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I'm a Senior Fullstack Engineer with 8+ years building scalable, transaction-heavy platforms using Node.js, React, and TypeScript. I focus on delivering resilient backend services and polished frontend experiences for global financial and fundraising products. I blend deep system ownership with a product mindset to support mission-critical workflows, collaborating across product, compliance, and engineering teams to ship robust, auditable software at scale.…I'm a Senior Fullstack Engineer with 8+ years building scalable, transaction-heavy platforms using Node.js, React, and TypeScript. I focus on delivering resilient backend services and polished frontend experiences for global financial and fundraising products. I blend deep system ownership with a product mindset to support mission-critical workflows, collaborating across product, compliance, and engineering teams to ship robust, auditable software at scale.

Andrei Dionisie

Full Stack Developer, Web Developer, Back-End Developer, +2

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I'm a Senior Fullstack Engineer with 8+ years building scalable, transaction-heavy platforms using Node.js, React, and TypeScript. I focus on delivering resilient backend services and polished frontend experiences for global financial and fundraising products. I blend deep system ownership with a product mindset to support mission-critical workflows, collaborating across product, compliance, and engineering teams to ship robust, auditable software at scale.…I'm a Senior Fullstack Engineer with 8+ years building scalable, transaction-heavy platforms using Node.js, React, and TypeScript. I focus on delivering resilient backend services and polished frontend experiences for global financial and fundraising products. I blend deep system ownership with a product mindset to support mission-critical workflows, collaborating across product, compliance, and engineering teams to ship robust, auditable software at scale.

Available to hire

I’m a Senior Fullstack Engineer with 8+ years building scalable, transaction-heavy platforms using Node.js, React, and TypeScript. I focus on delivering resilient backend services and polished frontend experiences for global financial and fundraising products.

I blend deep system ownership with a product mindset to support mission-critical workflows, collaborating across product, compliance, and engineering teams to ship robust, auditable software at scale.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Aragonese

Intermediate

Work Experience

Senior Software Engineer at PilotFinance

July 1, 2024 - February 1, 2026

Built and scaled core financial transaction services with Node.js (NestJS) and React for a global user base. Migrated legacy monolithic services to a modular microservices architecture, improving deployment independence and reducing system-wide failures. Optimized MongoDB queries and indexing, reducing API latency for critical endpoints. Implemented a Kafka-based event streaming system for asynchronous processing, improving resilience during peak loads. Led refactoring of a brittle payment reconciliation service and developed a reusable React component library with TypeScript and Storybook. Established comprehensive monitoring and alerting to improve MTTD for production incidents.

Software Engineer at Deel

November 1, 2023 - July 1, 2024

Developed and maintained features for a global payroll and compliance platform using React, TypeScript, and Node.js. Built internal tools to streamline contractor onboarding and payments, integrated with multiple third-party providers, and implemented code-splitting and lazy loading to reduce initial bundle size. Resolved production issues in cross-border payments and currency conversions; participated in on-call rotations; authored unit and integration tests; refactored legacy endpoints for clearer frontend and support feedback.

Software Engineer at Meta

November 1, 2020 - October 1, 2023

Contributed to large-scale internal platforms using React and Python/Django. Built data-intensive admin interfaces with advanced filtering, sorting, and export capabilities. Optimized backend performance by addressing N+1 queries and serialization inefficiencies; designed RESTful APIs to support new product features and internal reporting needs. Containerized services with Docker and improved CI/CD pipelines; addressed background job processing and data synchronization delays; developed automated data validation scripts and participated in code reviews and architectural discussions.

Software Engineer at Zopa Bank

March 1, 2018 - October 1, 2020

Developed customer-facing features and internal services for a digital bank using Angular, .NET, and Python. Built loan application and management systems ensuring data accuracy and regulatory compliance; implemented real-time notifications via message queues; created financial dashboards aggregating data from multiple microservices. Improved security with robust authentication/authorization; supported cloud migration and provided 3rd-line production support across frontend, API, and database layers.

Software Developer at Wirex

June 1, 2016 - February 1, 2018

Built features for a cryptocurrency payment platform using PHP (Laravel/Symfony) and JavaScript. Developed UIs for wallets and transaction histories; integrated with blockchain APIs and payment gateways; built internal admin panels for customer support and financial monitoring. Wrote SQL queries and optimized database performance for high-frequency transaction logging; participated in agile ceremonies and collaborated with designers to implement user-centric features.