Senior Back-end Engineer

Calyptus; Bristol; On-site; GBP 70,000 - 90,000; Full time

Job summary

A tech-driven B2B solutions provider in the United Kingdom seeks a Senior Backend Developer to lead the design and development of their SaaS platform. Candidates should have over 7 years of experience in back-end development utilizing Java and Spring Boot, including hands-on microservices architecture and strong AWS knowledge. The role requires a deep understanding of RESTful APIs, a commitment to best practices, and an ability to mentor and grow teams within a collaborative environment.

Qualifications

• 7+ years of experience in back-end development, focusing on Java and Spring Boot.
• Proven experience with microservices-based architectures.
• Hands-on experience with AWS services and Kubernetes for orchestration.
• Strong experience in building RESTful APIs.
• Familiarity with CI / CD and automated testing frameworks.

Responsibilities

• Lead design and development of backend services for a SaaS B2B platform.
• Build and maintain microservices ensuring scalability and performance.
• Develop and optimize RESTful APIs for frontend applications.
• Ensure integration with third-party systems.
• Identify performance bottlenecks and optimize backend services.
• Advocate for clean code and DevOps best practices.
• Provide technical leadership and mentorship to engineers.

Skills

Java

Spring Boot

Microservices

RESTful APIs

AWS

Kubernetes

SQL

CI / CD

Problem-solving

Communication

Tools

Docker

Postgres

JUnit

Mockito

Flyway

TypeScript

React

Tailwind CSS

Job description

Key responsibilities

• Technical Architecture : lead the design and development of backend services for our SaaS B2B platform, focusing on creating an open architecture that integrates various players in the private equity ecosystem
• Microservices : build and maintain microservices using Java 21 and Spring Boot, ensuring scalability, reliability, and performance
• API Development : develop and optimise RESTful APIs to support our frontend applications built with React and TypeScript
• Platform Integration : ensure seamless integration of our platform with third-party systems used by PE firms, distributors, private banks, and fund administrators
• Performance & Optimization : proactively identify performance bottlenecks, optimize data flow, and ensure backend services operate with maximum efficiency
• Best Practices & Code Quality : advocate for clean code, automated testing, and DevOps best practices, ensuring high-quality software development and deployment processes
• Mentorship & team growth : provide technical leadership and mentorship to engineers, building a culture of excellence, innovation and continuous learning

Qualifications

• 7+ years of experience in back-end development, with a strong focus on Java and Spring Boot
• Proven experience in designing and developing microservices-based architectures
• Hands-on experience with AWS services, including EC2, and a strong understanding of Kubernetes (K8s) for container orchestration is a big plus
• Strong experience in building RESTful APIs, especially OpenAPI-generated interfaces
• Familiarity with CI / CD pipelines and automated testing frameworks
• Proficiency with SQL including migrations (Flyway), ensuring data integrity and optimal performance
• Excellent analytical and problem-solving skills with a focus on delivering scalable solutions
• Strong communication skills with the ability to articulate complex technical concepts to non-technical stakeholders

Technologies

• Back-end : Java 21, Spring Boot, REST, Postgres / Jooq / Flyway, JUnit / TestContainers / Mockito, AWS (EC2, RDS, Cognito, S3, KMS), Containerization (Docker / kubernetes)
• Front-end : TypeScript, React, and Tailwind CSS