Designed and developed secure, scalable RESTful APIs for enterprise applications following indust...

Designed and developed secure, scalable RESTful APIs for enterprise applications following indust...Designed and developed secure, scalable RESTful APIs for enterprise applications following indust...

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Snehalatha Reddy Abbavaram

• Aug 1

Designed and developed secure, scalable RESTful APIs for enterprise applications following industry best practices for authentication, authorization, validation, and error handling.

Focused on building reliable backend services capable of handling high-volume requests while maintaining performance and security.

Key Contributions

Designed RESTful APIs.

Implemented JWT Authentication.

Built Role-Based Access Control (RBAC).

Added input validation and centralized error handling.

Optimized API performance.

Conducted API testing and documentation.

Technologies

Node.js • Express.js • JavaScript • JWT • RBAC • PostgreSQL • REST APIs • Postman

Backend Development PostgreSQL Postman Visual Studio Code

Mohtashim Khan

• Sep 27

ESG reporting is a workflow problem as much as a data problem: teams need applicability rules, evidence, consolidation, review, and approvals before a report is ready.

For OriginSustain, I built NestJS/TypeScript backend services, PostgreSQL and Redis/BullMQ processing, and AWS/Docker delivery with CI/CD. OpenAI API and RAG support part of the reporting flow. The screens here are from the product’s illustrative command center; the numbers are demo values, not client outcomes.

The full backend case study: https://contra.com/p/WvNXbmQR-origin-sustain-or-multi-tenant-esg-reporting-backend

Completed work

Backend Development AI Development esgreporting Workflow DevOps AWS PostgreSQL

Anthony Mbeka

• Sep 27

Fintech API converting local currency (M-Pesa, bank, cards) into stablecoins and digital assets on Hedera. I build backend services, dashboards, and payment infrastructure for wallets, fintechs, and institutions moving real money on-chain.

Completed work