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Marco Saraiva

@marcosaraiva

Senior Software Engineer with 20 years’ experience across backend systems, .NET, APIs, microservices, architecture and technical leadership.

United Kingdom

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What I'm looking for

Senior or Staff Software Engineer role focused on backend systems, ideally using C#/.NET, APIs, microservices and distributed systems. I’m particularly interested in fully remote, internationally distributed teams. I’m open to both established companies and strong product-focused startups, and to both fully hands-on technical projects and projects where high-level analysis is needed.

Senior Software Engineer with 20 years of experience in software development, specialising in C#/.NET backend systems, APIs, microservices and enterprise applications. Experienced in technical leadership, system design, requirements analysis, delivery planning and stakeholder engagement.

Currently working as a Senior Software Developer at Baillie Gifford, with recent experience leading a development stream and responsibilities spanning technical leadership, requirements gathering, estimation and delivery planning. Experience spans financial services, high-volume systems, mobile applications, consulting and business-critical enterprise software.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Developer

Current

Baillie Gifford

Jun 2025 - Present (1 year 4 months)

Senior backend developer working on business-critical internal systems supporting investment operations. Co-led a four-person development stream, combining hands-on development with requirements gathering, planning and delivery coordination.

C#.NET REST APIs Microservices Oracle Azure Service Bus Docker Kubernetes Azure DevOps CI CD Testing Automation Incident Response

Software Developer

Baillie Gifford

Jan 2022 - Jun 2025 (3 years 5 months)

Worked on systems supporting investment decision-making and portfolio management, including the Asset Allocation and IBOR initiatives. Designed and developed C#/.NET REST APIs within a microservices architecture.

C#.NET REST APIs Microservices Oracle Azure Service Bus Docker Kubernetes Azure DevOps CI CD Testing Automation Requirements Gathering

Software Developer

Swipii

Dec 2019 - Nov 2021 (1 year 11 months)

Software Developer within a small startup engineering team, working across mobile applications and .NET backend services. Developed Android applications using Kotlin and iOS applications using Swift.

Kotlin Swift .NET REST SQL Server app store Google Play Product Collaboration Analytics

IT Specialist

FIRJAN-SENAI

Oct 2018 - Dec 2019 (1 year 2 months)

Worked as a senior technical specialist across backend, web and Unity projects, combining hands-on development with architecture, technical leadership and client engagement. Gathered and analysed business and technical requirements and defined system architecture for new projects.

Backend Development Web Development Unity Architecture Technical Leadership Client Engagement Requirements Analysis Project Coordination Deployment User Training

Middleware Software Developer

PSafe

Oct 2016 - Oct 2018 (2 years)

Developed and maintained the company's high-volume advertising middleware platform responsible for delivering and targeting advertisements across mobile applications and recording advertising metrics. Designed and developed a geographic campaign-targeting capability, enabling advertisements to be segmented according to users' geographic location.

C#.NET Multithreading SQL Server Cassandra Advertising Middleware Performance Optimization

QA / Premier Field Engineer

Microsoft

Feb 2016 - Oct 2016 (8 months)

Consultant supporting Microsoft's Rio 2016 Olympic and Paralympic Games website project. Coordinated QA activities and communication between the Rio 2016 UAT organisation and Microsoft development and management teams.

QA UAT Smoke Testing Exploratory testing ITSM HP Quality Center Visual Studio Online Incident Management Requirements Analysis

Functional Analyst

Petrobras

Apr 2014 - Feb 2016 (1 year 10 months)

Participated in the redesign of Petrobras's internally developed Logistics and Transportation system. Contributed to the redesign of the application architecture using Domain-Driven Design and object-oriented design principles.

Domain Driven Design Object Oriented Design Requirements Analysis Functional Specifications Use Cases ABAP UI Redesign

Systems Analyst

3CON

Aug 2012 - Sep 2013 (1 year 1 month)

Developed and maintained an internal server-monitoring and performance-reporting platform using C#/.NET, Silverlight, WPF, WCF REST/SOAP services, Telerik components and Oracle.

C#.NET Silverlight WPF WCF REST SOAP Telerik Oracle

Software Developer / Systems Analyst

IS2B – Integrated Solutions to Business

Dec 2010 - Apr 2012 (1 year 4 months)

Developed and maintained the company's POS terminal platform, working with devices from Ingenico, Gertec and Verifone. Developed embedded POS software in C, integrated with SQL Server, and later trained and led two junior developers.

C Embedded Systems POS SQL Server Ingenico Gertec Verifone Team Leadership

Software Developer

PUC-Rio — Sistema de Administração Universitária

Oct 2009 - Dec 2010 (1 year 2 months)

Migrated a legacy VB6 medical school student management system to an object-oriented C#/.NET application integrated with the university's core systems. Subsequently contributed to the mobile version of the university-wide student management system.

C#.NET VB6 DB2 Migration Mobile Development

Trainee / Software Developer

Muito Fácil Arrecadações e Tecnologia

Mar 2006 - Oct 2009 (3 years 7 months)

Started as a trainee and progressed into software development, working on financial transaction systems and integrations with Brazil's banking infrastructure. Developed C#/.NET intranet applications integrated with SQL Server.

C#.NET SQL Server Financial Transactions ATM Integrations