1,381 Backend jobs in the United Kingdom

Siamo alla ricerca di un Backend Developer esperto, con una solida esperienza nello sviluppo di API e sistemi distribuiti, da inserire in un progetto innovativo nel settore dei servizi finanziari digitali.

Progettare, sviluppare e mantenere API RESTful in TypeScript e C#

Gestire e ottimizzare database SQL (MS SQL) e NoSQL (Firebase, CosmosDB)

Integrare modelli di AI e Machine Learning per potenziare le funzionalità delle applicazioni

Collaborare con il team frontend per garantire un’integrazione fluida tra i sistemi

Implementare strategie di scalabilità , sicurezza e performance per le applicazioni backend

Scrivere codice pulito, documentato e testato seguendo le best practice di sviluppo

Almeno 5 anni di esperienza nello sviluppo backend

Ottima conoscenza di TypeScript/Node.js , C# e MS SQL

Esperienza con framework backend e servizi cloud (Azure o Google Cloud)

Familiarità con ambienti FaaS/PaaS e con pipeline CI/CD

Buone capacità di comunicazione e inglese professionale

Conoscenza del settore finanziario (trading online, banking o criptovalute come plus)

Esperienza con microservizi e architetture serverless

Conoscenza di strumenti di monitoraggio e logging

Esperienza con strumenti di testing automatizzato

Progetti tecnologicamente stimolanti in un contesto finanziario in crescita

Collaborazione con team altamente qualificati

Ambiente di lavoro flessibile e orientato all’innovazione

Opportunità di crescita e formazione continua  

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Backend Software Engineer | Bristol | 70 - 80,000 (doe)

Are you a talented and motivated Backend Software Engineer looking for an exciting opportunity to work on mission-critical financial systems?

As a Backend Software Engineer, you will play a crucial role in building and maintaining the software systems that support our middle and back-office operations. You will be responsible for ensuring the accuracy of financial data, facilitating risk monitoring, and streamlining compliance and trade reconciliation processes. This role is ideal for someone who enjoys working on core operational infrastructure.

Experience required:

• Proficiency in Python for backend development and data processing.
• Strong understanding of SQL, relational databases, and query optimization.
• Experience working with cloud platforms (AWS).
• Familiarity with Git and CI/CD workflows (GitHub Actions preferred).
• Experience of working in the energy sector is desirable.

Please note that is role is 5 days per week in their central Bristol office - this is non-negotiable, so if you cannot commit to 5 days in the office, this company won't be right for you. However, this is a brilliant time to join the business - they're growing out a new team to focus on the European markets and you will receive unparalleled exposure!

Benefits include private healthcare, 30days holidays plus bank holidays, frequent company socials (Skiing Trips), learning and development opportunities and more!

If you are looking for a challenging and rewarding opportunity to utilize your skills in a dynamic and innovative environment, then we invite you to apply for the position of Backend Software Engineer. Join our team and make a significant impact in the world of financial operations!

We’re seeking a versatile Backend / AI Developer with hands-on experience delivering end-to-end solutions from concept to production. The ideal candidate brings strong expertise in Java (Spring Boot) and Python, with the ability to build scalable microservices, SaaS platforms, and AI-powered applications. You should be proficient in cloud platforms such as AWS and GCP, and experienced in API-first design, security best practices, and observability tools to ensure reliable, high-performing systems.

On the AI side, you have practical experience working with large language models (LLMs), prompt engineering, and frameworks like LangChain, with knowledge of advanced patterns such as Retrieval-Augmented Generation (RAG) and agent-based systems. A strong foundation in Agile SDLC practices is essential, along with familiarity in containerization, DevOps, and low-code/no-code platforms.

Experience across both backend and AI domains will enable you to seamlessly integrate advanced AI capabilities into scalable enterprise systems, making you a key contributor to building the next generation of intelligent, secure, and high-performance applications.

Backend / AI Developer – Key Skills & Competencies

Core Development:
Hands-on experience in taking solutions from concept to production, with strong expertise in Java (Spring Boot) and Python for backend and AI-driven application development.

Proficiency in building microservices, SaaS solutions, and API-first architectures to enable scalable, interoperable systems.

Frameworks & Tools:
Backend: Spring Boot (web, data, cloud, security), JUnit 5, Mockito, database integration.

AI: LangChain, Retrieval-Augmented Generation (RAG), MCP servers (as consumer and developer), and prompt engineering for LLM optimization.

Exposure to popular libraries and frameworks (Apache Commons, Guava, Swagger, TestContainers).

Architecture & Platforms:
Skilled in designing and deploying distributed systems on cloud hyperscalers (AWS, GCP).

Familiarity with containerization (Docker), CI/CD pipelines, DevOps practices, and Infrastructure as Code (IaC).

