Alex Testington
Senior Product Engineer
Product-minded engineer with 8+ years building B2B SaaS. Strong in React, TypeScript, and system design. Led migration of legacy stack to modern frontend; reduced load time by 40% and improved core web vitals.
Berlin, Germany
Key Highlights
Led frontend migration for 3 product lines; reduced bundle size by 35% and improved LCP by 40%
Shipped design system used by 12 teams; cut design–dev handoff time by half
Mentored 4 junior engineers; two promoted to mid-level within 18 months
Drove adoption of E2E testing; regression bugs in production dropped by 60%
Professional Experience
Senior Frontend Engineer
ScaleUp GmbH
2021-03 - Present
Berlin, Germany
- •Owned frontend architecture for billing and account management; improved reliability and reduced support tickets by 25%
- •Introduced React Query and standardized API layer; decreased duplicate requests and simplified state
- •Collaborated with design on new component library; 80+ components, full accessibility audit
Full-Stack Developer
StartupLabs AG
2018-06 - 2021-02
Munich, Germany
- •Built customer dashboard and reporting from scratch (React, Node, PostgreSQL)
- •Implemented SSO and role-based access; onboarded 50+ enterprise customers
- •Set up CI/CD and monitoring; reduced deployment time from 2 hours to 15 minutes
Junior Developer
WebDev Solutions
2016-09 - 2018-05
Hamburg, Germany
- •Developed and maintained client websites using React and WordPress
- •Improved page performance and SEO for 10+ client projects
Notable Projects
Open Design Tokens
Open-source CLI and Figma plugin to export design tokens for multiple platforms. Used in 5 internal products.
TypeScriptNode.jsFigma API
View projectConference Talk: React at Scale
Spoke at local meetup about state management and bundle splitting in large React apps.
ReactWebpack
Skills & Technologies
Frontend
ReactTypeScriptNext.jsHTML / CSSTesting Library
Backend
Node.jsPostgreSQLREST APIs
Tools
GitDockerFigma
Practices
AgileCode ReviewAccessibility
Education & Certifications
M.Sc. Computer Science
Technical University Example
2014 - 2016
Berlin, Germany
B.Sc. Software Engineering
University of Example
2010 - 2014
Hamburg, Germany
Certifications
AWS Certified Developer – Associate
Amazon Web Services
2020-08
Professional Scrum Master I
Scrum.org
2019-03