Full-Stack Developer (MERN)

Full-Stack Developer (MERN) – AI SaaS

Location: United Kingdom – Remote

Employment type: Full-time, permanent

Salary: £55,000–£70,000 per year, depending on experience

About Vyera

Vyera is building an AI-powered platform that helps businesses understand their market, monitor competitors, identify opportunities and turn intelligence into action.

Instead of simply displaying data, Vyera’s specialised agents help users move from live market signals to strategy, content and completed work.

We are looking for a strong Full-Stack Developer to help build and scale the platform across the frontend, backend, integrations and core product infrastructure.

The role

You will work across Vyera’s MERN stack to build production features used throughout the platform.

This is a hands-on product engineering role. You will own features from technical planning through development, testing and deployment. You will work closely with the wider product, design and engineering team while having meaningful input into how the platform is built.

You will be joining at an early stage, so your work will directly influence the product, engineering standards and customer experience.

What you’ll work on

* AI-powered workflows that turn market data into useful outputs and actions

* Competitive-intelligence feeds, dashboards and reporting experiences

* Content, strategy and execution tools powered by specialised AI agents

* External integrations with social platforms, analytics tools and business software

* Background jobs, notifications and data-processing workflows

* Secure account, workspace, subscription and permission systems

* Reliable, responsive interfaces for complex data and AI-generated outputs

* Performance, scalability and product reliability as usage grows

What you’ll be responsible for

* Building and maintaining responsive web applications using React and TypeScript

* Developing secure backend services and APIs with Node.js and Express.js

* Designing and maintaining MongoDB schemas, queries and indexes

* Taking features from requirements and designs through to production

* Integrating third-party APIs, webhooks and authentication flows

* Integrating LLM and AI services into reliable product workflows

* Writing clean, maintainable and testable code

* Diagnosing performance issues and resolving production bugs

* Reviewing code and contributing to technical decisions

* Improving testing, documentation and development standards

* Working closely with designers and developers to deliver polished features

* Communicating progress, risks and technical trade-offs clearly

What we’re looking for

* At least two years of professional full-stack development experience

* Strong commercial experience with React, Node.js, Express.js and MongoDB

* Strong JavaScript and TypeScript fundamentals

* Experience designing and consuming REST APIs

* Experience building responsive, production-quality interfaces

* Good understanding of authentication, authorisation and application security

* Experience with Git, pull requests and collaborative development

* Ability to structure features cleanly across the frontend and backend

* Confidence debugging unfamiliar code and solving problems independently

* Strong written and verbal communication

* A product mindset: you care about usability, reliability and the customer outcome, not only whether the code runs

Useful but not essential

* Experience with Next.js

* Experience integrating OpenAI, Anthropic or other LLM APIs

* Experience with AWS or comparable cloud infrastructure

* Experience with Redis, queues or asynchronous background jobs

* Experience with Docker and CI/CD pipelines

* Experience with automated testing

* Experience building analytics dashboards or data-heavy interfaces

* Experience with SaaS subscriptions, permissions or multi-tenant architecture

* Previous experience in an early-stage SaaS company

You do not need to meet every preferred requirement. If you have strong MERN fundamentals, have shipped real products and can demonstrate ownership of your work, we would still like to hear from you.

What you’ll get

* £55,000–£70,000 annual salary, based on experience

* A full-time, permanent position

* Remote working

* Direct ownership of meaningful product features

* The opportunity to help shape an AI SaaS platform at an early stage

* Close collaboration with product, design and engineering

* Clear scope to grow with the product and take on greater technical responsibility

* Paid annual leave and workplace pension in accordance with your employment terms and eligibility

Our hiring process

1. Application and portfolio review

2. Short introductory conversation

3. Technical interview focused on work you have actually built

4. Short practical assessment or live technical exercise

5. Final conversation and offer

We do not use unpaid multi-day projects as part of the hiring process.

How to apply

Apply through LinkedIn with your CV and include:

* Your GitHub, portfolio or examples of production work

* A short explanation of the most technically challenging feature you have built

* Your specific contribution to that feature

* Your current notice period

Applications without relevant full-stack experience may not progress.

Vyera is committed to providing an inclusive recruitment process. We assess applicants based on their ability, experience and suitability for the role.