Full Stack Engineer

Harnham - Data & Analytics Recruitment; Greater London; Hybrid; GBP 75,000 - 90,000; Full time

Benefits offered by this job

Salary up to £90,000

Equity

Flexible hybrid working

Ownership from day one

Direct access to leadership

Clear progression opportunities

Job summary

Harnham - Data & Analytics Recruitment is seeking a Full Stack Engineer for a London-based hybrid role (Waterloo/London Bridge). You will join early-stage tech company as one of the first software hires, owning the stack from mobile apps to backend services and cloud infrastructure.

Role focuses on building scalable cloud services, shipping mobile apps, and shaping engineering processes as the team grows, with clear progression opportunities and significant equity from day one.

Qualifications

• Experience as a Full Stack Engineer or Mobile Software Engineer.
• Experience building and shipping mobile applications.
• Cloud engineering experience with AWS and PostgreSQL.
• Proficient with Docker and GitHub.
• Experience in startup or high-growth environments.

Responsibilities

• Own and develop cloud backend services and infrastructure.
• Build and enhance mobile applications.
• Collaborate across mobile, cloud and connected-device environments.
• Support Bluetooth connectivity and device communications.
• Help bring software development fully in-house.
• Collaborate with founders, product and design teams.
• Contribute to architecture, scalability and engineering best practices.
• Play a key role in the growth of the software function.

Skills

Full Stack Engineer

Mobile Software Engineer

AWS

PostgreSQL

Docker

GitHub

React Native

Bluetooth / BLE / IoT

Frontend / Backend / Infrastructure

Tools

AWS

PostgreSQL

Docker

GitHub

Job description

Full Stack Engineer

London (Hybrid, Waterloo/London Bridge) Up to £90,000 + Equity

This is a rare opportunity to join an early-stage technology company as one of its first software engineering hires. With a product already in market, strong commercial traction, and fresh investment secured, you'll have significant ownership across the platform while helping shape the future of the engineering function.

The Company

They are a fast-growing technology business developing a connected hardware and software product used by a growing customer base. Having successfully launched their product and generated strong early revenue, they are now scaling both the platform and the team. The business combines mobile applications, cloud infrastructure, and connected-device technology to deliver a highly innovative user experience.

The Role

You will work across the full technology stack, helping scale both the product and engineering capability.

Responsibilities include:

• Owning and developing cloud backend services and infrastructure
• Building and enhancing mobile applications
• Working across mobile, cloud, and connected-device environments
• Supporting Bluetooth connectivity and device communications
• Helping bring software development fully in-house
• Collaborating closely with founders, product, and design teams
• Contributing to architecture, scalability, and engineering best practices
• Playing a key role in the growth of the software function

Your Skills & Experience

• Strong commercial experience as a Full Stack Engineer or Mobile Software Engineer
• Experience building and shipping mobile applications
• Strong cloud engineering experience, ideally within AWS
• Solid understanding of software engineering fundamentals
• Experience working in startup or high-growth environments
• Ability to operate across frontend, backend, and infrastructure
• Experience with AWS, PostgreSQL, Docker, and GitHub
• Exposure to React Native is beneficial
• Experience with Bluetooth, BLE, IoT, or connected devices is advantageous
• Passion for engineering, product development, and continuous improvement

What They Offer

• Salary up to £90,000
• Meaningful equity package
• Flexible hybrid working
• Significant ownership from day one
• Direct access to company leadership
• Clear progression opportunities as the business scales
• Opportunity to shape engineering culture, processes, and technology decisions
• Long-term potential to grow into a leadership position