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Daniel Coll SolDC

Daniel Coll Sol

Supermalter

Data Engineer

€240/day
3 projects
Barcelona, ES
8-15 years

Average response time: 12 hours

Freelancer profile translated to English.
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About Daniel

Software engineer specialized in Data Engineering and backend, with more than 7 years of experience building data systems and applications in production.

I have worked designing and developing data pipelines, APIs, and scalable architectures in cloud environments (AWS, GCP, Azure), in both startups and international organizations.

I am currently the sole engineer behind WeShare (), an application in production where I have developed the end-to-end system: backend, data model, APIs, data flows, and operation. This has given me a complete vision on how to design reliable, scalable, and product-oriented systems.

My main focus is on building practical and maintainable solutions: from data pipelines and automation to backend services and distributed systems. I regularly work with Python, SQL, and Node.js, integrating different services and optimizing performance and data quality.

I also have experience in complex data environments, working with large volumes of data, ensuring its consistency, traceability, and usability for analysis.

Accustomed to working autonomously, with a focus on results and a strong orientation towards product and business.
  • English

    Native or bilingual

  • French

    Native or bilingual

  • Spanish

    Native or bilingual

  • Catalan

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • WeShare
    Lead Software & Data Engineer
    ENVIRONMENTAL
    October 2023 - Today (2 years and 10 months)
    Barcelona, Spain
    • Designed and implemented the backend and data architecture of a production-grade sharing platform.

    • Built scalable APIs, data pipelines, automation workflows, and AI-powered services using TypeScript, PostgreSQL, and Supabase.

    • Developed intelligent data processing solutions leveraging LLMs, embeddings, and retrieval-based workflows to automate community insights and recommendations.
    Typescript React Native Supabase Stripe Product management
  • Tax Justice Network
    SENIOR DATA ENGINEER
    BANKING AND INSURANCE
    June 2021 - October 2023 (2 years and 4 months)
    London, UK
    • Designed and executed data models to analyze global financial data for policy impact studies.
    • Built and curated training datasets for machine learning models aimed at detecting illicit financial flows.
    • Led infrastructure design and built scalable pipelines for analyzing and visualizing complex financial data.
    Data Engineering ETL Data Modelling Machine learning
  • EasyPeasy
    DATA ENGINEER & ANALYST
    SOCIAL NETWORKS
    September 2020 - June 2021 (9 months)
    London, UK
    • Implemented machine learning models for customer segmentation and targeted marketing campaigns.
    • Analyzed large datasets to optimize product features and increase customer satisfaction.
    Machine learning Data analysis Python SQL Customer Segmentation and Analysis

Reviews

5.0

Out of 2 ratings

M

Marta

Data & Software Engineer - Ferrer Internacional

Several months project

-

Reviewed on 4/20/2026

Daniel has demonstrated a remarkable level of excellence throughout his work, both from a technical standpoint and in his ability to understand the project's real needs. His approach combines rigor, judgment, and a strong orientation towards providing useful and well-grounded solutions. He doesn't just execute; he adds value through a deep understanding of the context and objectives. Furthermore, his attitude in teamwork has been impeccable, facilitating collaboration and contributing to a very positive dynamic. The result has been exceptional work, both in terms of quality delivered and the way it was developed. Without a doubt, a highly recommendable profile.
GB

Gilbert Bart

Especialista en DevOps - IDOM Consulting

Several days project

-

Reviewed on 4/8/2026

Daniel collaborated with us on a DevOps project with particularly tight deadlines, and the result was outstanding. He was involved from the beginning, maintained clear and constant communication, and met deadlines impeccably: we set him a deadline, and he actually made an effort to finish ahead of schedule so we could incorporate a small round of feedback and adjustments. In our opinion, he has also demonstrated extensive knowledge in DevOps and a very solid approach to bringing work to a successful conclusion in demanding scenarios. We intend to work with him on future projects and fully recommend him as a professional. We plan to work with him on future projects and fully recommend him as a professional.

Recommendations

GB
ÍM
Gilbert Bart Puy Navarro and 1 other person have recommended Daniel

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Education

  • M.Sc.Mathematical
    Rovira i Virgili University and Open University of Catalonia
    2019
    M.Sc.Mathematical
  • PG. Mobile Application Development
    Open University of Catalonia
    2018
    PG. Mobile Application Development

Skill set

Categories