# William Schiller > Solidity Engineer Location: United Kingdom, United Kingdom Profile: https://flows.cv/williamschiller Senior Solidity Engineer with 5+ years of experience specializing in Institutional smart contract DeFi architecture and fullstack Dapp development. Expert in the ERC-4626 standard and Veda BoringVault frameworks. Proven track record of architecting secure, automated trading infrastructure and bridging complex on-chain logic with TypeScript backends. ## Work Experience ### Solidity Engineer @ Ghaf Group Jan 2026 – Present | Dubai, United Arab Emirates ### Blockchain Engineer / Founder @ DeFi Data Jan 2023 – Present | Greater London, England, United Kingdom ### Lead Solidity Engineer @ Paravel Citadel DAO LLC Jan 2025 – Jan 2026 | London Area, United Kingdom • On-Chain Architecture: Designed and implemented a multi agent/multi vault leveraged yield platform by extending the Veda BoringVault framework. 69 smart contracts deployed to mainnet with 150 ETH cumulative execution volume. • Backend & Data Integration: Built a production TypeScript (NestJS) backend that backfills on-chain data to track deposits, calculate NAV with Chainlink feeds, and serve data to the frontend. • Security Ownership: Owned end-to-end testing using Foundry fuzz suites, specifically targeting flash-loan-based leverage loops. ### Smart Contracts Developer and Associate Auditor @ Jita Digital Jan 2024 – Jan 2025 ### Lead Solidity Engineer @ NEXADE Jan 2024 – Jan 2025 | Singapore • New implementation synthetix contract of MasterChef State Management to resolve snapshot synchronization issues. • Frontend Integration: Integrated backend APIs into a Next.js dashboard, implementing client-side logic for vesting schedules and real-time contract state visualization. • Managed the secure deployment of a UUPS-proxy token with peak $16.1M FDV (fully diluted value). • Wrote a comprehensive Foundry invariant test suite that identified a critical rounding-error bug in reward distribution; resolved the vulnerability by implementing high-precision 1e27 scaling and mulDiv fixed-point math. ### Blockchain Engineer @ Extropy.io Jan 2022 – Jan 2023 | London, England, United Kingdom Developed software applications using test-driven development (TDD), wrote unit, fuzz and invariant tests, and used static analysis tools for code security auditing. Built Next.js applications and deployed them using git and basic CI/CD principles. Project lead for on-chain smart contract assessment system using Ethereum and Next.js (https://www.solidityctf.xyz/), providing recruitment data for Encode (https://www.encode.club) and increasing billable hours for the company by 160 hours. Designed and implemented blockchain data models for on-chain assessment systems. Led technical workshops on Zoom with audiences of 100 or more. ### Business Intelligence Manager @ ForwardPMX Jan 2021 – Jan 2021 Founded and developed ETL pipelines, initiating data modelling for the nascent BI team through integrating DBT internal systems and BigQuery, culminating in establishing a comprehensive data warehouse. This foundational work was pivotal in streamlining data management and analytics processes, laying solid groundwork for advanced data analysis and strategic decision-making. Spearheaded refining, transforming, and visualising extensive datasets from various APIs, crafting succinct and informative reports. These reports have empowered analysts and stakeholders with critical business insights, enhancing strategic planning and operational efficiency. Engineered intricate SQL/DBT queries to facilitate detailed data analysis and the generation of reports in Google Data Studio. This technical prowess has enabled the extraction of nuanced insights from complex datasets, supporting a data-driven approach to business intelligence. Devised and continuously refined KPI measurement frameworks for various digital media channels, including social media, display advertising, paid search, apps, and affiliate marketing. This initiative has ensured the ongoing assessment and optimization of marketing strategies across diverse platforms, driving performance improvement and achieving strategic marketing objectives. ### SEO Manager @ ForwardPMX Jan 2019 – Jan 2020 | London, United Kingdom Crafted and executed advanced SEO strategies for distinguished clients, including MCM and Nike, which substantially improved their online visibility and user experience. This strategic approach underscored the importance of digital optimization in enhancing brand presence and engagement. As an account lead, I pioneered the automation of content updates through Salesforce CMS for MCM. This innovation halved unnecessary billable hours, fostering client trust and facilitating the account's expansion into five additional markets. This achievement highlights the value of efficiency and client-centric solutions in account management. Managed and provided mentoring to junior team members, focusing on implementing and tracking Objectives and Key Results (OKRs) to ensure alignment with the company's strategic goals. By assigning tasks and managing schedules, I optimized team performance and productivity, reinforcing the importance of goal-oriented leadership. Leveraged SQL to develop ETL pipelines, enabling the analysis of trends and the creation of data visualizations. This technical expertise facilitated deeper insights into market dynamics and customer behaviour, supporting informed decision-making and strategic planning in digital marketing efforts. ### Client Success & SEO Account Manager @ Linkdex Jan 2018 – Jan 2019 | London, United Kingdom The team provided search engine optimisation and technical consultancy based on Google best practises. * Communicating, pitching & managing client relationships to increase and retain accounts. * Providing tech support on products. * Working with leading customers such as Skyscanner, The Telegraph & Mindshare. ### SEO Executive @ Moneysupermarket Group Jan 2012 – Jan 2014 | Chester, United Kingdom ### SEO Developer @ Think Money Jan 2011 – Jan 2012 | Manchester ## Education ### Foundation degree in Commerical Music Technology in University of Central Lancashire University of Lancashire ### Sir John Deane's Sixth Form College ### G.C.S.E. results in including English; Maths, Science, business and French North Cestrian Grammar School ## Contact & Social - LinkedIn: https://linkedin.com/in/willschiller - Website: https://willschiller.com?l --- Source: https://flows.cv/williamschiller JSON Resume: https://flows.cv/williamschiller/resume.json Last updated: 2026-04-05