Principal Software Engineer
Resume:
Randall Vargas Li
San José, Costa Rica Phone: +506-****-****
********@*****.***
Resume:
Name: Randall Vargas Li
Birthplace: San José, Costa Rica
Address in Costa Rica: Escazú, Costa Rica, 10203
Professional Summary
Software Engineer with over 21 years of experience in application development, software architecture, and enterprise solutions. Specialized in Microsoft technologies (.NET, C#, SQL Server) and modern architectures such as microservices, Azure, Docker, and DevOps. Proven track record in global projects and high-impact companies, serving as a technical leader and principal software engineer. Extensive experience in freelancing and consulting, collaborating with clients across the U.S., Europe, and Latin America, delivering scalable and high-performance solutions. Passionate about innovation, continuous learning, and artificial intelligence, currently pursuing an MSc in AI/ML.
Professional Experience
06.2024 – 12.2024 FuxionMix.com (Personal project)
Owner, creator.
Sqlserver, c#, mvc, .net core, js, jquery
Azure Chatgtp-4 text, azure tts. Narakeet tts.
10.2021 – 06.2024 Principal Software Engineer (Publicis Groupe, CR)
Technical leader, Principal Software engineer
UPS contingency failover system, firebase, c#, json
rOar ETL for SSAS, cosmosDB, Azure datafactory, sqlserver
ServiceNow production L3/L4 engineer.
05.2021 – 10.2021 Senior Software Engineer (3pillar Global, Costa Rica)
Fullstack senior software engineer with a strong focus on backend
04. 2020 – 01.2021 Senior Software Engineer (Garino.com.uy, Uruguay)
9 month project. As a private contractor.
API backend first design from scratch
.Net core 3.1, EF, Web API, Swagger, sqlserver, rebex mailer
Docker containers, Docker-Compose. Telerik JustMocks.
Microservices Architecture, multiple software design patterns 06. 2019 – 03.2020 Senior Software Engineer (Dee.ie, Ireland, EU)
9 month project. As a private contractor.
Backoffice development. API Backend Development
01. 2019 – 06.2019 Senior Software Engineer (InnRoad.com, NY, USA)
6 month project. As a private contractor
GDPR anonymizer backend developer using Restful WebAPI
Core Mailer with AWS SQS/SES/SNS
Unit tests / QA / TDD
HomeAway.com Integration w/WebAPI .NET
Randall Vargas Li
San José, Costa Rica Phone: +506-****-****
********@*****.***
01. 2017 – 01.2019 Senior Software Engineer Quarksoft.com (Quarksoft LLc, New York, USA)
WPF, WCF, WebAPI, .Net, soap/restful
WinForms, C#, VB/VBA
WebForms & MVC.NET, Javascript, jQuery, CSS3, HTML5 05. 2014 – 08. 2016 Senior Software Engineer – GpsSatelite.com (Geos Telecom S.A., SJ CR)
Windows Phone Apps, Android Apps
Webservice, Database and Backoffice frontend
.Net technologies, c#, java, Netbeans, Eclipse, QA 01. 2013 – 03. 2014 Mid Software Developer – Bond-Pro.Com (Bond-Pro Enterprises, FL, USA)
Legal Bond issuing Software
WinForms / C# / WebForms / HTML5/JS/CSS3
01. 2010 – 01. 2012 Software Lead Project (World Internet Solutions S.A. (WINS), San Jose Costa Rica) – Promotion/Rehire
Poker Server / Poker Network server & client for Linux w/java
Development/modify interface for POK3d client
06. 2007 – 01. 2010 IT Consultant (World Internet Solutions S.A. (WINS), San Jose, Costa Rica)
Custom software development
Hardware & Software support for windows servers
Online Casino games development
01. 1999 – 01. 2006 Consultant Software Development and Technical Support Services
(Servicios Médicos y Constructivos S.A., San jose, Costa Rica)
Medical trials control custom software in-house development
WinForms / SQL server / Networking and general support 01. 2011 – 01.2019 Certified instructor (New Horizons Computer Learning Centers, San Jose, Costa Rica), Cenfotec University and Elev8me.Com
As a private contractor. Instructor part-time or at nights.
Mentored learning, Android teaching, .Net teaching 01. 1999 – 01.2003 IT support, Programming (Intelisoft S.A., San Jose CR)
Custom software development
Hardware & Software repair & support
Freelancing projects (local, freelancer.com / upwork.com) 01.2024 – 05.2024 Freelancing Project (PhoneIQ.Co)
Docker microservices, c#, sqlserver,
HotTowel (durandal, knockoutJS, breeze)
Salesforce API, twilio/sendgrid api, other 3rd party libraries
Kamailio SIP server, kazoo, servers infrastructure. 05.2023 – 08.2023 Freelancing Project (Zaleos engineering (zaleos.net), Spain)
Kamailio SIP – ISUP7 translation from C++ to C# succesfully
Created small Blazor website for intranet use.
