Java API Developer

Dns Info Ltd

Charing Cross, United Kingdom

2 days ago

Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Working hours

Regular working hours

Languages

English

Experience level

Senior

Job location

Charing Cross, United Kingdom

Tech stack

Java

API

Amazon Web Services (AWS)

Applications Architecture

Azure

Cloud Computing

Code Review

Relational Databases

DevOps

Memory Management

Hibernate

Java Persistence API

Java Virtual Machine (JVM)

Spring

JUnit

PostgreSQL

Message Broker

MySQL

OAuth

Performance Tuning

RabbitMQ

Mockito

Swagger

JSON Web Token

RSA (Cryptosystem)

Openapi

Spring-boot

Containerization

Integration Tests

Kubernetes

Kafka

Reactive Programming

Api Gateway

Software Coding

REST

Docker

Microservices

Job description

We are seeking a skilled Java API Developer with strong experience in JVM-based Back End systems and secure authentication mechanisms using OAuth 2.0 and JWT. The ideal candidate will design, develop, and maintain high-performance RESTful APIs and ensure secure, scalable, and reliable application architecture., * Design, develop, and maintain RESTful APIs using Java and JVM-based frameworks.

Build microservices using Spring Boot or similar JVM frameworks.
Implement authentication and authorization using OAuth 2.0 and JSON Web Token.
Work with JVM performance tuning, garbage collection, and memory management.
Develop secure API integrations with third-party services.
Implement API security best practices (token validation, encryption, secure headers).
Collaborate with Front End, DevOps, and product teams.
Write unit and integration tests using frameworks like JUnit and Mockito.
Participate in code reviews and ensure coding standards are maintained.
Deploy applications in cloud environments (AWS/Azure/GCP).

Requirements

5+ years of experience in Java Back End development.
Strong understanding of JVM internals (memory model, GC, thread management).
Hands-on experience with Spring Framework ecosystem.
Experience implementing OAuth 2.0 flows (Authorization Code, Client Credentials, etc.).
Strong knowledge of JSON Web Token structure, signing (HMAC/RSA), and validation.
Experience with RESTful API design principles.
Knowledge of relational databases (MySQL/PostgreSQL) and ORM tools (Hibernate/JPA).
Familiarity with CI/CD pipelines and containerization (Docker, Kubernetes).
Understanding of API gateways and security best practices.

Preferred Qualifications