Average Fullstack Developer salary in the UK

Avanti is working with an established software business that is investing heavily in the modernisation of one of it's core platforms and is looking for a Senior Fullstack .NET Developer with strong experience in React. This is a hands-on engineering role where you'll help evolve an established business-critical application into a more modern, scalable architecture.The focus will be on improving the underlying platform, building modern services and APIs, increasing automated test coverage and gradually moving functionality towards a modern web-based frontend.You'll remain very hands-on with C#/.NET development while also contributing to software design, architecture and technical decisions across the wider engineering team.The business places a strong emphasis on the engineering quality, automated testing and test-first development, so strong TDD experience is essential. What you'll be doingBuilding and maintaining applications and services using C# and modern .NETDesigning and developing REST APIsDeveloping frontend functionality using ReactHelping modernise an established application architectureImproving automated test coverage and overall code qualityWorking in a test-first development environmentContributing to software design and architecture decisionsImproving platform maintainability, scalability and long-term technical directionSupporting existing systems while helping build their future replacement Technology Environment: C# / .NET 8 REST APIsReactSQL ServerAutomated testingTDDCI/CDCloud technologies There is also some exposure to established desktop WinForms technologies within the existing platform, although previous experience in this area is not essential.Essential Skills: Strong C#/.NET React TDD REST APIs CI/CD knowledge Experience contributing to architecture / design and technical decisions Ability to work independently and take ownership of technical problems Experience with cloud platforms, legacy application modernisation or AI-assisted development would be useful. Working arrangementThe role is remote first, with some initial time spent with the team during onboarding, and occasional in person collaboration thereafter (West London / M4 corridor) – costs covered. Interview processThe process will involve an initial video call which will be a technical discussion, followed by a final-stage video interview including a practical coding element following TDD. PackageSalary up to £70,000, plus pension, holiday allowance and additional employee benefits.If interested in the position then click Apply Now!!

Full Stack Developer - Python / JavaScript / Typescript (Contract)Location: London - Hybrid, 2 days/week on-siteContract: Initial 6 months (view to extend)Rate: £650–£750 per dayOverviewA global retail business is looking for a Full Stack Python Developer to join their technology team on an initial 6-month contract. This is a hands-on role building and maintaining customer-facing and internal platforms, working across the full stack with a Python-based backend. The role is hybrid, with 2 days per week required on-site at the client's London office.ResponsibilitiesDesign, build and maintain full stack web applications with a Python backendDevelop and consume RESTful APIsWork across both backend services and frontend interfacesCollaborate with cross-functional teams including product, QA and other engineersWrite clean, tested, maintainable code and participate in code reviewContribute to architecture and technical decision-making within the teamTroubleshoot and resolve issues across the stack in a production environmentSkills & ExperienceStrong commercial experience as a Full Stack Developer with Python (Django or Flask)Experience with JavaScript and TypescriptSolid frontend experience (React, Vue or similar JS framework)Experience with relational databases (PostgreSQL, MySQL) and API designFamiliarity with cloud platforms (AWS/Azure/GCP) and CI/CD pipelinesComfortable working in an agile environmentExperience in retail, e-commerce or high-traffic consumer platforms is advantageousMust be able to work on-site in London 2 days per weekContract DetailsDuration: 6 months initial, likely extensionRate: £650–£750 per day (Inside IR35)Location: London – Hybrid (2 days on-site)

Discover your future at CitiWorking at Citi is far more than just a job. A career with us means joining a team of approximately 219,000 dedicated people from around the globe. At Citi, you'll have the opportunity to grow your career, give back to your community and make a real impact. Job OverviewPosition SummaryThe Front End (UI) Software Engineer is a senior-level position responsible for establishing, architecting, and implementing new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to lead applications systems analysis, frontend architecture, and fullstack programming activities. This role specifically focuses on leading the development of scalable, secure, and modern Front End (UI) digital platforms with Fullstack capabilities. The lead engineer will set architectural standards for enterprise-grade web applications, drive UI component libraries and design system adherence, establish best practices for API integration and backend services, and mentor development teams across the software delivery lifecycle. Key ResponsibilitiesTechnical Leadership & Core Applications Development Architectural Alignment & System Design: Provide expertise in frontend/fullstack applications programming and ensure application design strictly adheres to the overall enterprise architecture blueprint, security standards, and technology roadmap. Standards & Engineering Governance: Utilize advanced knowledge of system flow to develop and enforce robust standards for UI coding, component reusability, testing automation, debugging, performance profiling, and CI/CD deployment. Frontend & UI Engineering: Lead the architecture and implementation of responsive, accessible (WCAG 2.1 AA), and performant web applications using modern frameworks (e.g., React, TypeScript, Next.js/Angular) and enterprise design systems. Fullstack Integration & API Design: Lead end-to-end integration by designing, consuming, and optimizing RESTful APIs, GraphQL endpoints, Backend-for-Frontend (BFF) layers, and microservices (e.g., Node.js, Java/Spring Boot, or Python). Cross-Functional Collaboration: Partner with multiple management teams, product owners, UX/UI designers, and backend engineering teams to ensure appropriate integration of functions to meet business goals, identifying and defining necessary system enhancements to deploy new products and process improvements. Complex Problem Solving: Resolve a variety of high-impact problems and complex projects through in-depth evaluation of complex business processes, system processes, data flows, and industry standards. Cross-Domain Integration: Develop comprehensive knowledge of how areas of business-such as enterprise architecture, infrastructure, cloud platforms, and security-integrate to accomplish strategic business goals. Innovative Solution Delivery: Provide in-depth analysis with interpretive thinking to define critical technical issues and engineer innovative, resilient solutions.. Risk Management, Governance & Controls Risk & Compliance Safeguarding: Appropriately assess risk when business and technical decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients, and assets, by driving compliance with applicable laws, rules, and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct, and business practices, and escalating, managing, and reporting control issues with transparency. Security & Data Privacy: Ensure all developed user interfaces and application workflows adhere to rigorous enterprise cyber security standards (e.g., SSO/OAuth2/OIDC, XSS/CSRF mitigation, secure session management, and vulnerability remediation). Recommended Qualifications Experience: Extensive relevant professional experience in an Applications Development or systems analysis role, with demonstrated expertise in UI/Frontend engineering and fullstack delivery. Technical SME: Subject Matter Expert (SME) in at least one core area of modern frontend development (e.g., React/TypeScript ecosystem, Micro-frontends, Design Systems, State Management) with strong working competency in backend integration (Node.js, Java, Python, or REST/GraphQL APIs). System Analysis & Implementation: Extensive experience in software systems analysis, programming, and architecture of enterprise web applications. Project & Delivery Track Record: Proven track record of managing and successfully delivering complex, high-impact technology projects within an Agile/Scrum framework. Adaptability: Demonstrated ability to adjust priorities quickly and effectively as business and technical circumstances dictate. Leadership Skills: Demonstrated technical leadership, project coordination, and mentoring skills. Communication: Consistently demonstrates clear, concise, and professional written and verbal communication skills across technical and executive stakeholders. This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required. What we'll provide youBy joining Citi, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as: 27 days annual leave (plus bank holidays)A discretional annual performance related bonusPrivate Medical Care & Life InsuranceEmployee Assistance ProgramPension PlanPaid Parental LeaveSpecial discounts for employees, family, and friendsAccess to an array of learning and development resources Visit our Global Benefits page to learn more. Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive. ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family:<