Senior Software Developer API

Source Code; Toronto; On-site; CAD 90,000 - 130,000; Full time

Job summary

A software development company in Toronto is seeking a Senior Software Developer with expertise in API development. The ideal candidate will have over 8 years of experience in designing and building RESTful APIs. You will be responsible for ensuring high performance under load and integrating secure authentication methods. The position involves close collaboration with junior developers and requires skills in Java, Spring Boot, and relational databases such as SQL Server or Oracle.

Qualifications

• 8+ years experience as a Sr. API Software Developer.
• Extensive experience in designing REST APIs and their documentation.
• In-depth knowledge of integration patterns, specifically with Spring.

Responsibilities

• Create and use APIs based on functional specifications.
• Develop detailed design and specification documents for RESTful APIs.
• Ensure secure API calls and optimize APIs for performance.

Skills

Designing REST APIs

Building and consuming APIs

Integration patterns

Microservice architecture

SQL skills

Tools

Java

Spring Boot

Kubernetes

SQL Server

Oracle

Job description

RQ09964/RQ09965 - Sr. Software Developer - API

About the job RQ09964/RQ09965 - Sr. Software Developer - API

RQ09964/RQ09965 - Sr. Software Developer - API

Contract 1 year

2 Openings

Security Level: CRJMC

Scope

• A senior API Software Developer with 8+ years of experience will be responsible for creating and using APIs to translate functional specifications into working and tested applications. This includes developing detailed programming specifications, user interface designs, prototypes, writing and/or generating code, compiling data driven programs, conducting unit tests and debugging code.
• Detailed design and specification documents for RESTful APIs, including endpoints, request/response models, authentication, and error handling.
• Clean, scalable, and secure REST APIs built using Java and Spring Boot, adhering to best practices and company standards.
• Modular and decoupled microservices, designed and deployed independently, with clear inter-service communication protocols.
• Using APIs to develop application based on the business requirement to transform and route data.
• Comprehensive test coverage using tools like JUnit, Mockito, or Test Containers to ensure code reliability and prevent regressions.
• Efficient relational database schemas designed and implemented to support API data storage and retrieval.
• Profiled and optimized APIs for response time, memory usage, and throughput, ensuring high performance under load.
• Secure API calls with proper authentication (e.g., OAuth2, JWT), authorization, input validation, and protection against common vulnerabilities (OWASP).
• Dockized applications with configuration files, docker-compose scripts, and Kubernetes manifests (if applicable) for smooth deployment.
• Integrated monitoring (e.g., Prometheus, Grafana) and logging (e.g., ELK stack, Logstash, or Splunk) for operational visibility.
• Produce clear documentation for developed systems such as design, deployment instructions, and operational guides.
• Regular code reviews, feedback sessions, and mentorship to junior developers, ensuring code quality and knowledge sharing.
• Weekly or sprint-based status updates on development progress, blockers, and delivered functionalities.
• Timely resolution of production issues, regression fixes, and performance improvements based on user feedback and testing.
• Available for any on-call on weekend for production issues.

Must-haves:

8+ years of experience as a Sr. API Software Developer

• Extensive experience in designing, building, and consuming REST APIs, including experience with API documentation and testing.
• In-depth knowledge of integration patterns and best practices, including experience designing and building integration solutions using Spring Integration
• In-depth knowledge of microservice architecture and experience building scalable, highly available systems using various Azure Services.
• Hands-On experience in messaging queuing and event-driven architecture.
• Strong skills in SQL and experience working with relational databases, such as SQL Server, or Oracle.
• Knowledge on Integration with Oauth2, JWT, SAML, etc.
• Knowledge of data transformation techniques, such as mapping and normalization, and experience using them in a Spring Integration context.

Nice-to-have:

Knowledge and experience in Criminal Justice Business and System

Experience with asynchronous communication, multi-threading.

Ability to transform data between different formats (JSON, XML, CSV).