Sergio Miziara

Solutions Architect @Plan A

🔥 Startup Founder✔️ IT💼 C-level Executive🧑‍🔬 Engineer🧨 Consulting🏦 FinanceSystem ArchitectBackend DeveloperFrontend DeveloperSystem AnalystDevOpsProduct ManagerProject ManagerWeb DeveloperSecurity AnalystSolution IntegratorComputer engineerCTOAdvisorProduct ConsultantDatabase Developer

With over 20 years of experience in technology, I specialize in architecting and delivering high-impact solutions across fintech and various industries. My expertise is in solving real-world challenges and transforming them into scalable, efficient, and innovative solutions that drive business success. Core Strengths: 💼 Tech Leadership: Proven experience leading architecture and development in mission-critical environments, especially in fintech. I ensure that every solution is innovative and sustainable. 🔧 Systems Architecture & Engineering: Extensive experience designing, building, and optimizing systems architecture, focusing on high-performance, mission-critical environments. 🚀 Diverse Tech Stack: - Languages & Frameworks: C#/.NET/ASP.NET (18+ years), SharePoint (15+ years), Node.js (12+ years), React (6+ years), PHP (18+ years). - Databases: SQL Server (18+ years, including cluster setup, tuning, and maintenance), PostgreSQL (11+ years), MongoDB (8+ years). - Message Brokers & Streaming Platforms: RabbitMQ (8+ years), NATS (4+ years), Redis (9+ years), Kafka (4+ years). - Infrastructure Expertise: Extensive work with Azure, AWS, Google Cloud, as well as private cloud solutions using Hyper-V, Proxmox and OpenStack. Containers with Kubernetes / Rancher. CI/CD with Github Actions, Argo CD / Flux 📊 Cost-Effective Cloud Migrations: Led dozens of cloud-to-bare-metal migrations, reducing costs while improving performance and reliability. 🔗 Web3 & Blockchain Integration: Proficient in DApps development, blockchain integration, and wallet connectivity. ⚙️ Low-Code/No-Code Solutions: Expertise in Node-RED and N8N for rapid deployment. Built enterprise-grade connectors for financial and mission-critical solutions. Key Experience: * +20 years of product architecture and development experience. * Extensive work in infrastructure planning, security hardening, and monitoring, including multi-cloud, high-availability setups for mission-critical applications. * Proven ability to lead cloud-native solutions and pri

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Work Background

Plan A TechnologiesSolutions Architect

Feb. 2024

FastcashEngineering Council Member (Shareholder)

Nov. 2021São Paulo, São Paulo, BrazilAs a member of the Engineering Council i advise and guide the technology decisions of the company.

INSANETechnology Advisor

Nov. 2021São Paulo, Brazil

ELLEVECTO

Jul. 2022 - Feb. 2024São Paulo, São Paulo, BrazilAs the CTO at Elleve, I spearheaded the establishment of the entire technology division, overseeing the creation of the office's physical infrastructure, personnel recruitment, and the formation of specialized squads for product development. In this role, I also served as the chief architect for the company's student loans products. Key Achievements: Product Conception and Technical Architecture: Led the conceptualization and architectural design of innovative products, playing a crucial role in transforming ideas into tangible technological solutions. Technology Infrastructure: Pioneered the setup and management of technology infrastructure on diverse platforms, including AWS, GCP, and later transitioning to Baremetal on Hivelocity. DevOps Leadership: As the designated DevOps professional, I orchestrated the end-to-end infrastructure deployment, ensuring optimal performance and scalability. Product Development Technologies: Led the development of the credit product for students (hands-on, always!), utilizing cutting-edge technologies such as .Net Core (C#), Node.JS (TypeScript), React, NATS,Postgres, Redis, and NodeRed (Low-Code). CI/CD Implementation: Implemented robust CI/CD pipelines using Github Actions and ArgoCD, facilitating seamless deployments on Kubernetes. Security and Secrets Management: Implemented mandatory security trainings for all collaborators using KnowBe4 plataform, WAF with Cloudflare and secrets management using Hashicorp Vault. Monitoring and Logging: Established comprehensive monitoring and logging systems using Grafana, Prometheus, and SigNoz for tracing. In this capacity, I played a pivotal role in steering Elleve towards technological excellence, contributing significantly to the successful development and deployment of innovative products.

