# Pieter D. > AI Engineer | Software Engineer (Python, Node, React, React Native) Location: Miami, Florida, United States Profile: https://flows.cv/pieter Software Engineer 7 years experience. Experience in consumer finance, e-commerce, digital agriculture, solar energy, medical consumer software. Company types ranging from seed-stage through fast-growth venture to public companies, with a variety of team sizes and cultures. Highly experienced in cross-functional collaboration, icl. Product Management, Design/UX(R), Legal/Compliance, etc. Strong quantitative, BSc. Applied Mathematics. Exposure to HIPAA and PCI compliance. ## Work Experience ### Senior Software Engineer @ Base Jan 2024 – Jan 2024 | Miami, Florida, United States Base is a membership club oriented entirely around in-person, highly curated, and algorithmically matched dinners and experiences, with personal authenticity is the foundation. * Tech stack: React Native, Typescript, TailwindCSS, Supabase (Postgres), PostgREST, Expo + Expo Application Services (EAS), Sentry, CustomerIO, Deno javascript hosted functions, Firebase Messaging. * Owned development of mobile app, members' primary method if interacting with Base, and only method of booking dinners and experiences. * Built and launched foundational features such as "Perks", "Connect", and "Awards", that added social networking, gamification, and premium partnerships to the platform. * Used marketing tools to measure feature performance and member engagement. * Directly diagnosed and fixed members' issues with app interactions such as login of booking. * Responsible 24/7 for critical issues, including * Cross-functionally worked with Member Success, Experiences. * Worked directly with Founders and early employees brainstorm business and product, and with CTO to conceive and prioritize new features. * Performed technical interviews for engineering candidates. ### Software Engineer @ G2i Inc. Jan 2023 – Jan 2024 G2i / Upwork * Fullstack engineer on G2i platform serving global clients in web and product development. * Trained and validated specialized AI models requiring advanced Mathematics training. * Performed PySpark data analysis. Experienced with the use AI (LLMs) in the following modalities: * Python/FastAPI backend integration with OpenAI API to generate text autocomplete. * ChatGPT Pro in to explore new technologies, brainstorm projects, and generate draft boilerplate code. * Cursor IDE for simple code snippets, and interactive chat about the codebase. ### Senior Software Engineer (Backend) @ Stash Jan 2018 – Jan 2019 | New York, New York, United States * Owned backend for entire user registration flow, built on Rails monolith and Postgres. Lead roadmap and SLAs development, consistently provided backend constraints into the product development process. * Deployed twice-weekly using Spinnaker CI/CD pipeline on GitHub/Jenkins. On-call PagerDuty monthly. * Lead backend implementation of LaunchDarkly 5-variant A/B test on highest tier subscription price, directly resulting in C-Suite decision to 3x its price, directly increasing primary input to customer LTV. * Lead project to decrease erroneous KYC results percentage from ~25% to ~5% on a daily signup volume of ~10k users, by working with brokerage back-office and web/mobile engineers to iteratively define, backtest, and implement validation rules on ~20 registration input fields. * Helped build Rails models and routes for new feature to allow purchase of 100+ stocks/ETFs by potential or current users. Resulted within weeks of launch in ~10MM total search volume, ~2MM+ page views, and ~$150 average per-user securities purchases. * Tested backend-driven UI content or flow changes in development and staging environments. * Cross-functional work included: daily collaboration with product management, web/mobile, data science; and frequently with brokerage, compliance, marketing/copy, QA, and adjacent engineering teams. * Production responsibility included PagerDuty shifts, logs monitoring, NewRelic system performance diagnostics, Slack alerts, and Looker-based anomaly analysis. * Profiled and stress tested Rails monolith using New Relic as part of CTO-designated team to assess improvement opportunities for Rails monolith. Team concluded the current app was sufficiently resilient. ### Software Engineer (Product) @ Etsy Jan 2017 – Jan 2018 | New York, New York, United States * Team of five built and launched