Experience with workflow/orchestration engines and agent-based architectures.

Scalability, Data & Observability:
Expertise in designing for scalability, performance, and extensibility across structured, semi-structured, and unstructured data.

Strong foundation in security best practices, with practical knowledge of logging, metrics, tracing, distributed debugging, and performance monitoring.

Awareness of AI application security and model safety considerations.

AI Development: 
End-to-end development of AI-powered solutions, from concept to production readiness.

Practical experience with LLMs and agentic AI, including LangChain integration, RAG pipelines, prompt engineering, and model consumption via APIs.

Ability to bridge backend and AI workflows, integrating advanced AI capabilities into scalable enterprise platforms.

SDLC & Agile Practices: 
Familiar with the Software Development Life Cycle (SDLC) and effective collaboration in Agile environments.

Ability to leverage low-code/no-code platforms for rapid solution delivery.

Nice to Have:
Knowledge of Domain-Driven Design (DDD) and schema-first development.

Experience designing plugin architectures and extensibility frameworks.

Exposure to frontend development (HTML5, CSS3, TypeScript, responsive UIs) for full-stack collaboration.

To apply, please submit your CV and daily rate expectation by clicking on the relevant links. If successful you will be contacted by one of our consultants within 3 working days. Unfortunately, due to the volume of applications we expect to receive for this role, if you do not hear from us within this time you should presume your application has been unsuccessful on this occasion.

Grassroots Recruitment is acting as a recruitment agency and a recruitment business in respect of this contract vacancy. Grassroots Recruitment is an equal opportunities employer and recruiter. We welcome applications from all sections of the community, regardless of age, race, sex, sexual orientation, marital status, religion or disability

The Opportunity

We're looking for a talented Senior Backend Developer to join a purpose-driven tech team that creates solutions making a real difference in people's lives. This is more than just a job, it's a chance to shape systems that support individuals and organisations across the UK and Ireland.

The Role

As a Senior Backend Developer, you'll be a founding member of a newly formed cross-functional engineering team. You'll play a key role in setting the tone for the team's culture, practices, and success. Your technical expertise will shape our architecture and support business-critical applications.

This is a highly collaborative role suited to someone with a passion for software craftsmanship and continuous improvement.

Key Responsibilities

• Enhance features and functionality of core products
• Design and implement scalable backend systems using C# (.NET 5+ preferred)
• Write clean, maintainable, and testable code using TDD/BDD principles
• Create and maintain RESTful and GraphQL APIs
• Collaborate with POs, BAs, and stakeholders to define solutions
• Mentor junior developers and promote best practices
• Drive improvements in development processes and tools

What You Bring

• 5+ years of backend development experience
• Expertise in C#, .NET (preferably .NET 6+), and SQL Server
• Deep understanding of SOLID and OOP principles
• Skilled in Git, Unit Testing (NUnit), and API development
• Familiarity with CI/CD pipelines and agile methodologies
• Strong communication and problem-solving skills
• Desire to grow within a dynamic and evolving team

Why Join?

This is an incredible opportunity to make your mark in a company that prioritises purpose, innovation, and professional growth. You'll be part of a team where your ideas are welcomed, your development is encouraged, and your work truly matters.

Ready to build something that helps others-and builds your career in the process? Apply today.

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INDMANS

• Design, develop, and maintain high-performance backend services and APIs.
• Implement and manage database solutions, ensuring data integrity and efficient querying.
• Write clean, well-documented, and testable code following best practices.
• Collaborate with frontend developers to integrate user-facing elements with server-side logic.
• Optimize applications for maximum speed, scalability, and security.
• Participate in code reviews to ensure code quality and share knowledge with the team.
• Troubleshoot and resolve bugs and performance issues.
• Contribute to architectural decisions and technology stack selection.
• Stay up-to-date with emerging backend technologies and industry trends.
• Work closely with product managers and designers to translate requirements into technical solutions.
• Mentor junior developers and contribute to a positive team culture.
• Implement and maintain CI/CD pipelines for automated testing and deployment.

• BSc or MSc in Computer Science, Software Engineering, or a related field.
• 5+ years of professional experience in backend development.
• Proficiency in at least one modern backend programming language (e.g., Python, Java, Node.js, Go, C#).
• Strong experience with relational databases (e.g., PostgreSQL, MySQL) and/or NoSQL databases (e.g., MongoDB, Cassandra).
• Experience with RESTful API design and development.
• Familiarity with cloud platforms (e.g., AWS, Azure, GCP) and containerization technologies (e.g., Docker, Kubernetes).
• Solid understanding of software design patterns and principles.
• Experience with testing frameworks and methodologies.
• Excellent problem-solving and debugging skills.
• Strong communication and collaboration skills, comfortable working in a remote team.
• Experience with Agile development methodologies.

