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Developer United Kingdom Jobs (On-site work)

85 Job Offers

Actuarial Modelling Developer
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Join a UK life insurer as an Actuarial Modelling Developer. This hands-on role involves building and maintaining actuarial models and automation workflows end-to-end. Ideal for a part-qualified actuary with experience in RAFM, Mantle, or Unify, and Python skills are a bonus. Based in Aylesbury, y...
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United Kingdom , Aylesbury
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65000.00 GBP / Year
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Eames Consulting
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Software Developer
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Whitehall Resources seeks an experienced Software Developer for a 2-month contract in Somerset (Inside IR35). You need 6+ years in safety-critical software, expertise in SPARK or ADA, and knowledge of standards like DO-178 or 61508. Lead technical strategy, mentor junior staff, and shape client s...
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United Kingdom , Somerset
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Not provided
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Whitehall Resources Ltd
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Junior Software Developer
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Join a collaborative UK-based team as a Junior Software Developer. You'll build PHP (Laravel) and web development skills across the full lifecycle, from coding to deployment. Ideal for graduates with a Bachelor's in CS/IT and basic HTML, CSS, JavaScript, and SQL knowledge. Enjoy 25 days leave, ca...
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United Kingdom
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Not provided
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360 Resourcing Solutions
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Full Stack Developer
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Join Barclays in London as a Full Stack Developer, driving innovation within investment banking’s Securitized Products division. Leverage your Angular and Core Java expertise to design high-quality software, mentor teams, and align technical solutions with business goals. Experience with Oracle, ...
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United Kingdom , London
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Barclays
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Senior Front Office Developer
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Senior Front Office Developer sought by Barclays in London to design and deliver high-quality software solutions using Python, Java, and .NET. You will tackle server-side and multi-threaded development in an Agile environment, collaborating across regions. Ideal candidates bring experience in web...
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United Kingdom , London
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Barclays
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Java (Kotlin) Developer (Agile, Test-Driven) Avp
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Join Citi as a Java (Kotlin) Developer (AVP) in London and engineer the future of global finance. You'll drive agile, test-driven development on the Core Prime Brokerage platform, leveraging CI/CD and automated testing. Essential skills include Java, TDD, and Kotlin experience is a plus. Enjoy 27...
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United Kingdom , London
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Citi
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IT Integration Developer
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Seeking an IT Integration Developer in London to bridge internal systems with cloud SaaS platforms. You will design secure, event-driven API integrations using Azure Integration Services (API Management, Logic Apps, Functions). Ideal for experts in API security, OAuth 2.0, and middleware developm...
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United Kingdom , London
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80000.00 GBP / Year
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Transact
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Fx It Developer
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Join a London-based FX team as an FX IT Developer, building and enhancing front-office trading systems. You’ll collaborate with traders and analysts, using C# or Java and SQL to deliver agile projects. Ideal for recent graduates (2:1+) with a passion for financial markets and strong communication...
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United Kingdom , London
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Crédit Agricole
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Cloud Application Developer
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Lead cloud development at DXC Technology as a Cloud Application Developer, driving secure, scalable solutions on Azure and AWS. This UK-based role demands expertise in Kubernetes, Terraform, and CI/CD, plus team leadership. Enjoy a competitive salary, private healthcare, and career development in...
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United Kingdom , Any City
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DXC Technology
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Salesforce Junior Developer
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Seeking a **Salesforce Junior Developer** in **London** to join an Agile team. You need 3+ years of experience with **Apex**, **Lightning Web Components**, and **OmniScript**. Key duties include configuring Sales/Service Clouds, implementing **Salesforce Flows**, and tailoring Lightning Record pa...
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United Kingdom , London
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NTT DATA
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Payment Solution Business Developer (POS)
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We are seeking a driven Payment Solution Business Developer (POS) to drive high-growth revenue in London. You will deploy and expand POS solutions through consultative selling, hunting new opportunities, and upselling to existing merchants. Ideal candidates possess proven POS sales experience and...
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United Kingdom , London
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Treatwel Industries
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Senior C++ Developer
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Senior C++ Developer sought to shape the future of betting and gaming at Betfred in Manchester. Leverage 8+ years of C++20 and Qt/QML 6 expertise to lead technical direction, design high-performance APIs, and drive DevOps best practices. Join a global leader migrating to a proprietary platform, o...
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United Kingdom , Manchester
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50000.00 - 65000.00 GBP / Year
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360 Resourcing Solutions
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Principal Linux/Android Platform Developer
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Principal Linux/Android Platform Developer sought by a leading secure communications firm in Cambridge, UK. You will drive AOSP customisation, Linux kernel tuning, and performance optimisation for next-gen broadband devices. Requires deep expertise in Android architecture, C++ in embedded/real-ti...
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United Kingdom , Cambridge
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70000.00 GBP / Year
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rmg digital
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Integrated Financial Crime Model Developer
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Join Barclays in London as an Integrated Financial Crime Model Developer. Design, build, and deploy machine learning models to enhance scalable, high-quality financial crime detection. Requires advanced Python, Databricks, and strong software engineering skills. Benefit from hybrid working, a wel...
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United Kingdom , London
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Barclays
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Python Developer
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United Kingdom , London
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Talan
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12 Month Internship - It Developer
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Join our London team as a 12-month IT Developer Intern, working directly with traders and risk analysts in foreign exchange trading. You’ll develop and enhance front-office systems using C# or Java, with exposure to SQL and Python. Ideal for recent graduates (2:1+) with strong analytical skills a...
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United Kingdom , London
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Crédit Agricole
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Full Stack Developer
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United Kingdom , London
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Barclays
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Mainframe Developer
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Join Barclays in Knutsford as a Mainframe Developer to drive digital innovation. Leverage expertise in COBOL, Hogan, JCL, DB2, and CICS to build secure, scalable infrastructure. Collaborate on high-quality software solutions while enjoying benefits like private medical care, life assurance, and a...
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United Kingdom , Knutsford
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Barclays
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Lead Developer
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United Kingdom , Manchester
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60000.00 - 75000.00 GBP / Year
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360 Resourcing Solutions
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Senior Kdb+ Developer
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United Kingdom , London
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Barclays
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About the Developer role

