Juan David Nicholls Cardona

Atlas helps companies onboard and manage distributed workforces globally, providing compliance and HR solutions.

Achievements:

• Reduced frontend load times by ~50–60% by eliminating ~5 backend microservice calls per request through server-side rendering and unified APIs.

• Improved onboarding reliability by redesigning Excel export workflows, reducing failures and manual retries by ~70%.

• Enabled zero-downtime migration of the core onboarding flow using feature flags, supporting continuous delivery with no production incidents.

Responsibilities:

• Migrated legacy ASP.NET services into a Node.js/Express + SSR frontend architecture.

• Implemented full-stack observability (Datadog RUM/APM, Azure Application Insights, structured logging).

• Optimized CI/CD pipelines in Azure DevOps and supported trunk-based development with feature flags.

• Collaborated with Product, SRE, and HR teams on core employee onboarding features.

- Created a scalable and secure system for the BAXUS platform using NestJS and Temporal workflows, enabling a user base growth to 25,000 users.
• Enhanced user engagement and experience through a visually appealing UI, resulting in a 30% user retention rate (users spending an average of 15 minutes per session).
• Contributed to open-source projects (nestjs-temporal, etc), authored technical documentation, and shared knowledge, positioning BAXUS as an industry thought leader (through participation in conferences such as Solana Breakpoint and Hacker House).
• Implemented features for BoozApp with React Native such as private bottle creation, barcode scanning and enhanced search using Algolia, enhancing user satisfaction by 25% (based on positive user feedback and reviews).
• Developed a monorepo for the BAXUS marketplace using Nx, React, RemixJS and TailwindCSS, leading to a 50% increase in conversion rates (from initial launch, reaching a 3% conversion rate).
• Boosted website performance by 35% (measured by faster page load times), accessibility by 20% (compliance with WCAG standards), and SEO rankings by 15% (higher search engine visibility) by implementing Google Lighthouse best practices.
• Designed a secure backend using NestJS and external authentication providers (Web3Auth, Magiclink, Passport), enhancing security practices and ensuring data protection (maintained with no data breaches).

• Led the engineering effort to refactor Angular/NgRx/Ionic codebases, improving code reusability across web and mobile platforms, while enhancing the checkout flow with better state management, functional programming and new UX features.

• Developed microservices with NestJS and Kafka, streamlining communication with third-party providers such as Uber Eats.

• Created proof of concepts and demos for the client, also collaborated on provider integrations, contributing to a 20% increase in customer acquisition.