Calum Jones

Lead Product Engineer @Treecard

GB

Enhanced and maintained the existing Go backend by developing new APIs, automating database migrations, and rebuilding the infrastructure as code to support ephemeral deployments. Key features included an e-commerce marketplace API, a subscriptions API, and a loyalty points system.• Designed and built a greenfield backend in Go for “Wildhero”, an eco friendly email client, including OAuth authentication, a unified API for emails and contacts, a Gmail-style query lexer and parser, and a syncing and caching system using Redis, PostgreSQL and S3.• Designed and implemented a platform with a strong focus on security, incorporating JWT authentication, encrypted email storage, and automated SAST scanning in the CI/CD pipeline to ensure compliance with CASA Tier 2 security standards.• Built an analytics platform that enriched incoming data and integrated with AWS EventBridge. Designed Redshift schemas, EventBridge rules, and dashboards for tracking user retention and feature adoption.• Optimised performance and cost by architecting efficient storage and indexing solutions for handling millions of daily email operations. Reduced cloud costs by 30% through infrastructure optimisations and cost analysis.• Managed cloud infrastructure using Terraform, automating deployments and resource provisioning across AWS services. Set up monitoring and alerting with AWS CloudWatch and pganalyze to track database performance and application health.• Led backend strategy by defining and executing the roadmap while collaborating with the app, product, and marketing teams to ensure alignment with business goals and provided technical guidance for the product roadmap.• Recruited, built, and managed the backend team (permanent and contractor roles), guiding technical development through coaching, one-on-one sessions, quarterly growth meetings, and pair programming.

University of Staffordshire

Bachelors of Science, Computer Software Engineering

University of Staffordshire

Higher National Diploma, Computer Software Engineering