Backend Engineer - FinTech / SaaS

Carousel Consultancy Ltd; Greater London; Hybrid; GBP 63,000 - 77,000; Full time

Job summary

Carousel Consultancy Ltd. is seeking a Backend Engineer for a rapid-growth FinTech/SaaS team in London with hybrid working. The role focuses on building scalable backend services using Node.js/Express or Python, integrating AWS managed services, and delivering robust RESTful and event-driven APIs.

The successful candidate will join a fast-paced, high-performance environment, contribute to AI/ML integrations where relevant, and drive best practices in deployment, testing and reliability.

Qualifications

• Graduate with CS/Engineering degree and 1+ years’ experience in FinTech/SaaS.
• Production backend experience with Node.js/Express or Python.
• AWS services including ECS/EKS, Lambda, SQS, EventBridge, RDS/DynamoDB, S3.
• Experience designing RESTful and event-driven APIs.

Responsibilities

• Build and operate scalable backend services using Node.js or Python.
• Design RESTful and event-driven APIs and data models.
• Collaborate with teams to deploy on AWS with CI/CD.

Skills

Node.js

Express

Python

AWS

RESTful APIs

Event-driven APIs

CI/CD

Infrastructure as Code

Containerization

AI/ML integration

Education

Bachelor’s degree in Computer Science / Engineering

Tools

AWS ECS/EKS

Lambda

SQS

EventBridge

RDS

DynamoDB

S3

Job description

Backend Engineer - Rapid-growth FinTech / SaaS - London / Hybrid -up to £70k (DoE)

We have an incredible opportunity for skilled, passionate and experienced Backend Engineers, with production experience with languages such as Node.js, Express, Python; familiarity with AWS (e.g. ECS/EKS, Lambda, SQS, EventBridge, RDS/DynamoDB, S3) and experience designing RESTful and event-driven APIs, to join a fantastic FinTech / SaaS on a hybrid working basis as soon as possible.

The Opportunity:

This is the perfect opportunity to join a successful FinTech SaaS, in a crucial role that is critical to the product’s success and the company’s future.

The Backend Engineer will need to have a passion for performance, a growth mindset and the drive to continuously learn, develop and improve. Our client encourages a learning culture and they embrace cutting-edge technology which will allow you to hone relevant, in-demand skills.

They are a rapidly scaling company, so this is a prime opportunity to get your foot in the door and join a dynamic, high-performance team on an exciting trajectory!

Our client is offering an annual salary up to £70k, dependent on experience and skillset.

What we’re looking for:

• Graduate with a relevant degree in Computer Science / Engineering or similar, with c1+ years’ relevant work experience, ideally within FinTech, TMS or SaaS (including internships)
• Proven production experience building and operating backend services (e.g. Node.js/Express, Python), with a technology-agnostic mindset and the ability to adapt to evolving stacks
• Familiarity with AWS (i.e. ECS/EKS, Lambda, SQS, EventBridge, RDS/DynamoDB, S3)
• Experience designing RESTful and event-driven APIs
• Relational data modelling skills (financial or transactional systems advantageous)
• Experience with concurrency, locking, idempotency and distributed consistency
• Experience with message queues, background workers and workflow orchestration
• Experience integrating AI/ML or decisioning services into backend platforms
• Comfortable building systems that consume AI outputs and execute deterministic actions
• Ability to design safety, audit and rollback mechanisms around automated executionUnderstanding of the role context plays in designing a modern AI-native system
• Hands-on experience deploying and operating Node.js services on AWS
• Experience with CI/CD, infrastructure-as-code and containerised workloads
• Drive to improve as an Engineer - eager to work with peers who push and support each other to continuously improve
• Strong communication skills and the ability to liaise at all levels
• Collaborative nature - ability to work independently and as part of a team
• Ability and desire to work in a fast-paced, rapid-growth environment
• Highly ambitious, driven and focused

Interested in this fantastic Backend Engineer opportunity?