CDT – 1 Software Developer API (Snr) – 250 + 130 Days

United States Digital Space LLC; Toronto; On-site; CAD 90,000 - 130,000; Full time

Job summary

United States Digital Space LLC is seeking a Senior API Software Developer to design, build, and document robust REST APIs. You will develop microservices in Java/Spring Boot, leveraging Azure services and Spring Integration for scalable integration patterns.

The role requires strong SQL expertise, secure authentication (OAuth2/JWT/SAML), and hands-on experience with containers (Docker/Kubernetes). Onsite in Toronto, 7.25-hour days, M‑F, with potential on-call coverage.

Qualifications

• Extensive experience designing, building, and testing REST APIs with Spring Integration.
• In-depth knowledge of microservice architecture on Azure, with messaging and event-driven patterns.
• Strong SQL skills with SQL Server or Oracle.
• Knowledge of OAuth2, JWT, SAML authentication/authorization technologies.
• Ability to transform data between JSON, XML, and CSV in Spring Integration context.

Responsibilities

• Design, build, and test RESTful APIs and endpoints with clear request/response models and error handling.
• Develop modular microservices, with Docker/Kubernetes deployment and inter-service communication.
• Implement monitoring/logging (Prometheus, Grafana, ELK) for operational visibility.
• Produce documentation for designs, deployment instructions, and operational guides.
• Mentor junior developers and participate in code reviews and sprint planning.

Skills

REST API design

Java / Spring Boot

Microservices

Azure services

SQL / RDBMS

OAuth2 / JWT / SAML

Spring Integration

Docker / Kubernetes

Security best practices

Unit testing (JUnit/Mockito)

Tools

Docker

Kubernetes

Spring Integration

Azure Service Bus

Job description

DescriptionA Note on Assignment Type:

This position is currently listed as “Onsite”, working 7.25 hours per calendar day, sometime between 8:00 AM and 5:00 PM (excluding breaks) Monday to Friday inclusive, unless otherwise identified.

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.

Assignment Deliverables

• 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.
• Support – Assist with troubleshooting production issues (24/7) and support day-to-day operations

Experience Requirements

A Note on the VOR Master Service Agreement:

The VOR Master Service Agreement expires on April 5, 2027, and includes a six (6)-month survival clause, allowing the Statement of Work (SOW) to continue, if operationally required, until October 5, 2027. Extension(s) are only allowed using unused days and/or funds remaining on the contract. No additional funds will be added beyond the maximum contract value and any extension options included in the original SOW. JTS may exercise its option(s) to extend the SOW beyond April 5, 2027, in accordance with the survival clause.

The start date is subject to change based on security clearances and contract signing timelines.

Experience and Skillset Requirements

Mandatory Requirements

• Extensive experience in designing, building, and consuming REST APIs, including API documentation and testing, as well as in-depth knowledge of integration patterns and best practices, with 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, including hands‑on experience with messaging queuing, event‑driven architecture, and asynchronous communication/multi‑threading.
• Strong skills in SQL and experience working with relational databases such as SQL Server or Oracle.
• Knowledge of integration with OAuth2, JWT, SAML, and related authentication/authorization technologies.
• Knowledge of data transformation techniques, such as mapping and normalization, with experience applying them in a Spring Integration context.
• Ability to transform data between different formats, including JSON, XML, and CSV.

