Staff Fullstack Engineer

Methodfi; Milton Keynes; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading financial technology firm in Milton Keynes is looking for a Staff Full-stack Engineer to create cross-squad leverage by simplifying architecture and improving reliability across digital products. The ideal candidate will be proficient in JavaScript, TypeScript, and React, with strong mentoring skills and experience in backend services using Kotlin. This role offers opportunities for innovation and growth within a collaborative environment.

Benefits

Full onboarding support

Flexible working options

Regular social activities

Pension contributions

Discretionary bonus scheme

Private health cover

Life assurance

Family friendly policies including enhanced Maternity & Paternity leave

Qualifications

• Expert knowledge of JavaScript, TypeScript, React with Hooks, and Redux.
• Experience with testing tools such as Jest and Cypress.
• Strong understanding of CI/CD and DevOps practices.

Responsibilities

• Define and implement cross-squad technical patterns.
• Design, develop and deploy high-quality web applications.
• Mentor engineers and drive the adoption of GenAI tools.

Skills

JavaScript

TypeScript

React with Hooks

HTML5

SASS/CSS

Unit testing

Integration testing

End-to-end testing

Strong communication skills

Mentoring

Tools

Jest

React Testing Library

Playwright

Cypress

Azure DevOps Pipelines

Job description

About Allica Bank

Allica is the UK’s fastest growing company - and the fastest-growing financial technology (Fintech) firm ever. Our purpose is to help established SMEs, one of the last major underserved opportunities in Fintech.

Established SMEs are the backbone of local communities - representing over a third of our economy - yet have been largely neglected both by traditional high street banks and modern fintech providers.

Department Description

Technology sits at the centre of Allica. We design and build the platforms that power the bank, working closely with every part of the business to deliver real impact for customers. Our teams move quickly, focus on outcomes, and take ownership from concept through to delivery. We solve complex problems, modernise processes, and enable the business to scale with confidence.

What makes us different is the level of influence and autonomy engineers have. We work without the weight of legacy systems, which means we can focus on building for the future. Everyone contributes ideas and helps shape how we operate, and roles evolve as the organisation grows. This is a place for people who want to have a tangible impact and do their best work in a modern, collaborative environment.

Role Description

• The Staff Full-stack Engineer sits within the Payments tribe. The purpose of the role is to create cross-squad leverage by simplifying architecture, defining shared patterns, and improving reliability and compliance at scale.

• You will use your expertise in web technologies and backend systems to shape how payments flow through our digital products. You will define and roll out technical patterns that are used across multiple squads, including authentication, design system tokens and tracing. You will reduce complexity, improve delivery consistency and support teams in building scalable systems.

• The role involves setting direction for both frontend and backend components. On the frontend, this includes React and TypeScript. On the backend, this includes Kotlin services using REST and OpenAPI. You will set standards for security, performance, and operational excellence, and you will work closely with Product and Design to ensure technical strategies support business goals.

• A key responsibility is to support the growth of engineering capability across multiple squads. You will mentor engineers, share knowledge, and drive the adoption of shared tools and practices, including responsible use of GenAI technologies such as GitHub Copilot.

• Success in this role is measured by improvements in the consistency, reliability, and speed of delivery across squads, as well as the quality and security of the systems they build.

Principal Accountabilities

• Define and implement cross-squad technical patterns such as authentication, design system tokens, tracing.

• Design, develop and deploy high-quality web applications using React and TypeScript.

• Design and deliver scalable backend services using Kotlin.

• Establish SLOs and incident management practices across key services to improve reliability.

• Partner with Product and Design to align technical strategies with product roadmaps.

• Implement and maintain security and privacy guardrails across services.

• Lead the adoption of approved GenAI tools, setting standards and supporting engineers in their use.

• Foster a culture of continuous improvement through active participation in communities of practice.

• Mentor engineers across squads through pairing, code reviews, architectural guidance and career development support.

• Encourage broad participation in communities of practice to share knowledge and improve standards across the organisation.

Personal Attributes & Experience

• Expert knowledge of JavaScript, TypeScript, React with Hooks, Redux, HTML5 and SASS/CSS.

• Strong experience with unit, integration and end-to-end testing using tools such as Jest, React Testing Library, Playwright or Cypress.

• Experience designing and delivering backend services in Kotlin or Java using REST and OpenAPI.

• Experience in system design at scale and the ability to simplify architectures across multiple teams.

• Strong understanding of CI/CD and DevOps practices. Experience with Azure DevOps Pipelines is beneficial.

• Familiarity with Nx and Micro Frontend architectures is advantageous.

• Knowledge of UX and UI principles and experience working closely with design teams.

• Excellent communication skills and the ability to influence multiple teams and stakeholders.

• Proven experience mentoring engineers and improving team capability.

• Experience introducing and scaling the use of new tools and standards across teams, including GenAI technologies.

Working at Allica Bank

At Allica Bank we want to ensure our employees have the right tools and environment in which to succeed in their role and in support of our customers.

Our employees are at the heart of everything we do, so our benefits are designed with you in mind:

• Full onboarding support and continued development opportunities
• Options for flexible working
• Regular social activities
• Pension contributions
• Discretionary bonus scheme
• Private health cover
• Life assurance
• Family friendly policies including enhanced Maternity & Paternity leave

Don’t tick every box?

Don’t worry if you don’t have all the skills or requirements listed on the job description. If you think you’ll be a good fit, we’d still love to hear from you!

Flexible working

We know the ‘9-to-5’ isn’t right for everyone. That’s why Allica Bank is fully committed to flexible and hybrid working. Please let us know what is best for you and, if we can, we will do our best to accommodate.

Diversity

We’re a diverse bunch here at Allica, with all kinds of experiences, backgrounds and lifestyles. Our openness and differences make us stronger, and we want everybody to feel comfortable bringing as much of themselves to work with them as they like.