Junior Backend Engineer

trg.; United Kingdom; On-site; GBP 30,000 - 42,000; Full time

Job summary

trg. is a UK fintech building an AI-powered autonomous savings product. The role starts as supervised backend work, growing as you prove yourself, with real mentorship and real impact: code reaches customers quickly.

You'll mainly develop backend services in Java/Spring on AWS, work with event-driven systems (Kafka, event sourcing) and contribute to APIs, data and integration across the stack, under guidance from the CTO.

Qualifications

• CS degree or equivalent self-taught experience.
• Strong Java fundamentals with practical coding projects.
• Willing to learn payments/fintech and fintech domain basics.
• UK-based with right to work in the UK.

Responsibilities

• Build and test backend services in Java/Spring on AWS.
• Work with event-driven systems (Kafka, event sourcing).
• Write clean, well-tested code and participate in code reviews.
• Contribute to APIs, data and integration work across the stack.

Skills

Java

Education

Bachelor's degree in Computer Science

Equivalent self-taught experience

Tools

Spring

AWS

SQL

Python

Flutter/Dart

Job description

A UK fintech building an AI-powered autonomous savings product - an app that automatically manages customers' money across accounts to help them earn a better return. The company is pre-launch, well-funded by seed investors, and building core financial infrastructure from the ground up.

The company is hiring a graduate/junior backend engineer to work alongside the CTO on the systems that power the product, the money-movement engine, ledger and APIs. The successful candidate will start on well-scoped, supervised backend work and grow into more responsibility as they prove themselves. Hands-on, with real mentorship and real impact: code reaches customers quickly.

What you'll do

• Build and test backend services in Java/Spring on AWS.
• Work with event-driven systems (Kafka, event sourcing) while learning the architecture.
• Write clean, well-tested code and take feedback through code review.
• Contribute to APIs, data and integration work across the stack.

What they're looking for

• Solid Java fundamentals (from a Computer Science degree or equivalent self-taught experience).
• Evidence of building things and teaching yourself fast - a side project, dissertation, hackathon or open-source work.
• Care for clean, correct code and a willingness to learn payments/fintech.
• UK-based, with the right to work in the UK.

Nice to have (not essential)

• Any exposure to Spring, AWS, SQL, Python, Flutter/Dart or event-driven systems.
• Interest in fintech, open banking or AI agents.