Tania Papazafeiropoulou

Senior Mobile Engineer (Contract)

The Ready Collective

Three-month contract to design and launch the R1 platform's cross-platform mobile app. Working alongside a former Olio colleague - the same founding-team setup that shipped Olio's consumer React Native app from scratch within 3 months.

• Building the R1 consumer React Native app for iOS and Android from the ground up, targeting a production launch within a 3-month engagement.
• Contributing to the Next.js web app and Node.js/Express backend.

Front-End Tech Lead

Olio

A growing B2C/B2B scale-up focused on food redistribution. Joined when the company had <20 employees and 3 developers; contributed across its growth to 100+ employees and millions of users.

• Owned front-end direction across partner and volunteer platforms, balancing product needs, UX quality and maintainability.
• Led re-architecture of a 10-year-old scheduling system. Incremental migration with feature flags and rollback, zero user disruption, eliminated long-standing bugs.
• Led i18n initiative across the partner platform: Luxon integration for locale-aware date/time handling, added Chinese language support.
• Improved performance, accessibility and reliability through refactoring, monitoring and reducing technical debt.
• Worked closely with product, design, operations and backend to turn complex workflows into clear, maintainable UI solutions.
• Prototyped new ideas during internal hackathons (partner platform, AI-assisted appointment planner) to validate concepts and inform next steps.
• Mentored engineers through pairing and code reviews while remaining a strong IC, writing production code daily and unblocking complex technical problems.

Senior Front-End Developer

Olio

• Promoted from Mid-Level to Senior within 1 year based on performance.
• Key contributor to building and stabilising Olio's React Native consumer app from scratch. Helped ship the initial version within 3 months as part of a small team.
• Managed regular App Store and Google Play release cycles, coordinating with product, QA and backend teams.
• Optimised map marker and cluster rendering so it only runs when data changes, improving performance on list and map views.
• Led migration of the Volunteers platform from Rails views to a modern React SPA. Established routing, navigation, and component patterns from scratch.
• Extended the Volunteers platform beyond the initial migration: designed and built new flows to support charity volunteers alongside Olio volunteers.

Front-End & App Developer

Esquared Technologies

• Delivered features on an Angular2 app, working closely with founders and designers.

Web Developer

Cult Beauty

• Built UI features for a high-traffic e-commerce site. Worked on checkout and payment flows, integrating third-party payment methods including Klarna and PayPal. Contributed to both frontend and backend PHP code.

Web Developer

IDG UK

• Developed editorial and publishing tools for websites including PC Advisor, Macworld, ComputerWorld, Digital Arts Online and TechWorld.

Junior Software Developer

Kantar Worldpanel

• Built internal data tools and reporting automations.