Diego Martínez Castañeda
Senior SRE at Flywire

Work Experience

March 2023 – Present
Senior Site Reliability Engineer
March 2022 – February 2023
SRE Manager
Managing a small SRE team means that I split my time between managing and engineering tasks. As a manager I have to improve our overall services, keep AWS costs at bay, design and prepare our infrastructure for future business requeriments, enhance our security posture and work closely with product teams. As engineer I work with my teammates to put in place tools for development and product teams, ensure the scalability, reliability and availability of our services, provide the correct monitoring of our infrastructure and CI/CD cycle.
March 2021 – March 2022
Senior Site Realibity Engineer
As the first SRE of the company I had one primary goal: prepare and secure the infrastructure and its services for a daily use in a big data startup. During the first months I redefined how we access, use and deploy apps in our AWS cloud, its security and unified roles, accounts and services. After stabilizing and building the main pillars of the infrastructure, the SRE team worked on multiple fronts to bring stability, security and make the work for all the people in Inspide easier paying special attention to security, scalability, monitoring and cost control.
EUIGS | Admiral Group
January 2020 – February 2021
Solutions Architect
My job as a cloud Solutions Architect implies seeking, designing and explaining global solutions for a multi account environment in AWS (+90 accounts). These solutions are related with basic services or infrastructure like communication, connectivity, backup or DNS and they impact on several accounts, if not all of them. This transversal solutions are made with AWS Best Practices and security guidelines in mind. During the COVID-19 confinement my team moved 1200 people to AWS public cloud in just two weeks following all security regulations.
EUIGS - Admiral Group
Sevilla Area, Spain
April 2018 – January 2020
Security Cloud Engineer
I've worked as Cloud Senior System Administrator focused on infrastructure, with connectivity and security in mind. Among my tasks are core services, direct connect lines and multi-account deployments, all on AWS. Working entirely in AWS, I was using several services from the platform and making an extensive use of Infrastructure as code (Iac, CloudFormation) in a multi-account environment. Also, I was designing and implementing some of the core services to be run across the organization, like full connectivity framework (Direct Connect, VPN, VPC peering) or internal domain name service (DNS).
Solutia Innovaworld Technologies
Sevilla Area, Spain
August 2016 – April 2018
DevOps Engineer
Systems technical specialist, I also did programming tasks in several languages (bash, python, ruby) and get in charge of everything related with systems layer in development department. I managed the servers in the department, too.
Asociación Andaluza Instituto de Formación Teatral : IN-FORTE ATOPIA
Sevilla, Spain
October 2017 – December 2017
Production Assistant
My work in Inforte Atopia was related with providing some of the elements that will be for the representation of "Móviles". Also, I did the audiovisual work on stage.
Las Rozas De Madrid Area, Spain
June 2013 – February 2016
System Engineer Manager - Fully remote
My job was about managing systems and developing the appliance platform in Research and Developing (R&D) Department. My tasks were support and evolve the appliance Operating System (Debian GNU/Linux), integrate third party programs and platforms (Zimbra, Active Directory, SQL Server, etc...), projects managing and pre-sales. In WhiteBearSolutions I've specialized in IDM and backup solutions. I also developed the new website, based on Wordpress and integrated with Customer and Partners portals. Although WBS is based in Madrid, I did telecommute work from Mérida (Spain) using company and clients infrastructures.
OSS Senior System Engineer Executive
Development of SESLinEX (LinGobEX Salud), a linux based distribution for Health Care system in Extremadura, Spain I lead a team of 3 for developing a thin-client computer, based on Debian GNU/Linux, that works in Extremadura's Health System infrastructure. Currently we're managing +10,000 computers and serving to +25,000 users (doctor, nurses, etc.). It has to integrate with server applications like SAP, directory services like Active Directory and LDAP, and storage services like CIFS and NFS and it's all based in open source software. - Design of the project roadmap - Definition of the tasks and timetables - Management of a five people team - Developement of linux software packages
March 2011 – March 2011
Training video about «Todo LibreOffice»
March 2008 – March 2008
Training video about «Trabajo en Linux»
June 2003 – December 2003
Linux Senior Systems Engineering and Project Manager
I worked as a Linux Administrator, managing and tuning Linux servers in a small ISP company. In addition to this, I was responsible for assigning duties to the other team members and providing then with guidance. We developed version number seven of extremadura.com, the largest portal in Extremadura (Spain).
Fundacion CTIC
June 2000 – June 2003
Technical Manager and System Administrator
My role at Centro SAT in Ciudad Tecnológica de Valnalón included managing a heterogeneous network of Linux, Windows and Mac OS X based systems, developing web pages and setting up VoIP and video conference systems. I was responsible for network security. I did some speeches about technology and IT services and developed some consultant skills.
February 1999 – February 2000
I worked as a technician in CEPSA, administering UNIX servers for a year and teaching users in computer and software use.




  • 1996 2001

    Universidad de Oviedo

    Computer Science

  • 2014 2015

    Universidad de Extremadura

    Master’s Degree

    English Language

    Grade: C1

  • 2005 2012

    Escuela Oficial de Idiomas de Mérida

    English Language

    English Literature (British and Commonwealth)

    Grade: B2


Amazon Web Services (AWS)
AWS Security
Virtual Private Network (VPN)
Amazon EKS
AWS Identity and Access Management (AWS IAM)
Docker Products
Multiprotocol Label Switching (MPLS)
Network Infrastructure
Python (Programming Language)
Team Management
Private Clouds
communication skills
Network Security
Written Communication
Analytical Skills
AWS CloudFormation
Agile Methodologies
Secure Shell (SSH)
Server Architecture
Cloud Computing
Amazon VPC
Linux System Administration


Diego es el ejemplo perfecto de dedicación, sabiduría y perfección en el trabajo. Diego me enseñó algo muy importante a nivel profesional: conocer disciplinas asociadas a la propia con el fin de que la comunicación e integración en un equipo sea lo más fuerte posible. Si tuviese que elegir entre todos los Administradores de Sistemas que conozco, sin duda Diego sería el primero de la lista.