Back End Developer

Consortia Group; City Of London; On-site; GBP 50,000 - 70,000; Full time

Job summary

A high-growth tech scale-up in London is seeking a mid-to-senior Backend Developer to design and maintain scalable backend infrastructure using Node.js. The ideal candidate will have solid experience with PostgreSQL and RESTful APIs in a collaborative, start-up-like environment. This role offers a hybrid work setup and the chance to directly impact a high-performance platform.

Qualifications

• Solid commercial experience in Node.js backend development.
• Strong skills in PostgreSQL and optional MongoDB.
• Experience building and scaling REST APIs.

Responsibilities

• Design, build, and maintain robust backend services using Node.js.
• Write efficient SQL queries and optimize PostgreSQL performance.
• Develop clean, scalable RESTful APIs and maintain well-documented code.

Skills

Node.js backend development

PostgreSQL

REST API development

Git workflows

Job description

Backend Developer | Node.js | Hybrid (London)

Are you ready to join a high-growth, award-winning tech scale-up building real-time immersive visualisation platforms powered by 3D and AI?

This is an opportunity to work in a fast-paced, highly collaborative environment where your skills will directly impact the development of high-performance backend systems. You’ll be joining a tight-knit engineering team and working on the latest iteration of a platform that’s genuinely changing the game in its space.

We’re looking for a solid mid-to-senior Backend Developer to build scalable, efficient APIs and backend infrastructure. It’s 100% backend (no frontend expectations), and ideal for someone who enjoys clean architecture, optimised systems, and getting stuck into robust backend services. You’ll thrive here if you’ve previously worked in a start-up or scale-up, love working in a fast-moving team, adapt easily to change, and want to grow in a culture that values innovation, autonomy, and hands-on impact. It's not a corporate environment.

What you’ll be doing:
You’ll be designing, building, and maintaining robust backend services using Node.js, with a strong focus on performance and scalability. Day to day, you'll be writing efficient SQL queries, optimising PostgreSQL performance, and developing clean, scalable RESTful APIs. You'll collaborate closely with DevOps, frontend, and data teams, ensuring seamless integration across the platform. Testing, profiling, and maintaining well-documented code will also form a key part of your role, helping to ensure reliability and maintainability as the platform evolves.

What we’re looking for:

• Solid commercial experience in Node.js backend development

• Strong skills in PostgreSQL (and optionally MongoDB)

• Experience building and scaling REST APIs

• Familiarity with Git workflows and clean coding practices

• Comfortable in a start-up-like, collaborative environment

Consortia is a specialist recruitment agency, focused on connecting professionals within UX, Product, Data, and Engineering with global opportunities.

Please note that due to high application volumes, we may not be able to respond to every applicant individually. However, we will retain your details for consideration in future relevant roles.