Nice-to-Have Requirements

• Knowledge and experience in Criminal Justice Business and System

Desired Skills and Experience

• Strong proficiency in object-oriented programming and functional programming with modern Java features.
• Strong expertise in Java and the Java development ecosystem, including experience with Spring Boot.
• In-depth knowledge of microservice architecture and experience building scalable, highly available systems.
• Expertise in designing, building, and consuming REST APIs; knowledge of HTTP methods, status codes, and REST best practices
• In-depth knowledge of integration patterns and best practices, including experience designing and building integration solutions using Spring Integration
• Experience with enterprise integration technologies, such as JMS, AMQP, or REST, and an understanding of how to use them in a Spring Integration context.
• Strong knowledge of XML and experience working with XML-based integration solutions, such as XSLT and XPath.
• Knowledge of data transformation techniques, such as mapping and normalization, and experience using them in a Spring Integration context.
• Experience with message-oriented middleware and enterprise service buses, such as Azure Service Bus
• Experience on Event Driven architecture, experience on Azure Event Hub, etc.
• Strong skills in SQL and experience working with relational databases, such as SQL Server, or Oracle.
• Understanding of security best practices and experience implementing authentication, authorization, and encryption.
• Strong experience with writing automated tests, including unit, API test, and a deep understanding of the testing process.
• Familiarity with Kubernetes, Helm, or other container orchestration tools.
• Familiarity with Agile software development methodologies, such as Scrum or Kanban, and experience participating in sprint planning and retrospectives.
• Excellent communication skills, both written and verbal, and the ability to work effectively with both technical and non-technical stakeholders.
• A passion for staying up-to‑date with the latest industry trends and technologies, and a desire to continuously learn and improve your skills.
• Strong problem‑solving and debugging skills, and experience diagnosing and resolving complex issues.
• A track record of delivering high-quality, robust, and scalable solutions in a fast-paced, deadline-driven environment.
• Strong analytical and troubleshooting abilities for complex systems.
• Clear verbal and written communication for technical and non-technical stakeholders..
• Capable of mentoring junior developers and contributing to architectural decisions.
• Ability to prioritize tasks, manage deadlines, and handle multiple responsibilities.

Resumes Evaluation/Criteria:

Criteria 1: Technical Design – 30 Points

• Strong expertise in Java and the Java development ecosystem, including experience with Spring Boot.
• In-depth knowledge of microservice, Event Driven architecture and experience building scalable, highly available systems.
• Extensive experience with REST API design and development, including experience with API documentation and testing.
• Practical knowledge in applying various design patterns and standards to the technical design and development.
• Strong skills in SQL and experience working with relational databases, such as SQL Server.

Criteria 2: Integration – 30 Points

• In-depth knowledge of integration patterns and best practices, including experience designing and building integration solutions using Spring Integration
• Hands-On experience in messaging queuing (Azure Service Bus) and event driven architecture.

Criteria 3: Technical Framework and Middleware – 25 Points

• In-depth knowledge of microservice architecture and experience building scalable, highly available systems using various Azure Services.
• Must have prior experience in working with containerized environments such as Azure, OpenShift, Docker, Kubernetes, Microservices, etc.
• Experience with message-oriented middleware and enterprise service buses, such as Azure Service Bus.
• Experience on Event Driven architecture.

Criteria 4: Security – 10 Points

• Experience with Security and Web Services Security standards and frameworks. Must have extensive working experience in OAuth, OpenID, SAML 2.0, etc.
• Understanding of security best practices and experience implementing authentication, authorization, and encryption.

Criteria 5: Public Sector Experience – 5 Points

• Previous experience working in Government or Public Sector organization.

Knowledge Transfer

What needs to be KT

• Code \& Documentations of all type assigned for this role.

To whom

• Project Manager / Team members

When

• 1:1 meetings / team meetings / documentation on SharePoint site, throughout the duration of the project life cycle etc.

Supplier CommentsClosing Date/Time: 2026-07-29, 3:00 p.m.

Max submission: 1 (one)

5 days onsite

Must Have:

• Extensive experience in designing, building, and consuming REST APIs, including API documentation and testing, as well as in-depth knowledge of integration patterns and best practices, with 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, including hands‑on experience with messaging queuing, event‑driven architecture, and asynchronous communication/multi‑threading.
• Strong skills in SQL and experience working with relational databases such as SQL Server or Oracle.
• Knowledge of integration with OAuth2, JWT, SAML and related authentication/authorization technologies.