Mark Castillo Email & Phone Number

Sacramento, Ca, Us

San Francisco, Ca, Us

As a Sr. Customer Success Architect at GitHub, I drive customer success through technical guidance and strategic planning, specializing in GitHub Copilot AI and Advanced Security. My proactive approach fosters product adoption and retention, with tailored adoption plans and roadmaps enhancing customer engagement with GitHub's suite of features.I provide architectural assessments, best practice guidance, and design integrations to optimize CI/CD processes. My role involves presenting new features, capturing feedback for product enhancement, and advocating for customer needs within GitHub.I lead initiatives for Community of Practice and InnerSourcing, develop best practices, and support customers through beta programs and technical challenges. My contributions include webinars, blogs, and community engagement, ensuring customers maximize their GitHub investment and align their technical strategies with business goals.

Newark, California, Us

At Privacera, a Silicon Valley startup, I held a pivotal role as a Sr. Solutions Engineer, spearheading pre-sales engineering for PrivaceraCloud and Privacera Platform. My role was a unique blend of technical prowess and customer engagement, which involved seamless collaboration with Account Executives, Engineering, and Product Management during the sales process.Navigating the challenges of working with a relatively new product in a fast-paced market, I successfully closed substantial deals with major clients. This achievement not only underscores my ability to adapt and thrive in dynamic environments but also highlights my commitment to driving customer success and business growth.

San Francisco, Ca, Us

At OverOps, a dynamic San Francisco startup, I played a pivotal role as a Solutions Engineer, bridging the gap between pre-sales and post-sales activities for our enterprise clientele. My responsibilities encompassed working closely with sales representatives to expand accounts and secure renewals, a testament to the trust and success we cultivated with our customers.I was instrumental in fostering robust customer relationships through engaging product demonstrations, proof-of-concept (POC) presentations, and regular training sessions. These initiatives not only enhanced customer engagement but also facilitated their understanding of our product’s value proposition.In addition to these roles, I served as the Subject Matter Expert (SME) during the initial launch of the .Net version of OverOps, further showcasing my versatility and technical acumen.Technologies: AWS, Azure, Docker, Kubernetes, Java, Scala, .Net, C#, Linux, Windows.

Santa Clara, California, Us

As a solutions engineer at Hortonworks, I worked alongside sales account managers on demos, POCs, and other pre-sales activities for the Hortonworks platform. I engaged customers in architectural discussions to envision the end goals for the POC use cases and designed architecture involving the careful selection of HDP components.Technologies: Hadoop, HDP, AWS, Azure, OpenStack, Spark, EMR

New York, Ny, Us

At Gap, I served as a Software Iteration Manager and Scrum master for software development teams based in San Francisco and Brazil.

As a Sr. Solutions Architect at Driven Inc., a San Francisco startup, I was a key player in the product lifecycle, from orchestrating pre-sales demonstrations to providing post-sales technical support. I served as the primary technical liaison for Driven, Cascading, and Scalding, offering comprehensive developer support that included code samples, tutorials, demos, webinars, and training.I led a variety of projects, prototyping in Java, Scala, and Ruby, and was instrumental in integrating our product into the AWS Marketplace. I also tested new features by deploying them into AWS (EC2, ElasticSearch, EMR) and maintained the code for training materials in Java and Scala.In my architectural capacity, I was actively involved in installation and integration planning with customers for both on-premises and cloud (AWS or Azure) environments. I also served as an on-site architect for a financial company for 6 months, driving developer adoption of Cascading and Driven.Technologies: Cascading, Scalding, Java, Scala, Hive, Spark, Hadoop, AWS, EMR.

San Francisco, Ca, Us

At LOYAL3, a pioneering FinTech startup, I held the dual roles of Senior Software Engineer and Technical Lead. I was instrumental in developing a microservices architecture that utilized a diverse array of languages (Scala, Clojure, Ruby, Go), and was deployed both on-premises and on AWS.As the Technical Lead for the SMS project, I ensured the timely delivery of text messages to IPO participants, enhancing the user experience. My role as an individual contributor involved overseeing the microservices architecture, infrastructure, and best practices, which significantly improved both customer-facing areas and back-end integration.My technical contributions spanned various aspects of the system, including the data sanitizer, SalesForce integration, IPO web app, and mobile service API. I also implemented system enhancements across services to optimize performance.In my architectural capacity, I designed the SMS service to integrate seamlessly with the main application architecture and databases. All application services were hosted on AWS (EC2, ELB, RDS, SNS, SQS, CloudWatch), demonstrating my proficiency in cloud technologies.Technologies: Scala, Ruby, Finatra, Lift, MySQL, MongoDB, Redis, AWS, Docker.