marketing features for the 2MM+ Sellers on the platform, including “Promoted Offers” allowing sellers to promote specific listings; using PHP7, sharded MySQL, and React/Redux, i18n internationalization. * Launched features to selected user buckets using server-side feature-flags. Worked with Data Science and Product to define user buckets and experiment duration to avoid interference with other experiments. * Tested start-to-end seller and buyer flow using carefully customized test accounts and feature-relevant purchase scenarios. Deployed code daily using custom-built “Deployinator” pipeline. * Built product dashboard using Grafana and internal logs, to track post-launch engagement and performance metrics. ### Software Engineer (Data Analytics) @ The Climate Corporation Jan 2016 – Jan 2017 | San Francisco Digital Agriculture. dedicated to creating technologies that transform field data into meaningful insights that help farmers sustainably enhance yield potential, improve efficiency, and manage their risk. * Owned and expanded data pipeline built on AWS Kinesis, Python ETL, and Postgres warehouse with 200+ tables. * Maintained staging and production AWS infrastructure on S3, EC2, Docker, and CloudWatch monitoring/alerting. * Added ingests from 3rd party APIs including Mandrill, and guarded against schema proliferation. * Tested ETL speed and resource load improvements by optimizing SQL statements and monitoring impact using CloudWatch, concluding that scaling challenges lay elsewhere. * Used Spark and Scala to build message bus module and contribute to data science warehouse, as part of team effort to re-architected pipeline in anticipation of increased scale. * Wrote and distributed analytics specification documents based on Product Managers requirements. * As team grew from 5 to 12+, helped prioritize scaling challenges based on effort and severity, at Analytics VP’s request, and edited/reviewed Principal engineers’ proposal for data infrastructure upgrades. ### Software Engineer (Big Data Consultant) @ Nvent Jan 2015 – Jan 2016 | San Francisco Big Data Consultancy. Gained exposure to technologies such as technologies include Hadoop, MapReduce, Hive, Pig, HBase, Kafka, Apache Spark, Storm, Docker, Vagrant, Ansible. - Attained certificates in Spark Developer, Hadoop, HBase, and Pig/Sqoop - Developed technical content for 12-week Data Engineering Immersive curriculum, including interactive exercises in Python Notebooks and lecture notes in Markdown. Curriculum included HDFS, MapReduce, Storm, Solr, Spark and Docker. ### Sr. Web Applications Engineer @ SolarCity Jan 2014 – Jan 2015 | San Francisco SolarCity (acq. Tesla 2016) is the leader in full-service solar power systems for homes, businesses and governments providing custom design, financing, installation & monitoring. * Team of 5 engineers owned internal tools for residential system design, customer solar proposal generation, and crew management. * Reduced latency from ~30+ sec. to ~<200ms for an internal mission-critical tool to generate system designs and financial proposals, by identifying performance bottlenecks using ASP.NET profiling tool and implementing server-side query result caching. * Reduced by 15% the daily mean driving time for 100+ field crews using a scheduling optimization algorithm written in SQL, C#, and Maps API. Distributed daily email recommendations to relevant executives. * Built real-time "Time of Arrival" feature including back-end and mobile UI using HTML/CSS, later featured in Washington Post, used by 100+ customers daily to receive Twilio API-powered SMS notifications and GPS-based location for crew appointments. * Diagnosed and resolved missing technical and human links in 100s of daily customer experiences for “Time of Arrival” feature, resulting in initial increase from ~10% to ~80%+ for fully complete experiences. * Identified time of anomaly for Hawaii-based power inverters using IPython notebooks and matplotlib for time series analysis. ### Software Engineer @ MedWhat (AI-powered Medical Assistant) Jan 2013 – Jan 2013 | Palo Alto Stanford-backed seed-funded five-person startup creating a personal medical assistant app. Company provides instant trusted answers to your health and medical questions. - Quickly learned complex multi-server architecture including distributed MySQL databases, Tomcat - Java Servlets and a Lucene-based search engine. - Managed several AWS instances, assessed