Cristian Serb

Full-Stack Engineer & Tech Lead (freelance)

Sep 2006 – Dec 2016 | Jul 2021 – Present

Led and managed diverse project teams to deliver successful software projects for clients in banking, telecommunications, social media, web3/blockchain, and mobile & web ad-tech. Delivered prototypes and production work for blockchain/DLT projects.

Senior Full-Stack Engineer @ Tagesspiegel Berlin

Jun 2023 – Jul 2024

Refactored and improved the Vue.js + GraphQL codebase. Managed CI/CD pipelines (GitHub Actions, Docker) and coordinated full-stack deployments across environments. Proposed and implemented technical/process improvements with the team. Maintained infrastructure for digital and print platforms, including print-system pipeline and Kubernetes clusters. Balanced new feature development with system stability as platforms evolved.

Senior Web3 Full-Stack Engineer @ molecule AG Berlin

Sep 2021 – Nov 2022

Developed a decentralized marketplace for IP rights on Ethereum (ReactJS/NextJS, PostgreSQL, REST APIs) Integrated wallet authentication, smart contract interaction, and secure DLT-based data flows.

Co-founder & CTO @ Watergenics UG Berlin

Mar 2020 – Jul 2021

Co-founded and served as CTO (full-stack) of a startup specializing in water analytics. Led a multidisciplinary team to create a platform for predictive analytics using Ruby on Rails (+Hotwire) and PostgreSQL + TimescaleDB. Managed project and use-case budgets, including responsibility for hardware purchasing and price negotiation.

Interim CTO & Senior Full-Stack Engineer @ amatus Berlin

Jul 2018 – Sep 2019

Inherited a fully remote team, stepping into the role with little prior guidance. Proactively drove a culture of empowerment, enabling seasoned engineers to assume greater responsibility and autonomy in their roles. Led the development and deployment of applications. (Ruby) Further prototyped and productized a large-scale data collection system for real estate, transforming raw datasets into actionable insights for paying customers. (Elixir)

Tech Lead (Backend) @ solarisBank Berlin

Sep 2016 – Jul 2018

Led development of customer-facing web and backend systems (Rails, Grape APIs) Implemented security and compliance requirements in a regulated environment. Mentored team, ran code reviews. Maintained and advanced core microservices powering the solarisBank API architecture, primarily in Ruby and Elixir. Conducted technical and product research for financial products centered around cryptocurrencies.

CTO (Full-Stack) @ Home eat Home

Jan 2015 – Feb 2016

Assumed the role of CTO in an innovative food-tech startup, where I spearheaded the technical strategy for a unique product: smart meal bags sold through customized vending machines. My multifaceted role involved not only overseeing the development process and making key technology decisions but also actively contributing as a developer. I was instrumental in hiring and managing both in-house and outsourced developers, aligning product and technology strategies with business objectives.

Full-Stack Software Engineer

2000 – 2015

From 2000 to 2015, I developed web applications using mainly Ruby on Rails, JavaScript, MySQL, and PostgreSQL, delivering products for organizations ranging from large enterprises like Vodafone to startups like SponsorPay.