Arul kumar Balakrishnan

Worked as a key person in Sainsbury's Groceries Online Application, which is an ecommerce application which allows end users to place their groceries orders online. Sainsbury's is a second largest chain of super markets in the United Kingdom.

Working in a core strategic team within Sainsbury's as a back end developer using java springboot. Also, as an WCS SME guided and mentored the offshore team to run the application smoothly.

• Working closely with different product team and understanding the requirements and converting to user stories and spikes.
• Worked with different teams and understanding the data in their kafka topic/flat files and created Dataflow diagrams.
• Worked on JSON, AVRO, XML and CSV data formats
• Developed Infrastructure as Code with Terraform, set up code repository in Github.
• Worked on user story to read data from Kakfa topic or flat files and persisted into the Dynamo Database.
• Created the REST and GraphQL endpoints to the data held within Dynamo Database.
• Created Lambda to update the Dynamo Streams into postgres database.
• Created Lambda to perform cache invalidation within Redis.
• Created the containerised Integration tests
• Did performance testing for the REST and GraphQL endpoints using Jmeter and analysing metrics data to assess overall project performance.
• Created the Step functions to re-trigger the data within Dynamo Database.
• Did the Proof of concept using Graph database Neptune and Jupiter
• Actively involved in Technical sessions, Sprint refinement and planning.
• Worked closely within team to achieve the team goals and deliveries.
• Created the Github action flows.
• Involved in half yearly, mocking Disaster recovery work.
• Worked on new feature updates to existing software systems to add functionality and delivered successfully.
• Always helping new starters(jump starters) in understanding project requirements and effectively setting them up within the team.
• Conducted the code walk through and technical sessions, enabling team members to grasp key concepts.
• Provided mentorship to offshore team members, helping them understand system architecture and complex business logic.
• Collaborated with production support team, helping them analyse the code base and identify potential fixes, ensuring quick resolution of production issues.
• Utilised git for version control to streamline code quality.
• Adapted and learn different tech stack based on new project requirements.
• Taken care of entire project from design to delivery, maintenance and support.
• Acquired certification in AWS Certified Solutions Architect - Associate level.

Worked as a Systems Engineer in Sainsbury's Groceries online application

• 24x7 supporting Groceries online application
• Worked in development of Sainsbury's Delivery Passes application
• Identified bugs, risks and anomalies, applying action to prevent reoccurrence.
• During Covid-19 times, worked hardly and very closely with business team to run the online application smoothly
• To avoid panic buying did the bulk restriction within support scope.
• Changed and ran the scheduled critical batch jobs in different time for business reasons and fixed the issues on the go.
• Automated many shell scripts to prepare and send the report to business team during Covid-19 times.
• Created automated scripts to add end users into different category of elderly, vulnerable and disability segments to get the benefits.
• Identified and given code fix for long pending problem logs.
• Worked on deploying the new code releases in different Availability zones after every sprint.

Worked as a Key person and Subject Matter Expert in Sainsbury's Groceries Online Application

• Led the offshore team and shared the commerce knowledge to meet the team and project goals
• Monitored the critical batch jobs and provided the solution within SLA
• Created and scheduled multiple batch jobs in control-m
• Analysed and solved the problems related to Change requests
• Performed the root cause analysis for many priority problem log tickets and provided solutions to project teams
• Had analysed and fixed multiple issues within support scope
• By traversing the application logs reproduced many complex issues and provided solution via problem log management
• Had worked on complex data issues and identified the solution and fixed it via automated jobs or manually.
• Had given code fix for bugs reported or identified within the support team.
• Provided support to Contact centre application, Delivery resource system.

Worked as a key person in Sainsbury's Groceries Online Application, which is an ecommerce application which allows the end users to place their groceries orders online

• 24x7 supporting groceries online application
• Analysing and fixing the issues occurred in production environment
• Proactively written many scripts to prevent the issues in production environment before permanent fix
• Written many scripts within support scope which helps customers for smooth buying
• Provided solution to production issues through Incident and problem management
• Worked closely with product team and gained the confidence.
• Received many appreciation emails from clients and stakeholders.

Worked as a core key WCS developer in 1800 Flowers which is a floral and gift retailer distribution Company in Unites States, which also includes other retailers are 1800 Baskets, Fruit Bouquets, Fannie may, Cheryl's, The popcorn Factory, Harry and David and Wolferman's

• Extensively worked and customized Orders, Catalog, promotion, member and marketing subsystems to the business needs
• Also, worked on integrating all these application into the single channel of usage with respect to end user needs
• IBM Certified Web sphere Commerce V7.0 Developer
• Interacted with business team for development, improvements and architecture understanding and converted to user stories
• Created new controller commands, task commands, entity beans and access beans
• Developed Registries, and tag libraries for easy data retrieval
• Designed major requirement and developed the product page for club products category in Harry and David & Wolferman's application
• Implementation of enhancements, fixing issues during stabilisation window
• Had hands on Build and Deployment using Ant script
• Good knowledge on AGILE software development methodology
• Experienced in production support eCommerce Operations
• Experienced in working and coordinating with other teams like System Administration team, Websphere Administration team, DBA Team, Networking team
• Adhered to best practice coding standards.