Boot or Micronaut;Kotlinexperience is a bonus (or willingness to learn)
• Hands-on experience withevent-driven architectures,Kafka, microservices, and enterprise integration patterns
• Solid understanding ofpayment systemsand PSP integrations, including fraud, tokenisation, and settlement flows
• Experience withcloud infrastructure(Azure preferred),Kubernetes, and CI/CD pipelines
• Working knowledge of relevant regulatory standards such asPCI DSS, SCA, and PSD2s
• Experience working inAgile/Scrumenvironments with a DevOps and test-driven mindset

Nice to have

• Experience withIAM platformssuch as Okta, Auth0, Keycloak, or ForgeRock
• Knowledge of identity and security standards includingOpenID Connect, OAuth2, JWT, SAML, and MFA
• Broader cloud exposure acrossAzure, AWS, or GCP

If this is of interest, please send an updated CV and we can set up a call?

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