Staff software Engineer (API, Microservices, Oauth)- Contract

Key Responsibilities: Key skills: Open API, Microservices, Java, Oauth, JWT, Swagger, SQL Technical Delivery & Systems Analysis • Own Corporate Banking channel (infinity program and projects) requirements→ solution design → integration → testing → rollout. • Produce engineering ready specifications: • API specs (REST/JSON), OpenAPI/Swagger definitions • Microservices interface contracts, event schemas, callback payloads • Sequence diagrams, state machines, mapping specs, error models Define end to end orchestration flows for: • Pre-Payment initiation, acceptance, expiry, rejection • Entitlement and Auth Matrix lifecycle events • Template, Past Payment, Bene Master Specify robust pre processing logic: • Customer/account validation • Entitlement and authorisation checks • Funds availability • Limits, thresholds, duplicate suppression • Idempotency, retry and timeout handling API & Microservices Architecture • Define API and microservices designs using existing components • Payment initiation microservices • Validation & entitlement services • Fraud/AML adapters • Core banking and ledger integration patterns Integration & Platform Engineering • Design integration between: • Payment Hub / RFP Orchestrator • Payment gateway • Core banking, ledger, AML, fraud • Use existing microservices blueprints for: • Error propagation and code mapping • Schema validation and transformation • Event lifecycle management • Callback patterns and async updates Quesscorp Singapore Pte. Ltd Reg No- 199801439D Disclaimer: The company is committed to ensuring the privacy and security of your information. By submitting this form, you consent to the collection, processing, and retention of the information you provide. The data collected (which may include your contact details, educational background, work experience and skills) will be used solely for the purpose of evaluating your qualifications for the position you're applying for. Your data will be stored securely and retained for the duration necessary to fulfill our hiring process. If you are not selected for the position, your data will be kept on file for a limited period in case future opportunities arise. You have the right to access, correct, or delete your data at any time by contacting us at Quess Singapore | A Leading Staffing Services Provider in Singapore (quesscorp.sg) This is in partnership with the Employment and Employability Institute Pte Ltd (“e2i”). e2i is the empowering network for workers and employers seeking employment and employability solutions. e2i serves as a bridge between workers and employers, connecting with workers to offer job security through job-matching, career guidance and skills upgrading services, and partnering employers to address their manpower needs through recruitment, training, and job redesign solutions. e2i is a tripartite initiative of the National Trades Union Congress set up to support nation-wide manpower and skills upgrading initiatives. By applying for this role, you consent to Quesscorp Singapore’s PDPA and e2i’s PDPA