Available to hire
Hi, I’m Marcio Gualtieri. I’m a senior full-stack developer with a strong focus on back-end development, data engineering, and machine learning. I’ve worked across large corporations and startups, including advertising, finance, e-commerce, cybersecurity, and data analytics.
As a lifelong learner, I enjoy expanding my knowledge by building projects and collaborating with teams to deliver robust, scalable solutions.
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Expert
Expert
Expert
Expert
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Expert
Language
English
Fluent
Portuguese
Intermediate
Work Experience
Small Business Owner at Karakuri Apps
February 1, 2019 - PresentOperate my own company, primarily to generate invoices for contract roles, delivering software development services including backend, data engineering and ML-focused work for startups and clients.
Senior Backend Developer at AOL
December 31, 2014 - October 8, 2025On-site development of backend and data processing capabilities for a leading online media and digital advertising company; contributed to web services, data pipelines, and CI/CD improvements.
Senior Backend Developer at Dun & Bradstreet
May 31, 2016 - October 8, 2025Implemented backend features and data processing pipelines for enterprise financial and risk analytics; designed CI/CD pipelines and data processing workflows; supported migration and modernization efforts.
Senior Backend Developer & Data Engineer at PolySwarm
May 31, 2020 - October 8, 2025Feb 2019 - May 2020: Remote role; leveraged blockchain tooling to manage third-party malware detectors and consensus predictions; built malware data stores and ETL pipelines for security analytics.
Senior Backend Developer & Data Engineer at PolySwarm
July 31, 2022 - October 8, 2025Sept 2021 - July 2022: Oslo, Norway (Remote); led data analytics and ML-driven efforts for real estate advertising; ETL/ELT pipelines and ML models for predicting selling price, ad impressions, and clicks.
Senior Backend Developer & Data Engineer at Silvr
March 31, 2023 - October 8, 2025Remote, Paris, France; built backend features for Silvr's revenue-based financing platform; improved ETL/ELT data flows and real-time data processing using Airflow, PostgreSQL, Redis, and APIs.
Small Business Owner at Karakuri Apps
February 1, 2019 - PresentProvide consultancy services in software development, specializing in full-stack development, data engineering, and machine learning for startups and IT companies. Clients included Poly Swarm, Marketer, Silvr, and Finmatics. Emphasize clean code and test-driven development (TDD).
Senior Backend Developer & Data Engineer at Silvr
March 31, 2023 - October 8, 2025Developed full-stack features for Silvr's revenue-based financing platform; built data pipelines; implemented ML-driven analytics; performed backend and frontend changes; supported deployment on Kubernetes; contributed to data insights via RESTful APIs and data processing pipelines.
Senior Backend Developer & Data Engineer at Finmatics
July 1, 2024 - October 8, 2025Remote role leveraging machine learning, specifically large language models, to automate accounting tasks such as processing paper invoices and predicting missing or ineligible information on invoices. Built end-to-end data pipelines and backend/frontend changes.
Founder / Small Business Owner at Karakuri Apps
February 1, 2019 - PresentOperate my own small company, primarily to generate invoices for my contract roles.
Senior Backend Developer & Data Engineer at Silvr
March 2, 2023 - October 8, 2025Developed full-stack features for Silvr's revenue-based financing platform. Most features involved both backend and frontend changes, requiring a deep understanding of transactional and analytical aspects of the platform.
Senior Backend Developer & Data Engineer at Poly Swarm
May 2, 2020 - October 8, 2025Developed backend features using Java and Jersey; built data extraction pipelines; managed Kubernetes and CI/CD tooling; contributed to a consensus-based malware detector platform.
Senior Backend Developer at AOL
December 31, 2014 - October 8, 2025On-site, developed backend features using Java and Jersey; built and integrated backend services for online advertising platforms.
Senior Backend Developer at Dun & Bradstreet
May 31, 2016 - October 8, 2025Designed and implemented an ETL automation framework using Java; established CI/CD pipelines; contributed to data pipelines and microservices.
Senior Backend Developer & Data Engineer at Research Trend.AI
August 2, 2025 - October 8, 2025Designed and maintained scalable ETL pipelines using Airflow; processed AI research papers; integrated APIs (OpenAI, Google Search API) and web scraping for enrichment and provenance of data.
AI Research / Data Engineer
August 1, 2025 - October 8, 2025Designed and maintained scalable ETL pipelines and enriched data for AI research papers; integrated Airflow-based workflows with LLM/pipeline tooling and data extraction tasks.
Senior Backend Developer & Data Engineer at Silvr
March 1, 2023 - October 8, 2025Built backend and data platform features for a revenue-based financing platform; implemented deep backend and frontend changes, spanning transactional and analytical data flows.
Senior Backend Developer & Data Engineer (Remote) at Marketeer
July 1, 2022 - October 8, 2025Led backend and data engineering efforts; leveraged data analytics and ML to optimize real estate advertising.
Senior Backend Developer & Data Engineer (Remote) at PolySwarm
May 1, 2020 - October 8, 2025Developed backend data pipelines for threat intelligence platform; implemented data extraction, ETL, and ML prediction components.
Senior Backend Developer at Dun & Bradstreet
May 1, 2016 - October 8, 2025Designed and implemented data automation architecture (CI/CD via Jenkins, data pipelines) to support large-scale data processing.
Senior Backend Developer at AOL
December 1, 2014 - October 8, 2025On-site backend development role; contributed to data-driven ad tech, data pipelines, and legacy system modernization.
Education
Electrical Engineering and Computer Science at Universidade de São Paulo (USP)
January 11, 2030 - October 8, 2025Bachelor of Science in Electrical Engineering and Computer Science at USP - Universidade de São Paulo
January 1, 1999 - October 8, 2025Electrical Engineering, Computer Science at USP - Universidade de São Paulo
January 11, 2030 - October 8, 2025Electrical Engineering at Universidade de São Paulo (USP)
January 11, 2030 - October 8, 2025Computer Science at Universidade de São Paulo (USP)
January 11, 2030 - October 8, 2025Qualifications
dbt Fundamentals
January 11, 2030 - October 8, 2025AWS Fundamentals
January 11, 2030 - October 8, 2025AWS Fundamentals: Go Cloud-Native
January 11, 2030 - October 8, 2025Practical Machine Learning on H2O
January 11, 2030 - October 8, 2025AWS Fundamentals: Addressing Security Risks
January 11, 2030 - October 8, 2025AWS Fundamentals: Going Cloud-Native
January 11, 2030 - October 8, 2025Practical Machine Learning on H2O
January 11, 2030 - October 8, 2025Introduction to LangGraph / LangChain
January 11, 2030 - October 8, 2025dbt Fundamentals
January 1, 2024 - October 8, 2025Introduction to Data Engineering
January 1, 2023 - October 8, 2025AWS Fundamentals: Going Cloud-Native
January 1, 2020 - October 8, 2025AWS Fundamentals: Addressing Security Risk
January 1, 2020 - October 8, 2025AWS Fundamentals: GCP & BigQuery
January 1, 2021 - October 8, 2025Introduction to LangGraph / LangChain
January 11, 2030 - October 8, 2025dbt Fundamentals
January 11, 2030 - October 8, 2025AWS Fundamentals: Addressing Security Risks
January 11, 2030 - October 8, 2025Other Certifications
January 11, 2030 - October 8, 2025Industry Experience
Software & Internet, Professional Services, Financial Services, Media & Entertainment, Real Estate & Construction, Other, Retail
Several projects with samples of my work broken down by area of expertize (e.g., Back-end Development, Front-end Development, Data Engineering, Machine Learning) and programming language.
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