Oakland, Ca, Us

At Pandora, I held the position of Senior Data Engineer in Analytics. My work was primarily focused on Data Engineering using Hive, Python, and Hadoop. I managed a data warehouse of approximately 6 petabytes, spread across ~300 HDFS nodes, and it was expanding rapidly.My responsibilities included researching ways to enhance cluster performance on legacy technologies, developing ETL and reporting jobs, and tuning performance to meet SLAs. I also worked on various projects, including ad tracking integration, device event logging, and general system enhancements across the stack.Technologies: Java 1.5, Python, Hadoop, Hive, HQL, Postgres, Javascript.

Waltham, Ma, Us

As a Senior Software Engineer at Constant Contact, I was a key contributor to the server-side development of the Social Campaigns product launched in early 2012. I was part of a dynamic team, working on full lifecycle software development within a distributed, service-oriented architecture.My primary projects involved leveraging the Facebook API, developing REST services, integrating SOA, and managing the campaign scheduler. Technologies: Java 1.5, REST, JBoss, ActiveMQ, Spring, and MySQL to deliver robust and efficient solutions.

Waiblingen, Bw, De

In my role as a Senior Software Developer at Bosch Healthcare Solutions, I initially focused on integrating legacy systems using the HL7 protocol and developed extensive testing and simulation tools. A significant project involved integrating messaging for the VA hospital system, utilizing Oracle databases and custom queueing applications.In the subsequent three years, I transitioned to developing a new web application based on J2EE. I also worked on localization projects for US English, UK English, and German, and performed bug fixing and enhancements across various layers of the stack.Technologies: Java, Oracle, Glassfish J2EE container, SOAP, Spring, JSP, and Wicket web framework.

Menlo Park, California, Us

As a Senior Server Engineer at RedSeal, Inc., I was primarily involved in system integration projects on a Linux-based network appliance. My responsibilities included working on the data access layer and developing protocol adapters for Cisco router integration.Technologies: Java 1.4, C, MySQL, Spring, Hibernate, and EJBs.

Us

As a Senior Software Engineer at Digeo, I played a pivotal role in developing an integration platform for delivering Video-on-Demand (VOD) functionality for the Moxi digital cable box, a Linux-based appliance. My key contributions included working on XML-RPC protocols and service endpoints, with a focus on the movie selection menu and purchasing workflow. I successfully delivered simple yet effective solutions amidst complex service interactions and was instrumental in deploying initial services at digital cable headends.Technologies: Java 1.4, low-level threading, Apache Tomcat, and other XML libraries.

Us

Technical Founder and Lead Developer Silicon Valley Startup Employee #11Embarked on an exciting journey as a technical founder in a Silicon Valley startup, where I spearheaded the development of the Sentry real-time server appliance. This innovative product was designed to perform event processing and filtering, maintaining high software quality and performance on a minimal Linux-based server appliance (single core 800Mhz). Over the course of the product’s lifetime, I implemented numerous enhancements and fixes, contributing to over 10,000 successful server appliance installations.Technologies: Java 1.3, C, low-level threading, sockets, and a pattern matching engine for filtering high-traffic security logs.

As an integral member of the technical founding team at SocialNet, I was instrumental in shaping the company’s three-pronged focus: romantic dating, roommate finding, and professional networking. My role as a network and systems administrator involved establishing the development and production environments on Sun Enterprise Servers (E450 and others), utilizing colocated physical servers.I implemented a software stack based on early J2EE technologies (servlet containers, JSP, JDBC) and administered the Oracle server, for which I earned an Oracle DBA certification. My contributions significantly influenced the professional networking side of SocialNet, which served as the foundation for the platform now known as LinkedIn.Technologies: Java, Servlets, JSP, JDBC, Oracle database, Sun Enterprise Servers, Solaris, Cisco Routers.