Ferran Delgado Cassi

Backend Developer

📱 +34 658 904 966 | ✉️ ferran.delgado@protonmail.com

🔗 LinkedIn | 💻 GitHub Web: https://cv.narref.cat/

Profile

Passionate software engineer with 10 years of experience building data-intensive, distributed, and high-scale systems. Proven track record across multiple domains—spanning real-time bidding systems processing 10K+ QPS at Trovit, event-driven microservices at Zopa, global-scale gaming infrastructure at King, and high-growth gaming and Web3 platforms at Amihan. Adept at tackling complex architectural problems, scaling cloud infrastructure, and mentoring cross-functional engineering teams.

Technical Skills

Languages:	Go, TypeScript, JavaScript, Kotlin, Java, Solidity, Python, PHP
Data & Streaming:	Redis, Postgres, MySQL, SQL Server, Kafka, Kafka-Streams, Spark, Hadoop
Cloud & DevOps:	AWS, GCP, Terraform, Docker, Kubernetes, Helm
Frameworks:	Next.js, React, Vue, Gin, Caddy, Ktor, Ratpack

Experience

Framer / Senior Software Engineer

Jan 2026 – Present | Remote

Core member of the backend hosting team, ensuring high-performance delivery of client pages under a strict 99.999% uptime SLA.
Maintain platform reliability, speed, and horizontal scaling while acting as an internal infrastructure and DevOps partner.
Provide technical guidance, architectural oversight, and cross-functional support to accelerate engineering velocity across the organization.

Tech Stack: TypeScript, Go, Terraform, AWS

Amihan / Tech Lead & Staff Software Engineer (Gaming & Web3)

Jan 2023 – Oct 2025 | Remote

Promoted to Staff Engineer and Tech Lead to drive full-stack backend development, cloud architecture, and Web3 game strategy.
Directed the launch of a Telegram-based gaming application, rapidly scaling the platform to over 500,000 monthly active users (MAU).
Architected and deployed Solidity smart contracts on the Ethereum and Base blockchains, implementing an ERC20 token ecosystem and custom wallet integrations.
Guided cross-functional engineering teams through technical mentorship, architecture reviews, and clean design patterns.

Tech Stack: Solidity, Go, Kotlin, TypeScript, AWS, Terraform, Postgres, Redis, Vue, Next.js, React

Administrate / Team Lead & Senior Developer

Sept 2021 – July 2022 | Remote

Led a cross-functional engineering team as Tech Lead, serving as the primary technical point of contact across department leads to align project delivery with business goals.
Managed team motivation, established development velocity initiatives, and steered technical execution.
Developed and maintained core web applications, contributing across a hybrid Python/PHP backend and an Angular/React frontend.

Tech Stack: Python, PHP, MySQL, TypeScript, JavaScript, Angular, React

King / Senior Backend Developer

June 2020 – Aug 2021 | Barcelona

Designed and built a highly scalable backend ecosystem to serve multiple global mobile games, allowing seamless A/B experimentation and continuous feature rollout.
Shipped global-scale game features under tight timelines using lean methodologies to continuously test and validate player hypotheses.
Orchestrated the deployment of isolated, cloud-native QA and testing environments by migrating key infrastructure and services to GCP.

Tech Stack: Java, Gradle, Docker, Terraform, Helm, GCP, SQL

Zopa / Backend Developer

Aug 2017 – Jan 2020 | Barcelona - London

Engineered a core peer-to-peer lending backend engine that systematically distributed loan risk among lenders, stabilizing portfolio volatility.
Architected a distributed messaging system capable of processing 7 million messages daily while serving real-time visualization data to the frontend.
Co-led the engineering migration from a legacy monolith architecture over to scalable, event-driven microservices.

Tech Stack: Kotlin, Java, Kafka, Kafka-Streams, Ktor, Ratpack, Redis, PostgreSQL, SQL Server

Trovit / Data Engineer

Mar 2015 – Aug 2017 | Barcelona

Developed an intensive, low-latency data application to communicate with Google’s Real-Time Bidding system, handling 10,000+ QPS.
Built heavy batch processing data pipelines to analyze and train the core bidding algorithm.
Spearheaded a stack migration for the AdWords team, adopting Scala and Spark to process big data.

Tech Stack: Java, Scala, Spark, Hadoop MapReduce, Kafka, Redis

Aersa / Web Developer | Mar 2014 – Jan 2015 | Built internal field-tooling automation and asset management software for windmill maintenance.

Mobetia S.L / Developer | Sept 2013 – Feb 2014 | Developed client-facing features across Android, iOS, and mobile web platforms.

Education

UPC Universitat Politècnica de Catalunya Barcelona | 2008 – 2014
Degree in Informatics Engineering (BSc + MSc equivalent)

Vrije Universiteit Brussel Brussels | 2011 – 2012
Computer Science: Applied Sciences and Engineering (Erasmus Exchange)

Volunteer Work

North Bali Reef Conservation July 2019
Volunteer – Coral reef ecosystem restoration and community conservation work

Voluntaris per la llengua 2017 – 2018
Language Mentor – Catalan cultural and language exchange program

Languages

Catalan (Native) | Spanish (Native) | English (Fluent)

Additional Interests

Away from the laptop, I can usually be found building human towers with the Castellers of Sagrada Familia, competing in open-water swimming events, or doing pottery.