Randall Vargas Li
San José, Costa Rica Phone: +506-****-****
********@*****.***
05.2023 – 08.2023 Freelancing Project (BDCF llc (bdfc.net), US)
SMG software maintenance.
ADHOC tasks.
06.2023 – 08.2023 Freelancing Project (Brickriver llc (gcfa.org), US)
Multiple fixes and new features.
Implemented a new way to upload questionnaires and it improved processing speed 600% faster
05.2023 – 06.2023 Freelancing Project (ZeMobile (darsedebaja.com), Spain)
Create automated PDF template completion based on email variables sent from WordPress website.
03.2022 – 03.2023 Freelancing Project (TechTop Industries, Atlanta, GA, US)
Local machines to Azure Infrastructure migration
Zoho assist configuration for local and VM PCs
Techtopind.com whole website migration and maintenance 11.2021 – 11.2022 Freelancing Project (FABMation.De – Bosch Und Hausgerate, Germany)
Factories & production lines software maintenance 06.2021 – 09.2021 Freelancing Project (Geroma Software (serviarchivo) Fundación UCR para la investigación, Costa Rica)
University of Costa Rica investigation foundation custom software multiple users/files digital signature processing
WebAPI, sqlserver, SPs
C#, Visual Studio, TFS
03.2021 – 06.2021 Freelancing Project (http://vizulocity.com, USA)
PicassoDK Powerpoint addin
c#, vsto
Outgoing maintenance
05.2020 – 06.2020 Freelancing Project (Acehealth.co, Dublin, Ireland)
Jitsi video implementation using ubuntu linux
03.2020 – 04.2020 Freelancing Project (Comunidades.cr, San José, Costa Rica)
Jitsi video implementation using ubuntu linux
Cmail.cr – hmail email server with roundcube webmail
comunidades.cr central admin for email, private social network and private email cmail.cr and private videoconferencing app 08. 2019 – 02. 2020 Freelancing Project (Bis.co.cr, San José, Costa Rica)
Software created from scratch named SIGAP –
Merchants/distribution system (part backend/frontend.)
.Net telerik, KendoJS, KendoUI
.Net bootstrap, .net core 2.2
Randall Vargas Li
San José, Costa Rica Phone: +506-****-****
********@*****.***
08. 2018 – 12. 2018 Freelancing Project (MiBus, San Jose, Costa Rica)
MiBus Android App, auto checkin w/cardID for autobus
C# WebForms, firebase api, barcode pdf417
Android Studio, Java
11. 2017 – 04. 2018 Freelancing Project (VGS Systems, NY, USA)
Sales kiosks software, remote management.
WCF, WPF, WebAPI, WinForms, WebForms & MVC.NET
01. 2017 – 01. 2018 Freelancing (Intellivest CO, Chicago, USA)
Several wordpress tasks
04. 2017 – 12. 2017 Freelancing Project (Lehigh Valley Security Shoes, PA, USA)
POS SYSTEM with sync
Remote sync (WPF / C# / SQLserver 2016)
06. 2017 – 11. 2017 Freelancing Project (Shnit worldwide shortfilm festival, San Jose Costa Rica)
iOS, Android App in named Shnit worldwide shortfilm festival
Xamarin Forms
03. 2015 – 11. 2015 Freelancing Project (INSurance Services, San Jose Costa Rica)
Android App in store named INS 24/7
In road services backend, frontend and mobile app
Eclipse, Java, QA
02. 2014 – 07. 2015 Freelancing Project (COSEVI (Government Institution), San Jose Costa Rica)
Geolocation application to save vehicle collisions ubications
.Net, google apis, google maps, leaflet api, javascript, jQuery 06. 2010 – 04. 2011 Freelancing Project (Valle del Sol Golf Course, Santa Ana)
Fingerprint control Software to automatically dispense golf balls
Building a serial COM port module
DTR signal custom module / basic electronics
08. 2001 – 06. 2002 Freelancing Project (APA World Wide Moving, San Jose, CR)
Custom Software to fill out the moving forms
Studies
Present - 2027 MSc. in AI/ML - https://www.iubh-international.com – University of Applied Sciences, Germany.
