Client: Ministry of Public and Business Service Delivery and Procurement (Government Services Integration Cluster)

Job Title: Software Developer - Full Stack - Senior

Job Location: Onsite | 222 Jarvis St., Toronto

Contract Duration: 252.00 Days (Potential Extension)

Description:

Must Have

- Please focus on the bolded technologies in the Responsibilities and Skills & Evaluation Criteria.

Responsibilities:

- Design, build, and maintain full‑stack components of the digital credentials platform using up-to-date JavaScript frameworks (React, Vue, Angular), Python, Java, HTML5, CSS3 and similar stacks.
- Develop and extend open-source Open Wallet Foundation ACA-PY , credential exchange protocols, DID resolution services, and secure messaging workflows.
- Implement credential lifecycle features—including issuance, presentation, revocation, and IETF Status List support—aligned with W3C Verifiable Credentials and decentralized identity standards.
- Build secure APIs and asynchronous services to support verification flows, trust framework compliance, and interoperability across issuers, holders, verifiers, and external systems.
- Apply strong security practices, implementing cryptographic operations, secure key management, and hardware‑backed storage patterns.
- Ensure back‑end integrations follow best practices for authentication, authorization, encryption, and secure data exchange.
- Support front‑end user interfaces and admin dashboards that interact with credential services, ensuring usability, performance, and accessibility.
- Develop automated tests (unit, integration, API‑level), participate in code reviews, and uphold high engineering standards across the stack.
- Collaborate closely with architects, DevOps, security specialists, and cross‑ministry stakeholders to ensure end‑to‑end functional integrity.
- Document system designs, workflows, schema definitions, and operating procedures to support maintainability and knowledge sharing.
- Participate in Agile ceremonies, support milestone planning, and assist in troubleshooting distributed digital credential environments.

Skills & Evaluation Criteria:



Digital Credentials Platform Development - 40%

- In-depth development experience with JWT/JWS , PKI (X.509) , OAUTH2, and SHA/SHA2.
- Design, develop, and maintain digital credentials platform and services that support the full digital credentials lifecycle (issuance, holding, presentation, revocation, and status checks), using Python as a primary development language.
- Developing and extending Open Wallet Foundation ACA-PY agents, credential exchange protocols, DID resolution components, and secure messaging workflows.
- Build and maintain credential status infrastructures, including IETF Status List implementations for revocation, suspension, and validity checking.
- Develop RESTful service APIs and asynchronous service components supporting verifiable credential exchange, credential verification, trust framework compliance, and interoperability with external systems.
- Implement secure interaction patterns between credential issuers, verifiers, and holders, ensuring compliance with decentralized identity standards, trust registries, and governance frameworks.
- Ensure compliance with global digital identity standards and/or specifications such as W3C Verifiable Credentials , IETF, PCTF , NIST , and eIDAS .
- In-depth understanding of security and protocols such as OIDC , OIDF OpenID4VC/OpenID4VP, W3C DC-API, OAuth 2, JWT/JWS(JOSE) , TLS , PKI , CBOR/COSE , ECDSA P-256, Ed25519, SHA/SHA2 , and RSA.
- Knowledge of W3C verifiable credential data model, ISO/IEC 18013-X, ISO/IEC 23220-X (mDOC) and decentralized identifiers (DIDs) .
- Contribute to standards adoption by evaluating new specifications (e.g., DIF, ToIP, IETF) and translating them into working production components.

Full‑Stack Development & Integration – 40%

- Build user‑facing components, dashboards,



or admin consoles that interface with digital credential services using modern JavaScript frameworks (React, Vue, Node.js) , Python, Java, HTML5, CSS3 and similar stacks.
- Integrate backend systems into broader enterprise and cross‑ministry ecosystems using REST APIs, event‑driven services, and secure messaging systems.
- Contribute to containerized deployments using Docker and orchestrated environments such as Kubernetes.
- Develop automated unit, integration, and API‑level tests to ensure robustness of digital credential workflows.
- Participate in code reviews, architectural discussions, and quality engineering practices to ensure reliable and maintainable production systems.
- Ensure robust back‑end interaction patterns including authentication, authorization, encryption, and secure data exchange.

Security, Cryptography & Trust Infrastructure – 10%

- Implement cryptographic operations for signing, encrypting, deriving proofs, and verifying credentials using libraries and standards relevant to decentralized identity.
- Apply modern secure coding practices in areas such as key management, hardware‑backed storage, DID document handling, secure channel establishment, and credential integrity protection.
- Ensure systems follow enterprise security guidelines and trust framework requirements (e.g., PCTF, IETF, NIST, eIDAS), performing regular security updates and dependency patching.

Collaboration, Documentation & Agile Delivery – 10%

- Work closely with architects, developers, DevOps, automation engineers and security specialists to ensure end‑to‑end functional integrity across digital wallet, credentials issuer and credential verifier.
- Document system designs, credential workflows, schemas, data models, and operational procedures to support maintainability and knowledge sharing.
- Participate in Agile ceremonies (sprint planning, refinement, retrospectives) and contribute to milestone planning for digital identity features.
- Support troubleshooting and root‑cause analysis across distributed digital credential environments.

📌 Senior Digital Identity / Credentials Developer – Full Stack (Toronto)
🏢 GlobalVariable
📍 Toronto