Senior Backend Engineer: Own architecture & resilient systems

iO Associates; Bath; On-site; GBP 75,000 - 105,000; Full time

Job summary

iO Associates is seeking a Senior Backend Engineer to join a fast-growing fintech business operating in a highly regulated environment. You will own backend design, architecture and production systems, aiming for scalable, resilient services and robust incident handling.

Collaborating with Engineering, Product and Operations, you will drive CI/CD, observability and reliability improvements across a suite of business-critical platforms.

Qualifications

• Senior backend experience with TypeScript and Node.js.
• Experience in system design and building scalable, resilient architectures.
• Strong AWS experience (Lambda, API Gateway, DynamoDB and MongoDB).
• Knowledge of automation, CI/CD, and modern engineering practices.
• Experience in scale-up environments; fintech or regulated contexts is a plus.

Responsibilities

• Own system design, architecture, CI/CD, observability, incident response and production systems.
• Collaborate with Engineering, Product and Operations to improve reliable platforms.

Skills

TypeScript

Node.js

System design

AWS

CI/CD

Observability

Scale-up experience

Fintech/regulatory experience

Job description

iO Associates is seeking a Senior Backend Engineer to join a fast-growing fintech business operating in a highly regulated environment. You will own backend design, architecture and production systems, aiming for scalable, resilient services and robust incident handling.

Collaborating with Engineering, Product and Operations, you will drive CI/CD, observability and reliability improvements across a suite of business-critical platforms.