2017 Licentiate degree in Software enginneering, development emphasis (Universidad Latina de Costa Rica)
2010 BSc degree in Systems enginneering (Universidad Latina de Costa Rica)
Other Qualifications
Certificates and Courses Laserfiche Certified, CompTIA Certified (A+, N+, Green IT, Server, Cloud), MOC Windows Server 2008 R2 MOC 6419 & 6420 (windows server 2008), 6425 AD DS, EC-COUNCIL Certified Ethical Hacker, Randall Vargas Li
San José, Costa Rica Phone: +506-****-****
********@*****.***
MOC 2778(Querying SQL Server 2008), MOC 6232, 6233
(Implementing, maintaining SQL Server 2008 R2), MOC 6234, 6235, 6236 (Microsoft SSAS, SSIS, SSRS), MOC 20480, 20486, 20487 Given Courses ANDROID Basic & Intermediate, MVC .NET – FiServ, SysDe, ICE CompTIA A+ & N+, MOC 20480 - Programming in html5 and css3 w/javascript
IT-Skills
• Git, GitHub, Plesk, Swagger, Dapper, Jira, Bitbucket, slack, Unit tests, QA
• .NET, ASP.net, JAVA, JavaScript, JQuery, CSS3, XML, JSON, SQL, EF ORM
• WPF, WCF, IIS, WebForms, Winforms, MVC, WebAPI, LINQ, .net Core
• Docker containers, docker-compose, jitsi meet, ubuntu linux, windows server
• IOS, Android, Google API, Paypal API. Firebase, biometrics, vsto, microservices
• Azure (ChatGPT-4 text, TTS, Data Factory, CosmosDB), ServiceNow, Firebase, SSAS, SSIS, SSRS, SOAP/RESTful APIs, JSON, OAuth, SAML, SSO, LDAP.
• SQL Server (T-SQL, Stored Procedures, Triggers), PostgreSQL, MySQL, NoSQL
(CosmosDB, Firebase), Database Optimization, Query Performance Tuning.
• Docker microservices, Kamailio SIP server, Kazoo, VoIP, WebRTC, Twilio API, SendGrid API, Salesforce API, HotTowel (Durandal, KnockoutJS, Breeze).
• Telerik JustMock, Kendo UI, Infragistics, Bootstrap, Razor Pages, Telerik Reporting, Blazor (basic), Android Studio, Java, Eclipse, NetBeans, Xamarin Forms.
• Cybersecurity (EC-Council CEH), Windows Server Administration, Network Administration, VPNs, Digital Signatures, SSL/TLS, Active Directory, TFS, SVN. Profiles
• Linkedin: http://www.LinkedIn.com/in/ranvli
• Github: http://www.github.com/ranvli
• Bitbucket: https://bitbucket.org/ranvli
Languages
• Spanish: Native
• English: B2 – North-american cultural center in Costa Rica
• German: A1 – Goethe-Institut Costa Rica (In progress) Motivation
• Seeking challenging tasks that involve responsibility and problem-solving.
• Passionate about self-development, continuous learning, and staying ahead in technology.
• Driven by innovation and the opportunity to implement new ideas.
• Comfortable working both independently and as part of a team.
• Motivated by projects that offer growth opportunities and meaningful impact. Business references
• Holger André, Principal Software Engineer at Publicis Groupe, +506-****-****
• Rainer Broleen, CEO, Fabmation Deutschland, Email: **@*********.**
• James Muldoon, CEO, TechTop Industries, Email: ******@**********.***
• Enda Maden, VP of engineering, Acehealth Co., Dublin, Ireland. Email: ****.*****@*********.** / ****.*****@*****.***
• David Karle, VP of engineering, Vizulocity.,USA. Email: ****@**********.*** Randall Vargas Li
San José, Costa Rica Phone: +506-****-****
********@*****.***
• Fernando Benavides, VP of engineering ServiArchivo, Geroma Software., CR. Email: **********@****-**.***
• Mr. Washington Leon-Jordan, VP of engineering, InnRoad LLc, New York, USA, email: **********.****@*******.***
• Mr. David Finkelstein, CEO, Quarksoft LLc, New York, USA, email: *****@*********.***
• Mr. Jeff York, VP of Development, Bond-Pro Enterprises, Orlando, Florida, USA, email: *****@****-***.*** or +1-813-***-****
• Mr. Antonio Robinson, CEO – GEOS Telecom - *******@***********.***
• Ing. Joaquin Cubero, CEO Grupo Cruz S.A. / Intelisoft, San José, Costa Rica, email: *******@*****.*** / *******@**********.**
• Mrs. Ana Alvarado. Propietary Manager, Inmobiliaria Anali, San José, Costa Rica, +506- 8376-9659
• Dr. Iris Perez, MD, President, CEO, Semeco S.A. / +506-********
• Mrs. Karla Rodriguez, COO, New Horizons IT Learning Centers Costa Rica, **********@***********.**.** or +506-****-****
Also in http://www.Elev8me.com
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