Daniel (Maqueda) Martinez Maqueda
Founding Database Engineer
Experience
Founding Database Engineer
tonbo.io
Working on the next iteration of tonbo to make it the most flexible in-process analytical database in the market that scales and is operated with strong availability
Introduced object scope cache to the remote storage layer to avoid I/O churn
Working on refactoring WAL to support remote storage
Taking care of the health of the systems as well as designing the operational story and bringing them to production
Technologies: LSM, WAL, Arrow, Parquet, Rust
Tech Lead
super.ai
Tech lead of the backend team of 6 to deliver the new flows storage and messaging product
Designed authentication and all backend flows and systems
Built the websocket to power the table view (flows real-time updates) in a serverless architecture
Led to signing two new customers
Responsibilities: design, documentation, refinement, delivery
Technologies: AWS/GCP, Python (backend), Supabase
Tech Lead
Trade Republic
Tech lead of the Customer Platform team driving execution of multi-accounts and local branches
Delivered local branch migration to move customers from non-German jurisdictions to new legal local branches, first jurisdiction France, migrating 800k customers successfully
Led 6 other teams plus a team of 15 cross-functional engineers (mobile, web, backend)
Responsibilities: design, documentation, refinement, delivery
Technologies: AWS, Java, Kotlin, Kubernetes, Kafka, RabbitMQ
Software Development Engineer
Amazon Web Services
Designed and delivered a service to enable instance attestation for AMD SEV-SNP hardware encryption in EC2 Enclaves
Mentored two engineers in a team of three
Maintained the Rust client
Responsibilities: design, documentation, refinement, delivery
Technologies: AWS (Lambda, SQS, S3, DDB), Java (backend), Rust
Rust Database Engineer
SAP
Worked on SIGNAL, a custom process mining query engine with an SQL-like query language written in Rust
Enhanced scalability and implemented new operators (joins)
Technologies: Rust, Apache Arrow, Apache Parquet, AWS services
Software Development Engineer
Amazon Web Services
AWS Billing
Metering: developed microservices to meter the usage of service teams
Pricing: maintained four pricing systems, focusing on deprecating the old relational database
Discounts: designed, developed, and delivered a service to automate discounts (starting with EDPs)
Collaborated with Product, Management, and Customers to define the product from inception
Mentored junior developers in a team of 8–10
Responsibilities: design, documentation, refinement, delivery
Technologies: AWS (Lambda, SQS, S3, DDB), Java, Kotlin, Scala
Software Developer
SAP-Datango
Developed a one-page cross-browser web application in JavaScript, HTML, and CSS with JSON data exchange
Built a cross-browser rich text editor in JavaScript
Developed and maintained an MVC and component JavaScript framework to handle cross-browser issues
Technologies: JavaScript, CSS, HTML
Full-Stack Developer
HERE Maps
Full-stack JavaScript developer in the Connected Driving space
Collected, transformed, and presented internal data sources to drive decisions
Technologies: Node.js, Angular, PostgreSQL
Software Developer
SAP-Datango
Developed a one-page cross-browser web application in JavaScript, HTML, and CSS with JSON data exchange
Built a cross-browser rich text editor in JavaScript
Developed and maintained an MVC and component JavaScript framework to handle cross-browser issues
Technologies: JavaScript, CSS, HTML
Various
Various
R&D Engineer for Indra and Telefónica, managing R&D projects for 3 years
Full-stack developer with Java on the backend for 1 year
Test Engineer at Telefónica for 1 year
Technologies: Java, Android, JavaScript, CSS, HTML
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Information Technology (22 years), Telecommunication (22 years), Banking and Finance (1.5 years), and Automotive (1.5 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Information Technology (22 years), Product Development (22 years), Project Management (22 years), Quality Assurance (22 years), Research and Development (22 years), and Business Intelligence (1.5 years).
Summary
I am a Software Development Engineer with close to 20 years of experience, the most significant as a backend developer working with distributed systems at scale and database internals.
Skills
- Distributed Systems With Multiple Components Working Together At Scale
- Database Internals Developing An In-memory Columnar Database
- Systems Design Of Microservices That Scale And Are Operated With Strong Availability Requirements
- Operations Taking Care Of The Health Of The Systems As Well As Designing The Operational Story And Bringing Them To Production
- Aws Knowledge Of Computing, Storage And Messaging Systems (With Emphasis On Serverless)
Languages
Education
UNED
Philosophy · Madrid, Spain
Universidad Complutense
Diploma in Software Engineering, focus on Artificial Intelligence (Neural Networks) · Software Engineering · Madrid, Spain
Profile
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