scaling needs based cpu usage and database size metrics. - Improved quality of data sources by removing non-relevant content, resulting in 30% increased relevance and 10% increased accuracy of query answers - Performed UX research by having 20+ passersby try the app in local mall and recording their comments, resulting in key UX insights - Lead social media engagement; regularly posted tailored content to Facebook and Twitter; resulting in 200% increase in "Likes" and 10 Retweets - Recorded key performance metrics from disparate sources on daily basis, enabling weekly performance tracking - Performed exploratory analysis using R on user questions and data source size ### Web Developer (Contract) @ Singularity University Jan 2012 – Jan 2013 | NASA Research Park, Moffett Field, CA Singularity University’s mission is to assemble, educate and inspire a new generation of leaders who strive to understand and utilize exponentially advancing technologies to address humanity’s grand challenges. I'd followed Singularity University almost since its founding; since I'm highly passionate about leveraging exponentially accelerating technologies to solve humanity's grand challenges, working with SU was an amazing opportunity. - Worked within 7-person Media Team and with off-site contractors to launch revamped website singularityu.org, based on existing Wordpress installation - Created ~10 web pages using Wordpress, PHP, HTML5 and CSS3 based on pdf mockups - Post-launch, worked with internal stakeholders to optimize layout and content - Implemented regular updates for FutureMed website at personal request of Executive Director ### Software Engineering Intern, Fraud/Risk Engine @ WePay Jan 2012 – Jan 2012 | Palo Alto, California YCombinator-backed, series-C funded startup offering flexible payments API specifically built for platforms At WePay, I experienced the pace, energy and strong culture that comes with a Series-B funded fast-growing startup. - Quickly learned object-oriented PHP code base and complex ORM-based payments data model - Contributed to core signals-based fraud/risk engine from start of implementation, launched in May ‘13 as “Veda proprietary social risk engine” - Designed and implemented SQL schemas and database interface to record signals for each payment - Implemented 200+ signals including integration with Facebook API ### Academic Assistant @ University of Maryland School of Medicine Jan 2011 – Jan 2012 Center for Mental Health Services Research (CMHSR) The CMHSR conducts applied research and policy studies on the delivery of services to person with severe and persistent mental illnesses. Non-patient-facing supporting role. Learned much about the academic environment, grant applications, Institutional Review Boards (IRBs), health research programs, health policy and field research. - Completed training on HIPAA patient privacy regulation ('Personal Health Information') and FDA clinical trial regulations ('Good Clinical Practice') - Calculated patient hospitalization statistics from digitized family visit records using Excel - Performed highly detailed data validation on thousands of confidential patient research surveys - Assisted in planning of pilot study of use of smartphones in personalized mental health interventions ### Independent Tutor Mathematics @ self-employed Jan 2007 – Jan 2011 - 4 Years independent math tutoring, including sourcing and maintaining client relationships - Taught two-day course for high school students to prepare them for final math exam; presented summary of curriculum, discussed example exercises from previous exams; assisted students one-on-one ## Education ### BSc. in Mathematics University of Amsterdam Jan 2004 – Jan 2010 ### Advanced Software Engineering Immersive Hack Reactor Jan 2013 – Jan 2014 ### Software Engineering CodePath Jan 2014 – Jan 2014 ### Minor in Business Studies University of Amsterdam Jan 2010 – Jan 2011 ### VWO (Pre-University Education) in Science, Nature & Health Goois Lyceum Jan 1998 – Jan 2004 ### Summer School in Computer Science Brown University Jan 2003 – Jan 2003 ### Master of Science - MS in Computer Science Georgia Institute of Technology Jan 2024 – Jan 2027 ## Contact & Social - LinkedIn: https://linkedin.com/in/pieteradejong - Website: http://www.aegee-amsterdam.nl - Website: http://www.aegee.org --- Source: https://flows.cv/pieter JSON Resume: https://flows.cv/pieter/resume.json Last updated: 2026-03-22