5 senior backend developer jobs found in London, Greater London

Senior Backend Developer (Java/Spring Boot/AWS) Rate: £500 - £600 Outside IR35 Location: London - 3 times on site a month Duration: 6 months initial The role: I'm working with a financial services organisation that needs a Senior Backend Developer to build and maintain cloud-based services on AWS. The work is hands-on and includes code reviews and input into technical decisions. Responsibilities: Build REST and event-driven microservices in Java and Spring Boot Deploy and support services on AWS (eg ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design Reasonable Adjustments: Respect and equality are core values to us. We are...

Senior Backend Developer (Java / Spring Boot / AWS) Rate: £500 - £600 Outside IR35 Location: London - 3 times on site a month Duration: 6 months initial The role: I 'm working with a financial services organisation that needs a Senior Backend Developer to build and maintain cloud-based services on AWS. The work is hands-on and includes code reviews and input into technical decisions. Responsibilities: Build REST and event-driven microservices in Java and Spring Boot Deploy and support services on AWS (e.g. ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design...

🤖 Senior Android Engineer – Fintech - 6m OUTSIDE contract 💷 Up to £500/day | Outside IR35 📆 6-Month Contract 📍 Central London – 3 days onsite We’re working with a leading fintech scale-up looking for an experienced Senior Android Engineer to join their mobile engineering team on an initial 6-month contract. 📱 This is a highly product-focused role, working on a major Android product build and creating polished, data-rich mobile experiences. You’ll have genuine end-to-end ownership , from initial idea and technical approach through to testing and release. 👨 💻 A senior doer This is an important one: they need someone senior who is still very close to the code. They’re not looking for a hands-off Lead, they want a highly technical, hands-on Senior Android Engineer who can make good architectural decisions but still enjoys getting stuck into the implementation. You’ll also need to be a confident, clear communicator who can articulate your...

Integration Software Engineer/(IPaaS - Boomi - AWS) - UK CNI - OUTSIDE IR35 - ACTIVE SC CLEARANCE NEEDED Tecknuovo is a deliberately different digital consultancy, delivering secure, modern technology solutions while upskilling client teams to ensure zero long-term dependency. We are seeking an experienced Integration Engineer, Software Engineer, Backend Engineer or Java Developer to support a high-profile integration Proof of Concept within a large-scale UK government organisation responsible for delivering critical national services. This role would suit engineers with a strong background in API development, Back End engineering, system integration or Middleware technologies , who enjoy solving complex technical challenges and building scalable solutions in cloud-based environments. You do not need to come from a pure Boomi background. Whilst experience with Boomi is highly desirable, we are equally interested in engineers who have delivered...

Contract Python Engineers – 3–6 Month Contracts London / Hybrid | £650–£750 pd Outside IR35 I’m working with a heavily VC-backed financial services platform that is going through a really exciting period of global expansion. They’ve built their own technology offering using modern Python and are disrupting a traditionally legacy-heavy sector. They’re now looking to bring in three technically strong Python Engineers on an initial 3–6 month contract, with the potential for further work. This is a small, highly technical team, so they’re looking for engineers who can genuinely stand on their own two feet. You’ll be expected to work across the development lifecycle rather than relying on someone else to handle areas such as testing, architecture or data structures. They’d particularly like to speak with people who have worked in smaller engineering teams, start-ups or scale-ups, where you’ve had to take ownership rather than being one small part of a huge...