Staff Software Engineer

Joshua A.
Ihejiamaizu

Building high-performance browser SDKs and product infrastructure at scale. Currently engineering the systems that power digital experience analytics for millions of websites.

Berlin, Germany · Remote Hotjar | by Contentsquare
joshuaiheji@gmail.com · github.com/joshuaai · linkedin.com/in/joshua-ihejiamaizu

Experience

Hotjar | by Contentsquare Berlin, Germany · Remote · 3 yrs 10 mos
Staff Software Engineer May 2024 – Present
Senior Software Engineer, Frontend Jul 2022 – Apr 2024
  • Lead engineer for the high-performance JavaScript SDK powering Hotjar's global data collection and Contentsquare's Digital Experience Analytics platform.
  • Responsible for the design, scalability, and reliability of core tracking modules deployed on millions of SMB and mid-market websites, capturing billions of user interactions daily.
  • Designed, led, and contributed to multiple platform-level initiatives including end-to-end observability, performant client-side compression, WebSocket fidelity improvements, asynchronous DOM snapshot capturing, and a robust privacy and compliance engine.
  • Continuously deploying to over 1 million active sites per day while maintaining the reliability and performance expectations of a critical third-party script.
HelloFresh Berlin, Germany · 3 yrs 5 mos
Senior Frontend Engineer Jan 2021 – Jun 2022
Software Engineer (Frontend) Feb 2019 – Dec 2020
  • Drove coherent product architecture and engineering processes across the WAC (Weekly Active Customers) tribe within HelloTech.
  • Authored a comprehensive appraisal of HelloFresh's micro-frontend architecture across nine critical areas; identified bottlenecks and proposed a monorepo-aligned solution.
  • Introduced the Block component, laying the foundation for a fully atomic design system that eliminated unconstrained style inheritance.
  • Delivered a declarative, config-driven, framework-agnostic routing upgrade for the account settings fragment, replacing a complex imperative setup.
  • Built a unified forms API in standard HTML format that resolved duplicate and divergent implementations across services, standardising validation and improving customer interactions.
Generation Enterprise · Simulate Education Lagos, Nigeria · Accra, Ghana · ~2 yrs
Software Engineer & Product Lead · Co-Founder 2017 – 2019
  • Co-founded and led product and engineering for Simulate Education, a scenario-based micro-learning platform piloted with banking sector clients in Ghana.
  • Built and shipped SkillNav, a career progression and ratings tool for SMEs across Nigeria, Ghana, and Kenya.
Offshore Dimensions Limited Lagos, Nigeria · 3 mos
Web Developer & Network Engineer Jun 2016 – Aug 2016
  • Rebuilt the company website using modern front-end architecture, replacing an outdated stack with a maintainable, performant implementation.
  • Designed an in-house e-business and content strategy to improve organic search visibility and establish a coherent digital presence.
NIXIT Systems Calabar, Nigeria · 1 yr 6 mos
Co-Founder & Lead, Research & Design Oct 2013 – Mar 2015
  • Co-founded a healthcare software company while at university, leading R&D across a portfolio of mobile applications targeting healthcare, payments, education, and space exploration.
  • Shipped HealthMobile — cited as Africa's first end-to-end healthcare mobile application — reaching 3,000+ active users and earning recognition at NASA Space Apps Challenge Nigeria and LEAP Africa's Social Innovators Program.

Skills

Languages
TypeScriptJavaScriptHTMLCSS
Browser & Platform
Web APIsDOMWebSocketsService WorkersWeb PerformanceBrowser SDKsCore Web Vitals
Frameworks & Tools
ReactNext.jsAstroNode.jsWebpackViteJestPlaywright
Engineering
Micro-frontendsDesign SystemsObservabilityPrivacy EngineeringSDK ArchitecturePerformance Profiling

Education

Meltwater Entrepreneurial School of Technology (MEST) Software Development & Entrepreneurship
Accra, Ghana 2016 – 2017
Federal University of Technology, Owerri (FUTO) B.Eng Electrical & Electronics Engineering
Owerri, Nigeria 2009 – 2014

Recognition

2014
NASA Space Apps Challenge Nigeria Winner — Project: My Earth Observer
2015
The Future Awards Africa Technology Young Person of the Year — Finalist
2014
LEAP Africa Social Innovators Program SIP Fellow — HealthBook Project (malaria/typhoid diagnosis platform)
2012
Enactus Nigeria Technical Director & National Champion — Represented Nigeria at the Enactus World Cup, Washington D.C.