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Principal Software Engineer

83zero
Lime Street, City And County Of the City Of London, United Kingdom
3 weeks ago
£110,000 – £130,000 pa

Salary

£110,000 – £130,000 pa

Job Type
Permanent
Work Pattern
Full-time
Work Location
Hybrid
Seniority
Lead
Education
Degree
Posted
20 Apr 2026 (3 weeks ago)

Benefits

10% bonus Flexible hybrid working model Private healthcare Enhanced pension 25 days annual leave Learning and development budget
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Principal Full Stack Software Engineer

Location: Hybrid - 1-2 days a week

Salary: £(Apply online only)k + 10% Bonus

Type: Permanent

No Sponsorship Available

Overview:

We are seeking a Principal Full Stack Software Engineer to lead the design, development, and delivery of scalable, high-performance applications across a modern cloud-based architecture. This is a senior, hands-on leadership role where you will shape technical direction, influence engineering standards, and drive best practice across the full software development lifecycle. You will work closely with product, architecture, and leadership teams to deliver robust, user-centric solutions while mentoring engineers and fostering a high-performing engineering culture.

Key Responsibilities:

Lead end-to-end design and development of full stack applications across frontend and backend systems

Define and drive engineering best practices, coding standards, and architectural principles

Act as a technical authority across multiple teams, guiding complex solution design and delivery

Build scalable, secure, and high-performing systems using modern frameworks and cloud technologies

Collaborate with Product Owners and stakeholders to translate business requirements into technical solutions

Mentor and coach engineers, supporting career development and technical growth

Drive adoption of DevOps practices, CI/CD pipelines, and automated testing frameworks

Contribute to strategic technology decisions and long-term roadmap planning

Ensure high levels of system reliability, performance, and security

Required Skills & Experience:

Extensive experience as a Full Stack Engineer with a strong track record in senior or principal-level roles

Expertise in JavaScript/TypeScript and modern frontend frameworks (e.g., React, Angular, or Vue)

Strong backend development experience (e.g., Node.js, Java, Python, or Go)

Proven experience designing and building scalable, distributed systems

Strong experience with REST APIs, microservices architecture, and event-driven systems

Cloud experience with Azure with knowledge of serverless and containerised architectures

Solid understanding of DevOps practices, CI/CD, and infrastructure as code

Experience working in Agile environments and leading technical delivery

Strong stakeholder engagement and communication skills

Desirable Experience:

Knowledge of data engineering or real-time data processing pipelines

Exposure to system design at enterprise scale

Experience working in regulated environments such as financial services

Benefits:

Competitive base salary and performance bonus

Flexible hybrid working model

Private healthcare and enhanced pension

25 days annual leave + additional benefits

Learning and development budget

Opportunity to shape engineering strategy within a growing organisation

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