David Jiménez Martínez
Senior Software Engineer, Python Developer
⌨️ Github - 📚 Blog - 🌐 LinkedIn
🔖 Summary
Software Engineer with +10 years of experience in the full development cycle of complex applications across a variety of fields, leading the development of software projects from inception and mentoring technical teams.
Specialised in:
- Designing and building software from the ground
- Backend development in both monolithic and distributed, event-driven systems
- Ensuring technical excellence and empowering teams to deliver high quality, maintainable solutions
👨🏭 Working experience
🖥️ DIGIT, a Scopely Studio (1 year, 8 months)
Senior Backend Developer, 2023/03 - present
Contributed to the implementation of new features for DIGIT games
Highlights:
- Developed new features for the game, ensuring performance through monitoring using Datadog and Kibana, and stress testing with Locust
- Improved code scaffolding and testing practices for greater efficiency
- Improved code quality and consistency with mypy
- Hosted technical trainings
🖥️ Inari.io (4 years 9 months)
Backend Architect, 2022/03 - 2023/03
Led the technical development, testing and packaging of new platform features and proofs of concept, delivering new content to the product suites of Inari.
Python Lead Engineer and Tech Coach, 2018/07 - 2022/03
Led and mentored a cross-functional team of five developers.
Highlights:
- Designed, built and deployed a highly scalable, distributed policy admin platform, based on CQRS+ES/Clean architecture within a microservices ecosystem, following Domain Driven Design (DDD) best practices and patterns
- Implemented a retry/DLQ framework to use with Apache Kafka, greatly improving the performance over SQS
- Eventual consistency for complex transactions achieved via choreography (event-driven) and orchestration (Taskflow)
- All functionality was exposed and secured via a GraphQL API
- Designed and implemented a library to abstract Blockchain to serve as an append-only event store
- Designed and implemented a high-performance RBAC + ABAC auth system based on pathfinding, improving the performance of existing authorisation python libraries like Casbin
- Trained and mentored junior developers to bring them up to speed
🖥️ Self-employed (5 years 4 months)
Melange, 2017/10 - 2023/01
Developer and maintainer of Melange, an open-source library aiming to ease the creation of Event-driven architectures with Python. Adopted at 21Buttons and Inari.io. Out of maintenance in favor of Kafka.
🖥️ 21Buttons (1 year)
Python Architect and Developer, 2017/07 - 2018/07
Contributed to the implementation of new features for the 21Buttons fashion social network app, and led the development of a Marketplace platform.
Highlights:
- Led the Introduction of good testing practices and DDD patterns into the project
- Improved the existing Django solution by structuring the code to follow the Hexagonal Architecture, decoupling the framework from the business logic
🖥️ Vistaprint (11 months)
.NET / C# Software Engineer, 2016/09 - 2017/08
Contributed to the maintenance of their website by developing new features to enhance SEO.
Highlights:
- Improved existing features and added new API entrypoints using .NET and .NET Core, TDD with NUnit, deployed the solution using Terraform and Docker, all hosted in AWS
🖥️ Tokiota (1 year 7 months)
Senior .NET and Javascript Engineer, 2015/01 - 2016/07
Contributed as a consultant to the development of several projects:
- An XML engine for processing employee data and generating payslips, as well as an internal administration tool in the context of a SCRUM team composed of seven members
- An e-Commerce platform to sell football subscriptions in a team of three people
Highlights:
- Implemented complex backend algorithms and designed the architecture of the project, decoupling NHibernate persistence from the business logic
- Encouraged DDD, TDD and design patterns best practices within the team
- Implemented a distributed software solution using Azure Service Fabric
🖥️ King-eClient (1 year 1 month)
.NET Lead Developer, 2014/01 - 2015/01
Contributed as a consultant to the development efforts of two projects, an e-Commerce platform for a pharma company, and a mobile application for a public transportation company.
Highlights:
- Designed and implemented the e-Commerce platform from inception using the ASP.NET technologies
- Designed and implemented the mobile application from inception using Xamarin
🖥️ Good Deal (1 year 1 month)
Associate .NET Developer, 2013/01 - 2014/01
Contributed to the development of new features for a software product targeted at retailers to deliver coupons to customers, based on their purchases and their profile, aiming to increase fidelisation and satisfaction.
🖥️ Sant Celoni Town Hall
.NET developer freelancer, 2011/06 - 2012/01
Led a technical team of three member to develop a small e-Government platform to handle several types of form applications from citizens with ASP.NET.
🖥️ Universitat Politècnica de Catalunya (1 year 8 months)
Developer intern, 2008/07 - 2010/02
Contributed to the development of new features for the educational platform Moodle. Developed frontend features with PHP, HTML and CSS.
⚙️ Technical Skills
Programming Skills
- Algorithms and problem-solving mindset
- SOLID principles
- Architectural patterns: Clean Architecture, CQRS + Event Sourcing, Event-driven, MVP
- Testing: Unit, Integration and End to End
- Programming Paradigms: Domain-Driven Design, Object-Oriented Programming, Functional Programming
Backend Technologies
- Languages: Python, Javascript, C#, F#
- Asynchronous Frameworks: asyncio / anyio, Celery, Redis pubsub, Apache Kafka
- Databases: PostgresSQL, Redis, Elasticsearch, Blockchain
- Local environment development with containerized environments: Docker, Docker Compose
- Web Frameworks: Django Rest Framework, Flask, FastAPI
- Cloud providers: AWS, Heroku
📖 Education & Qualifications
Universitat Politècnica de Catalunya (UPC)
Master in Computing, Software Engineering, Information Systems and Databases, 2011 - 2013
Specialisation in software engineering principles, design patterns and database management
Universitat Politècnica de Catalunya (UPC)
Technical Engineer in Computing Management, 2006 - 2009
📖 Trainings and Certifications
Communicating with Diplomacy and Tact, 2024/03
LinkedIn
Effective communication strategies for multicultural teams
Peopleware, Agile Teams and Management 3.0, 03/2023
233 Academy
Practices and techniques to create autonomous teams
Data Science and Machine Learning with Python - Hands On!, 2016/09
Udemy
Deep dive into the implementation of ML-powered python applications
Machine Learning, 2016/09
Coursera
Introduction to the concepts of machine learning, classification algorithms and recommendation systems
Misc. Skills
👅 Languages
Mother tongue: Catalan, Spanish
Other languages:
- English: Fluent, Cambridge First Certificate (B2)
🕹️ Hobbies
- Board games (chess, LOTR LCG, card games and strategy games in general)
- Video games
- Sports (gym, hiking, long walks)
- Learning new tech that can be used in my daily job
- A good tea with a good conversation topic