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Geraint Guan ๐Ÿง‘โ€๐Ÿ’ป

Mission driven 0 โ†’ 1 product builder with 8+ years experience building and scaling products in startup, scaleup, and agency environments across front-end, back-end, and infrastructure.

I'm always happy to chat about building products, technology, and startups! Drop me a line on any of the platforms below if you'd like to connect.

Tech Stack

Technologies that I โค๏ธ to build with.

Astro
Astro Logo
AWS
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Development Containers
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Digital Ocean
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Docker
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DynamoDB
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Expo
Expo Logo
Fastify
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GitHub Actions
GitHub Logo
GitHub
GitHub Logo
MongoDB
MongoDB Logo
Node.js
Node.js Logo
PostgreSQL
PostgreSQL Logo
React Native
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React
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Redis
Redis Logo
tRPC
tRPC Logo
TypeScript
Typescript Logo
Vite
Vite Logo
Vitest
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VS Code
VS Code Logo

Experience

Professional roles that I've held. ๐Ÿง‘โ€๐Ÿ’ผ

ClearSky Logic Logo
Tech Lead
Mar 2025 — Present (5 mths)
ClearSky Logic
Azure
Azure Logo
C#
C# Logo
.NET
.NET Logo
MSSQL
MSSQL Logo
Azure DevOps
Azure DevOps Logo
Azure DevOps Pipelines
Azure DevOps Logo

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 HealthTech client project with complex operating requirements.
  • 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
AWS Logo
TypeScript
Typescript Logo
React
React Logo
Node.js
Node.js Logo
MongoDB
MongoDB Logo
React Native
React Logo
GraphQL
GraphQL Logo
tRPC
tRPC Logo
Fastify
Fastify Logo
Expo
Expo Logo
JavaScript
JavaScript Logo
AngularJS
AngularJS Logo
PHP
PHP Logo
Docker
Docker Logo
GitHub
GitHub Logo
GitHub Actions
GitHub Logo

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
AWS Logo
TypeScript
Typescript Logo
React
React Logo
Node.js
Node.js Logo
MongoDB
MongoDB Logo
React Native
React Logo
GraphQL
GraphQL Logo
tRPC
tRPC Logo
Fastify
Fastify Logo
JavaScript
JavaScript Logo
AngularJS
AngularJS Logo
PHP
PHP Logo
Docker
Docker Logo
GitHub
GitHub Logo
GItHub Actions
GitHub Logo

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
AWS Logo
TypeScript
Typescript Logo
React
React Logo
Node.js
Node.js Logo
MongoDB
MongoDB Logo
React Native
React Logo
GraphQL
GraphQL Logo
Fastify
Fastify Logo
JavaScript
JavaScript Logo
AngularJS
AngularJS Logo
PHP
PHP Logo
Docker
Docker Logo
GitHub
GitHub Logo
GItHub Actions
GitHub Logo

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
AWS Logo
JavaScript
JavaScript Logo
AngularJS
AngularJS Logo
Node.js
Node.js Logo
MongoDB
MongoDB Logo
PHP
PHP Logo
Docker
Docker Logo
CodeShip
Codeship Logo

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.

Education

Where I've studied. ๐Ÿง‘โ€๐Ÿซ

University of St. Andrews Logo
Computer Science
Sept 2012 — Sept 2016 (4 yrs)
University of St. Andrews
Notable Modules
  • Artificial Intelligence
  • Human-Computer Interaction
  • Formal Verification
  • Discrete Mathematics

Extracurricular

Other things I do. ๐Ÿคน

Codebar Logo
Volunteer Coach
Jan 2024 — Present (1 yr, 7 mths)
codebar

I regularly volunteer as a coach at the Edinburgh chapter. Codebar is a charity that facilitates the growth of a diverse tech community by running free programming workshops for minority groups in tech.