Viveak Vadivelkarasan
Motion
London, UK

Work · Selected

Complex problems. Real outcomes.

Three programmes, each stated the way the CV records it: the role I held, the period, what I owned and the outcome the work supported. Client programmes delivered through Deloitte Digital are attributed as such.

  1. Latest project · current role

    Tech Lead, External APIs

    Jul 2025 - Present

    Designing delivery for ~1M events a day.

    Supported outcome
    ~1M events/day through the event-driven delivery service
    Ownership
    I lead a team of 9 engineers across multiple parallel workstreams, working closely with product, delivery and the technical architect, and I designed and built the event-driven webhook delivery service behind every external client integration.
    • AWS EventBridge
    • BullMQ
    • Redis
    • PostgreSQL
    • EKS
    • HMAC
    • Datadog
    Read the case study
  2. Dyson · via Deloitte Digital

    Lead Engineer

    Jun 2018 - May 2020

    Changing the platform behind a 300+ engineer organisation.

    Supported outcome
    EC2-to-Kubernetes migration on AWS for a 300+ engineer organisation
    Ownership
    As Lead Engineer on the Deloitte Digital programme, I led the EC2-to-Kubernetes migration on AWS and built the automated UAT and performance environments around it.
    • AWS
    • Kubernetes
    • EC2
    • AEM
    Read the case study
  3. LEGO · via Deloitte Digital

    Lead Engineer

    Jun 2021 - Dec 2022

    A platform migration. Zero customer-visible disruption.

    Supported outcome
    Oracle Crowdtwist to Salesforce Marketing Cloud with zero customer-visible disruption
    Ownership
    As Lead Engineer on the Deloitte Digital programme, I led a team of four engineers migrating LEGO's communication channels from Oracle Crowdtwist to Salesforce Marketing Cloud, and built the AWS integrations underpinning the new marketing pipeline.
    • Salesforce Marketing Cloud
    • Oracle Crowdtwist
    • AWS
    Read the case study

Separate engagement

Full-Stack Developer, LEGO.com · via Deloitte Digital

Jun 2020 - Jun 2021

~30% fewer customer-service contacts.

Designed and shipped the AWS-driven automated self-returns journey on LEGO.com, cutting customer-service contact volume by ~30%.

This result belongs to the LEGO.com engagement, not to the Salesforce Marketing Cloud migration above. It has no case study of its own; the experience page records it in full.

See the engagement

Lab

Break the system. See how it recovers.

The delivery patterns behind the external API platform case study, retries, circuit breakers, rate limits and a dead-letter queue, as a working model you can push around. Interactive educational simulation. Synthetic data. Not connected to employer systems.

Open the webhook-delivery lab