Back End Developer

Mekion Consulting; Greater London; On-site; GBP 65,000 - 85,000; Full time

Job summary

A regulated fintech company based in Greater London is seeking a Founding Engineer to design and build the core platform. This high-impact role involves owning production systems and shaping technical direction. Candidates should have strong experience with Node.js and PostgreSQL. The role provides an opportunity for significant responsibility and future leadership as the company evolves. Ideal for someone looking to grow within a dynamic, early-stage environment.

Qualifications

• Strong commercial experience with Node.js backend development.
• Solid experience with PostgreSQL, including schema design and performance tuning.
• Proven experience building and maintaining production APIs.

Responsibilities

• Design, build, and maintain backend services using Node.js.
• Own production systems: monitoring, incident response, and root-cause analysis.
• Implement secure authentication and authorization patterns.

Skills

Node.js backend development

PostgreSQL

Production API management

CI/CD with GitHub

Incident response

Data security and protection

Comfortable with regulated environments

Tools

GitHub

GitHub Actions

Job description

We’re looking for a Founding Engineer to help build and scale the core platform of a regulated fintech product. This is a high‑trust, high‑impact role for someone who enjoys ownership, understands production systems, and wants to grow with the company.

You’ll work closely with the CTO to design, build, and operate a secure, scalable API‑driven backend. From day one, you’ll have real responsibility for production systems and technical direction, with the opportunity to shape architecture, standards, and future hires as the company grows.

This role will evolve significantly over time— from hands‑on delivery today to broader technical leadership as the team expands.

Responsibilities

• Design, build, and maintain backend services using Node.js
• Develop and maintain API‑first systems
• Work with PostgreSQL, including schema design, migrations, and performance tuning
• Own production systems: monitoring, incident response, root‑cause analysis
• Debug live issues calmly and methodically
• Implement secure authentication and authorization patterns
• Contribute to CI/CD using GitHub and GitHub Actions
• Work within a regulated / compliance‑aware environment (fintech, financial services, or similar)
• Collaborate on architecture decisions and technical roadmap
• Improve engineering standards, documentation, and processes as the company scales

Required Experience

• Strong commercial experience with Node.js backend development
• Solid experience with PostgreSQL
• Proven experience building and maintaining production APIs
• Comfortable working with GitHub and GitHub Actions for CI/CD
• Experience supporting live systems and resolving production incidents
• Understanding of security, data protection, and operational risk
• Experience in fintech or other regulated environments (ideal but not strictly required)

What We’re Looking For

• Someone we can trust with production
• Comfortable taking ownership rather than waiting for direction
• Able to balance speed with correctness in a regulated context
• Interested in growing into a senior or lead role over time
• Happy working in an early‑stage environment where priorities evolve

Nice to Have

• Experience in financial services, payments, or investment platforms
• Cloud infrastructure (GCP, AWS, or similar)
• Authentication flows, KYC/AML, or compliance‑driven systems