Building integrations between OEMs and SmartShift on the OEM team, enabling intelligent energy management for connected devices.
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Stephen Geller
Full-Stack Software Engineer
Currently contracting Full-stack engineer at Amber Electric. Based in Melbourne.
Key Achievements
Identity verification at scale Block
Developer tooling org-wide Guardian
E-commerce + content delivery Redbubble
Observability & SLO frameworks Multiple
From Psychology grad to scaling identity systems for millions at Block. 7+ years shipping products across backend, infrastructure, and frontend. Human-centered thinking meets technical depth.
0 Years experience
0 Companies
0 Engineers mentored
Experience
Led backend development for customer identity verification and support automation, serving millions of Cash App users globally.
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- Verified millions of customer identities — Built Tap to Confirm system with in-app confirmation flows and multi-factor authentication
- Drove org-wide SLO adoption — Created deployment drift monitors adopted across multiple teams, improving system reliability
- Accelerated advocate workflows — Developed tools for PII verification, case management, and customer search
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- Architected PIN-based verification, biometric authentication, and fallback mechanisms
- Migrated customer data systems to CAPS, eliminating legacy dependencies
- Mentored engineers through code reviews, pair programming, and technical guidance
- Led incident response and post-mortem processes, improving system resilience
Frontend engineer on Shop Experience team, delivering e-commerce features and content infrastructure improvements.
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- Enhanced e-commerce storefront — Built new landing page components driving improved user experience
- Unified content delivery — Integrated frontend through BFF to Contentful CMS
- Modernised tech stack — Upgraded Node versions and libraries across applications
Focused on developer experience and observability improvements across the Guardian's digital department.
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- Centralised observability org-wide — Built metrics platform using Grafana, Elasticsearch and CloudWatch
- Simplified AWS infrastructure — Created custom Guardian CDK library adopted across teams
- Reduced production incidents — Built Cypress integration test service monitoring key user journeys
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- Created chatbots integrating PagerDuty and GitHub events with Google Chat
- Established mentorship program between the Guardian and Coding Black Females
Managed Kubernetes infrastructure and monitoring systems using Prometheus and Alertmanager.
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Shared Infrastructure team member following XP and Agile practices for platform reliability.
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- Maintained platform reliability — Managed shared infrastructure systems across the organisation
- Reduced manual toil — Created tested, automated scripts for operations
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- Led code dojos and workshops to upskill engineering teams
Skills & Technologies
Languages
Frontend
Backend
Infrastructure & DevOps
Observability
Practices
Education
Makers Academy
Software Development Bootcamp | 2017
Intensive 12-week bootcamp focused on TDD, pair programming, and Agile methodologies.
University of Sheffield
BSc Psychology (First Class Honours) | 2014 - 2017
Get in Touch
I'm always open to discussing new opportunities, interesting projects, or just having a chat about technology.