Software Engineer, Java Backend

Jobtailor; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Jobtailor in London is pursuing backend engineers to advance greenfield development and modernize existing systems. You will build REST APIs and design microservices using Java and PostgreSQL, under Spring Boot, to power fintech platforms.

The role emphasizes clean, maintainable code, TDD and DDD, and a strong CI/CD mindset for scalable delivery in a fast-paced environment.

Qualifications

• Fluent in backend development with Java
• Bachelor's degree in CS/Engineering or related field
• Able to learn quickly and deliver results
• Excellent communication in English, both written and spoken
• Experience building complex products in hypergrowth startups

Responsibilities

• Focus on greenfield development and improving existing systems.
• Build REST APIs and engineer microservices for fintech platforms.
• Evolve systems supporting card payments, treasury management, and crypto liquidity.
• Develop predominantly with Java and PostgreSQL, leveraging Spring Boot and best practices.

Skills

Java

English fluency

Communication skills

Results driven

Education

Bachelor's Degree in Computer Science

Bachelor's Degree in Mathematics

Bachelor's Degree in Physics

Bachelor's Degree in Engineering

Tools

PostgreSQL

Spring Boot

REST API

Microservices

TDD

DDD

CI/CD

Clean Code

Job description

• Focus on greenfield development and improvement of existing systems
• Build REST APIs
• Engineer microservices
• Evolve systems supporting card payments, treasury management, transaction booking, and crypto liquidity
• Develop predominantly with Java 25 on the backend and PostgreSQL
• Use Spring Boot for delivery
• Develop business logic with emphasis on clean, maintainable code
• Apply TDD and DDD
• Use continuous integration and delivery
• Collaborate with a talented team to create solutions that drive financial inclusion and transform how people manage money

Requirements

• Demonstrable experience in Backend development, with fluency in Java
• Bachelor's Degree (or above) in Computer Science, Mathematics, Physics, or other Engineering / Science disciplines
• Quick learner with an ambitious and results driven personality
• Excellent communication skills, including English fluency, verbal and written
• Track record of building complex products that millions of people use in hypergrowth startups

Core Competencies

Proficient in Backend Development with a strong focus on Java 25, PostgreSQL, and Spring Boot, emphasizing clean code and best practices like TDD and DDD. Experienced in building REST APIs and microservices to support financial systems and enhance user experience.

Highest-signal resume keywords

• Java 25
• PostgreSQL
• Spring Boot
• Backend Development
• REST API Development

ATS Optimization Keywords

Hard Skills

• Backend Development
• Java 25
• PostgreSQL
• REST API Development
• Microservices Engineering
• TDD
• DDD
• Continuous Integration
• Continuous Delivery
• Clean Code Practices

Soft Skills

• Excellent Communication Skills
• Quick Learner
• Results Driven

Certifications & Qualifications

• Bachelor's Degree in Computer Science
• Bachelor's Degree in Mathematics
• Bachelor's Degree in Physics
• Bachelor's Degree in Engineering

Industry Keywords

• Financial Inclusion
• Card Payments
• Treasury Management
• Transaction Booking
• Crypto Liquidity
• Hypergrowth Startups