Jayshree Deka

Client: Nationwide Building Society (NBS)
Domain - Finance Sector

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GraphQL API Development – Subgraph & Supergraph Integration :

01/2024 - Present

>Platforms: Graphql (subgraph & supergraph), AWS cloud, Redis cache, Kubernetes
>Tools: Visual Studio, Harness, Postman, Dynatrace, GitHub

• Working on GraphQL API development, creating new subgraphs from scratch using existing project templates and enabling them through supergraph modifications.
• Designed and implemented token-based authentication with JWKS validation and certificate-based tokens (private signing key, public key PEM extraction, Vault integration) to ensure secure API consumption.
• Developed scope and claims validation for party JWTs and system tokens, strengthening authentication and authorization mechanisms.
• Integrated Redis Cache within subgraphs to store, retrieve, and update data efficiently, improving performance and reliability.
• Authored and presented interface documents, functional specifications, and LLD designs, ensuring clarity and alignment with business requirements.
• Supported testers and QA teams by writing and splitting user stories, defining acceptance criteria, and validating implementations through Postman.
• Conducted unit and component test coverage, ensuring service reliability and smooth delivery.
• Analyzed backend BI service requests and responses, implemented business logic, and created GraphQL request/response structures tailored to client application needs.
• Collaborated with multiple teams to integrate BI services into subgraphs, enabling frontend applications to consume APIs effectively.
• Configured network policies to allow BI IP connectivity from cloud environments and created pass-through services for on-prem to cloud integration.
• Executed deployments across dev/test/prod environments using AWS, Harness, and Helm; authored runbooks for production support and troubleshooting.
• Set up Dynatrace alerts to monitor subgraph health and proactively detect issues in service consumption.

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Digital Authentication – REST API Development

07/2023 - 01/2024

>Platforms: GraphQl, RestApi, Aws cloud, Kubernetes
>Tools: Visual studio, Harness, Postman, vault, Redis, Dynatrace,Github

• Currently working on GraphQL API development, designing and implementing secure, scalable APIs for digital banking, and enterprise systems.
• Hands-on expertise in REST API design and development from scratch, including AWS deployment with infrastructure setup using Harness, and Helm for container image creation.
• Authored and presented Low-Level Design (LLD) documents and interface specifications to ensure clarity, alignment, and successful implementation.
• Implemented token-based authentication with JWKS validation, enabling secure external API consumption by validating tokens, issuers, and scopes.
• Integrated Redis Cache to store, retrieve, and update data efficiently, and leveraged Vault to securely fetch tokens for authentication.
• Supported testers and business analysts by writing and splitting user stories, defining acceptance criteria, and assisting with testing through Postman.
• Collaborated across teams to ensure smooth deployments, proactively resolved blockers, and strengthened delivery quality through knowledge sharing and hands-on support.

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Digital Banking Application – Mobile & Web Enhancements:

02/2022 - 10/2023

>Platforms: .net framework, Sencha,IIS
>Tools: Visual Studio, TFS, Jenkins , SQL Server

• Contributed to development of NationWide Banking App (NBS) using Sencha and C#.
• Implemented enhancements to existing screens and developed new features based on business requirements.
• Designed secure user authentication mechanisms to improve safety in payment transfers.
• Ensured compliance with industry security standards through rigorous testing and implementation.
• Managed end-to-end lifecycle of software development projects, from concept to deployment.
• Worked using Agile methodology to develop design and direction for new applications.
• Managed application development projects from start to completion, including planning, design and development.
• Coordinated quality testing with assurance team and partnered on resolving defects.

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Internet Bank – Transaction Workflow Development:

11/2021 - 02/2022

>Platforms: .Net framework, ASP.NET , WCF, IIS
>Tools: Visual Studio, MS SQL Server, TFS, Jenkins, Github

• Worked on the NationWide Internet Banking (NBS) web application built using C#, ASP.NET, and WCF Services.
• Developed and enhanced the payment transaction feature, implementing business rules and criteria to ensure accuracy and reliability.
• Built multiple validation checks and designed alert popups to guide users during unsuccessful transactions, improving transparency and user experience.
• Implemented robust exception handling and logging mechanisms to capture failures, enabling faster troubleshooting and system stability.
• Collaborated with business analysts and QA teams to deliver secure, efficient, and user-friendly transaction workflow>Platforms:Graphql (subgraph & supergraph), AWS cloud, Redis cache, Kubernetes
  >Tools: VS, Harness, Postman, Dynatrace, GitHub,

Client :HealthFirst

Domain : Health Sector

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HealthFirst - Real Time Eligibility Application

04/2019 - 07/2021

>Platforms: .Net framework, DB2 and SQL server, ado.net
>Tools: Visual studio, TFS, Jenkins

• Developed and maintained HealthFirst's Real Time Eligibility product, ensuring high performance.
• Ensure Generated and returned EDI 271 and 277 responses with precise eligibility and claims information including benefits, coverages and copay information.
• Ensured HIPAA compliance for secure data exchanges throughout the project.
• Executed yearly Benefit Package updates to MHS and SQL databases.
• Gathered requirements from vendors and stakeholders.
• Performed bug fixes and clarifications for existing functionality.
• Designed and implemented enhancements by adding new features.
• Managed incidents and provided timely resolutions.

HealthFirst EMR (Electronic Medical Records)

02/2019 - 12/2020

>Platforms: .net framework, SQL SErver, Ado.net, asp.net,jquery, Entity Framework
>Tools: Visual Studio, TFS, Jenkins, SSRS

• Assessed member eligibility for insurance enrollment using HealthFirst EMR application.
• Maintained comprehensive records within EMR to ensure adherence to guidelines.
• Identified eligible members based on referrals processed by the application.
• Scheduled ES and RN appointments for member evaluations and screenings by using application and support needs to be provided incase of any error/incident
• Gathered requirements for new features and change requests to enhance system functionality.
• Facilitated client access upon request to improve collaboration and communication.
• Conducted sprint planning meetings to prioritize development of features and bug fixes.

HealthFirst KIDS :

02/2021-07/2021

>Platforms: .net framework, sql server, ado.net, entity framework, asp.net , jquery
>Tools: Visual Studio, Jenkins, TFS, SSRS

• KIDS Application is a Product of HealthFirst , which captures the change/add/disenrollment etc for a member from 834 and MHS database and sent it over New York state NYOH.
• Developed enhancements to KIDS application to improve performance and efficiency.
• Executed testing for annual updates in database, ensuring accuracy.
• Documented changes implemented in application for future reference.
• Coordinated with onsite teams for effective communication and project alignment.