Backend Engineer

London Source: WhatJobs

See advert for pay

Overview

In this Backend Engineer role, you will build and operate production-grade backend services that power a rapidly growing FinTech/SaaS product. You will shape resilient, scalable systems and APIs, collaborating with cross-functional teams to support ambitious growth and cutting-edge tech adoption. The role emphasizes performance, reliability, and evolving stacks, with a strong focus on AI/ML integration and deterministic automated actions. This is a hybrid/remote opportunity with a fast-paced, learning-centric culture and significant impact on the product roadmap.

Responsibilities

Build and operate backend services (Node.js/Express, Python) in production
Design RESTful and event-driven APIs
Implement concurrency, locking, idempotency, and distributed consistency mechanisms
Integrate AI/ML or decisioning services into backend platforms
Develop safety, audit, and rollback mechanisms for automated execution
Deploy and operate Node.js services on AWS and manage CI/CD/infrastructure-as-code
Collaborate with peers in a fast-paced, growth-focused FinTech/SaaS environment
Contribute to scalable, data-driven financial/transaction systems

Key requirements

Production experience with Node.js/Express and Python
Strong familiarity with AWS (ECS/EKS, Lambda, SQS, EventBridge, RDS/DynamoDB, S3)
Experience designing RESTful and event-driven APIs
Relational data modelling experience (financial/transaction systems advantageous)
Experience with concurrency, locking, idempotency, distributed consistency
Experience with message queues, background workers, workflow orchestration
Hands-on experience deploying Node.js services on AWS
Experience with CI/CD and infrastructure-as-code and containerised workloads
Strong communication and collaborative skills
Experience in FinTech/SaaS is advantageous