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Geraint Guan

I build software end-to-end from 0 → 1 and scale them beyond minimum viable products.

Experience

ClearSky Logic Logo

Tech Lead

Mar 2025 — Present (3 mths)
ClearSky Logic
Azure
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C#
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.NET
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MSSQL
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Azure DevOps
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Azure DevOps Pipelines
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I joined in the middle of discovery for a new client project and after successful completion I am now leading a team of 3 engineers in the implementation phase.

Notable Achievements
  • Successfully completed discovery phase for a new client project.
  • Created a technical architecture plan in a high complexity and security environment that was well received and approved by the client.
  • Leading an implementation team of 3 engineers with a mixture of technical stakeholder management with the client, supporting the team technically, and some hands-on individual contributions.
Appointedd Logo

Head of Developer Operations

Oct 2023 — Mar 2025 (1 yr, 5 mths)
Appointedd
AWS
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TypeScript
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React
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Node.js
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MongoDB
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React Native
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GraphQL
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tRPC
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Fastify
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Expo
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JavaScript
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AngularJS
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PHP
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Docker
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GitHub
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GitHub Actions
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I started to take on more leadership responsibilities by heading up a department focused on maintaining and improving Appointedd's infrastructure, internal tooling, and customer issue triage processes. I continued to support the wider engineering team with building key product features.

Notable Achievements
  • Worked with leadership to spearhead building a developer operations department and reorganise team structure.
  • Designed a well received high-level modern architecture plan with clear next steps to work towards to.
  • Advised leadership on technical strategy, issues, and culture.
Appointedd Logo

Lead Software Engineer

Apr 2020 — Oct 2023 (3 yrs, 6 mths)
Appointedd
AWS
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TypeScript
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React
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Node.js
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MongoDB
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React Native
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GraphQL
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tRPC
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Fastify
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JavaScript
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AngularJS
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PHP
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Docker
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GitHub
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GItHub Actions
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I started to take on more leadership responsibilities along with my individual contribution work, balancing the two responsibilities. I led a product development team of 2 - 3 engineers, scoping and delivering key product features and improvements from conception to release.

Notable Achievements
  • Led, mentored, and line managed a team of 2 - 3 product engineers to successfully deliver numerous key product features and improvements.
  • Successfully worked end-to-end solo to deliver a key client requested mobile app integration.
  • Supported client success team with problem solving and fixing critical client issues.
Appointedd Logo

Senior Software Engineer

Jan 2019 — Apr 2020 (1 yr, 3 mths)
Appointedd
AWS
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TypeScript
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React
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Node.js
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MongoDB
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React Native
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GraphQL
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Fastify
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JavaScript
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AngularJS
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PHP
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Docker
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GitHub
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GItHub Actions
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I continued to develop my technical and product skills as I progressed in seniority. Continued to do solo feature development, supporting other team members in the engineering team, and started to contribute to infrastructure maintenance and development.

Notable Achievements
  • Migrated core bookings engine to serverless reducing infrastructure costs by 20% and improving stability.
  • Spearheaded introduction of new technologies and processes improving developer productivity and application performance.
  • Supported commercial and client success teams on calls to help close and retain key clients.
Appointedd Logo

Software Engineer

Jan 2017 — Jan 2019 (2 yrs)
Appointedd
AWS
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JavaScript
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AngularJS
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Node.js
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MongoDB
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PHP
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Docker
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CodeShip
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My first professional role after graduating. I primarily did solo feature development and bug fixing, as well as customer support rotations.

Notable Achievements
  • Built the first version of our public-facing RESTful API.
  • Completely rebuilt our core availability engine and launched it with no outages.
  • Created technical challenge that we used to hire further engineers to the team.