BairesDevSenior FullStack Engineer

Nov. 2021 - Feb. 2023Development of systems for a few different customers of BairesDev, including: - Distributed Low-Code Saas plataform using with NodeJs, MongoDb, RabbitMQ, Redis and React. - Developers SDKs for multiple NFT contracts for the Ethereum network, using Typescript, Metamask,Ethers.js and also a few APIs using NodeJs with Fastify, Json-Rpc and DynamoDb. - Development of proprietary systems with C#, ASP.net Core, SQL Server and Sybase.

INSANEHead Of Information Technology

Jun. 2018 - Nov. 2021São Paulo Area, BrazilJoined this wonderful team to help build the "Brazilian first" sandbox MMORPG, Profane (https://profanemmo.com). Working directly with the CTO, helped to address all IT needs of the company and the game, from infrastructure to development. Responsible for IT acquisitions, negotiation with distributors, licensing deals, service providers management, high-end desktops assemble and maintenance, automation of OS and software deployments etc. Also started the Information Security area to protect company assets, information and personnel. In our current office, rebuilt the internal company infrastructure, acquiring, upgrading and installing new servers, equipments and implemented ITSM/ITAM system and processes. For our expansion on a new headquarters, planned and executed the new infrastructure with the installation of new servers, 10Gb end-to-end network, high performance wireless network, security (both physical and virtual, cameras, bio-metric access control etc) and Voip system. Helped Marketing area to address their technology needs, developing new websites, blogs, eCrm integration, campaign tools etc. Responsible for the game servers, database and related applications. Technologies used: Node.js, TypeScript, React, C#, .Net, .Net Core, PHP, Unity3d, Orleans, MongoDb, Postgres, Jenkins, Jira, Confluence, Bitbucket, Wordpress, Parse Platform, Site24x7, Spiceworks, GLPI Cloud providers used: AWS, Google Cloud and Microsoft Azure

FastcashCo-Founder & Lead Architect

Apr. 2012 - Nov. 2021São Paulo Area, BrazilFastcash was born as a brazillian fintech startup, now it's a top company in cash payments and services. I am responsible for the architecture and development with a team of several engineers, of a massive high performance ecosystem to process payments from several clients globally. The company focus at the bottom of pyramid, enabling customers to receive and send cash with lowest cost possible. I also have built and maintain the private cloud structure that hosts the entire system, in multiple connected datacenters. Technologies used: C#, .Net 4.8, .Net Core, ASP.net, Node.js, TypeScript, StencilJS, React, Ionic, NATS, Redis, SQL Server 2019, Reporting Services, MongoDb and LowCode tools.

Self-EmployedTechnology Specialist

Jan. 2008 - Dec. 2019São Paulo Area, BrazilOver the years, i helped several companies to address their technology needs as an external advisor/developer. Some projects from the latest 3 years (2016-2019): Tickethub: Rebuilt the infrastructure, reducing costs by negotiating with providers, planning, setup and migration from local DCs to cloud (IBM Softlayer, Azure and RackSpace). Development of mobile apps for ticket selling using Ionic and .Net, with offline Synchronization using poucdb e couchdb. Development of several systems and apps for their customers in Brazil, major soccer teams, like fidelity management apps, physical access control into the stadiums, ticket selling etc. NuFarm: Development of a native application for their collaborators, to consult their finance and benefits information, using Xamarin C#. TracyLocke: Development and maintenance of their main system, that controls all the agency operation, using ASP.net MVC and Azure services. Development of apps for their customers, like the app "Mestre Cervejeiro" for Heineken. Tecnologies used: Node.Js, .Net, .Net Core, PHP, React, React Native, AngularJs, Wordpress, TypeScript, RabbitMQ, Akka.net, CouchDb, MongoDb, Azure DocumentDB/CosmoDb, Reporting Services 2014/2016, Klipfolio, Xamarin, Cordova (Ionic and Phonegap), ElasticSearch/LogStash/Kibana, OneSignal, CouchDb and others. Cloud/Servers providers used: Azure, AWS, Google Cloud (and Firebase), Softlayer, RackSpace, OVH, Ionos, Hivelocity.

inCast - Conecta Talentos e Equipe de Produção com Oportunidades de TrabalhoCTO

Nov. 2015 - May. 2019São Paulo Area, BrazilInCast is a startup building a marketplace platform for entertainment professionals and companies. Joined the team to plan, design, architect and develop the new platform. Also built and maintain the entire infrastructure on Azure. Technologies used: C#, .Net 4.6, ASP.net MVC, React, Redis, SQL Server 2016/SQL Azure.