Discover the dynamic world of developer jobs, a cornerstone of the modern digital economy. Developers are the creative and technical masterminds behind the software, applications, and systems that power our daily lives. From the websites we browse to the mobile apps we use and the complex enterprise software running global businesses, developers are the architects of our digital future. This profession involves designing, coding, testing, and maintaining the software that drives innovation across every industry.

A developer's primary responsibility is the entire software development lifecycle. This begins with analyzing user needs and then designing robust software solutions to meet those requirements. The core of the role involves writing clean, efficient, and well-documented code in various programming languages. Developers build and maintain the backbone of applications, which includes creating and managing Application Programming Interfaces (APIs), backend services, and database structures. They are responsible for implementing key architectural patterns like microservices to ensure systems are scalable, reliable, and performant. A significant part of their work involves integrating different systems, such as connecting applications to databases, message queues, and third-party services.

Beyond initial creation, developers are tasked with continuous improvement and maintenance. This includes identifying and fixing bugs, optimizing applications for speed and stability, and implementing security best practices to protect against vulnerabilities. They conduct rigorous testing, including unit and integration tests, to ensure software quality. Furthermore, developers collaborate closely with other teams, such as frontend engineers, quality assurance (QA) specialists, and DevOps teams, to enable seamless continuous integration and deployment (CI/CD) pipelines. In many modern environments, developers also work on containerizing applications using tools like Docker and orchestrating them with platforms like Kubernetes. For senior and leadership roles, responsibilities expand to include mentoring junior team members, managing project timelines, making strategic technology decisions, and overseeing a team's output and professional development.

Typical skills and requirements for developer jobs are diverse. A strong foundation in computer science principles is essential. Proficiency in one or more programming languages (such as Go, Java, Python, JavaScript, or C#) is a fundamental requirement. Developers must understand software architecture, including concepts like RESTful APIs, microservices, and event-driven systems. Experience with databases (SQL and NoSQL), version control systems like Git, and operating systems is standard. As the field evolves, knowledge of cloud platforms (AWS, Azure, GCP), containerization, and infrastructure-as-code is increasingly valuable. Crucially, soft skills are just as important; problem-solving abilities, analytical thinking, clear communication, and the capacity to work collaboratively in a team are highly sought after. Most positions require a bachelor's degree in computer science or a related field, or equivalent practical experience. Whether you are an entry-level programmer or an experienced applications development manager, developer jobs offer a challenging and rewarding career path for those passionate about building the technology of tomorrow.