• Design, develop, and maintain scalable, high-performance backend services and APIs.
• Write clean, efficient, well-documented, and testable code using (mention specific languages/frameworks, e.g., Python/Django, Node.js/Express, Java/Spring Boot).
• Collaborate with frontend developers to integrate user-facing elements with server-side logic.
• Optimise applications for maximum speed, scalability, and reliability.
• Implement robust security measures and data protection protocols.
• Manage and optimise database performance, including schema design and query tuning.
• Participate actively in code reviews, providing constructive feedback and ensuring code quality.
• Troubleshoot and resolve complex technical issues in production environments.
• Contribute to architectural design decisions and technical strategy.
• Mentor junior backend developers and foster best practices within the team.
• Stay up-to-date with emerging backend technologies and industry trends.
• Work within an Agile/Scrum development process.
• Deploy and manage applications using CI/CD pipelines and cloud infrastructure (e.g., AWS, Azure, GCP).

• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience.
• Minimum of 5 years of professional experience in backend development.
• Proficiency in (mention specific languages/frameworks, e.g., Python/Django, Node.js/Express, Go, Ruby on Rails, Java/Spring Boot).
• Strong understanding of RESTful API design principles and best practices.
• Experience with relational databases (e.g., PostgreSQL, MySQL) and/or NoSQL databases (e.g., MongoDB, Redis).
• Knowledge of cloud platforms (AWS, Azure, GCP) and containerisation technologies (Docker, Kubernetes).
• Familiarity with microservices architecture.
• Experience with version control systems (e.g., Git).
• Excellent problem-solving, analytical, and debugging skills.
• Strong communication and collaboration skills, with experience working in distributed teams.
• Ability to work independently and manage time effectively in a remote setting.

Lead Backend Developer

Location: London - 1x a month

Salary: Up to £120,000 (D.O.E) + benefits

Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who.

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Senior Backend Developer at Mighty Fine Apps.

• Hours: Full-Time
• Product : Live Transcribe
• Location: London & Remote

Mighty Fine Apps is a fast-growing company dedicated to creating innovative apps that empower the deaf and hard of hearing communities. Our flagship product, Live Transcribe , provides real-time transcription services that transform lives. Right now, we’re scaling up a new backend system to improve our performance and reliability, and bring many frequently requested features to life.

We’re looking for an experienced backend developer to join us in crafting the infrastructure that powers Live Transcribe. Your focus will be designing, building, and maintaining scalable backend systems comprising library packages and API codebases written in Typescript and running on Node.js. While strong backend skills are the requirement, any experience in iOS or front-end web development would be a big bonus. Your first tasks will center around expanding the functionality one of our internal libraries.

• Backend System Development: Design, build, and maintain scalable, high-performance backend systems and RESTful APIs using Node.js, including high-throughput websocket endpoints.

• Project Leadership: Take ownership of key areas for a new accounts system that enables key features and enhances our users’ experience.
• Integration & Collaboration: Work closely with mobile and web developers, product teams, and other stakeholders to ensure seamless integration with client-facing applications.
• Cloud & Infrastructure Management: Oversee deployment, monitoring, and scaling of backend services on AWS.
• Quality & Best Practices: Implement robust testing, code reviews, and continuous integration practices to maintain a high standard of code quality.
• Innovation & Problem Solving: Gather requirements, troubleshoot issues, and iterate on solutions in a dynamic, agile environment.

Requirements

• Backend Expertise: 5+ years of experience in backend development with a proven track record in building scalable APIs and systems.

• Technical Proficiency: Strong Typescript and general data modelling and architecture skills. Experience with Node.js, a deep understanding of RESTful API design, and experience with websockets and stream-based systems.
• Database Knowledge: Experience with relational databases such as PostgreSQL, and strong database design principles.
• Cloud Experience: Familiarity with cloud-based deployment, monitoring, and scaling solutions such as AWS.
• Remote Collaboration: Excellent communication skills and the ability to work effectively in a largely remote, international team.
• Bonus Skills:
• iOS development experience (Swift, SwiftUI) is a major plus.
• Front-end web development experience (HTML, CSS) is also beneficial.

Benefits

• Hybrid Hours: 1 day in-office, 4 days remote. Collaborate with a diverse and friendly international team.

• Impactful Work: Contribute to a product that makes a real difference in people’s lives.
• Innovative Environment: Become part of a greenfield project that will shape the future of Live Transcribe.
• Professional Growth: Enjoy continuous learning opportunities, mentorship, and career advancement.
• Collaborative Culture: Join a respectful and supportive team that values innovation, transparency, and creativity.