ABBSharepoint Specialist /.Net Architect

Jul. 2013 - Sep. 2015Osasco, São Paulo, BrazilResponsible for the migration of Lotus Notes application to SharePoint 2013, Office 365 or .Net (with a team of other 3 developers). Developed tools to help the data migration for the new platforms. Integration of SAP processes and other ERP tools with .Net applications. Created an N-Layer architecture with .Net 4.5, featuring automatic and adaptive code generation, including frontend pages with Bootstrap, to standardize and accelerate the development process

Deal TechnologiesSenior .Net Developer

Mar. 2012 - May. 2012São Paulo Area, Brazil

BDS - Soluções e InformaçõesSenior .Net Developer

Nov. 2010 - Mar. 2012São Paulo Area, BrazilResponsible for the development of trading systems, and APIs to consult historical data of investment funds. Applications developed: - Banking systems to calculate risk curves in use by Rabobank and Hsbc Bank. - Messaging system to quickly send quotes from funds and stocks - Excel Add-in to query all historical data in functions and sheets. Technologies used: C#, .Net 4.0, ExtJS, SQL Server

K2Senior .Net Developer/Sharepoint Consultant

Jul. 2010 - Nov. 2010São Paulo Area, BrazilAt this timely project, I was responsible for the development and implementation of SharePoint 2007 customizations and features, with integration to Dynamics CRM and Dynamics AX.

ILangSenior ASP.net Developer

May. 2010 - Jul. 2010São Paulo Area, BrazilAt this timely project, I helped with the architecture and development of a SaaS system for universities and schools create distance learning courses. Technologies used: C#, .Net 4.0, WCF, Velocity (now AppFabric), JavaScript with Mootools.

DEDIC-GPTISenior .Net Developer

Jan. 2010 - Apr. 2010São Paulo Area, BrazilResponsible for the development of banking systems integrated with Mainframe (Cobol). Technologies used: C#, .Net 3.5, ASP.net MVP.

TDS EnterpriseSenior .Net Developer

Aug. 2009 - Dec. 2009São Paulo Area, BrazilResponsible for the development of several projects in a software factory manner. Main projects: - Inventory control application (VB.net, SQL Server) - Online communication (video and voice) application (Adobe Flex 3.0 and C# 3.0) - SharePoint webparts and features (SharePoint 2007, C#)

Spring WirelessProduct Developer

Jun. 2008 - Aug. 2009São Paulo Area, BrazilResponsible for the project of a new administration portal, for the entire field devices database. I also developed a full library of ASP.net controls to improve the performance and user experience over other tested libraries (DevExpress and Telerik). Using this library, I built a new Report Viewer control, to provide a better usability and responsiveness.

Bolsa de Valores de São Paulo - Bovespa.Net Developer

Jan. 2008 - Jun. 2008São Paulo Area, BrazilAt this timely project I was responsible for the development internal systems and a Social public portal. Technologies used: C#, ASP.net, VB.net, .Net 1.1/2.0, Microsoft Commerce Server 2002, SQL 2000.

Inovazinia.Net Developer

Oct. 2006 - Jan. 2008São Paulo Area, BrazilResponsible for the development of internal banking systems, like Human Resources, Treasury, Investments and SWIFT operations. Technologies used: C#, VB.net, ASP.net, Javascript, IBM Websphere MQ, SQL Server 2005, Reporting Services.

FreelancerFreelancer Developer

Jan. 2003 - Oct. 2006São Paulo Area, BrazilAs a freelance developer I created many sites, e-commerces integrated with PayPal and E-Gold, general applications and libraries, for local clients at Santos/São Paulo and remote clients in Brazil and other countries. Also contributed to an open-source massive online gaming server in C# (Ultima Online/RunUO). Main technologies used: PHP, MySQL, ASP, Access, C#, ASP.net, SQL Server 2000