LPLeonardo Paixão
@leonardopaixo
Senior Backend Engineer specializing in reliable, secure fintech and platform systems.
BrazilWhat I'm looking for
I’m a Senior Backend Engineer with over ten years of experience writing code and seven years designing large-scale systems, primarily in fintech and platform engineering.
At Deel I build and maintain backend services for authentication, security, and user identity, including SSO, 2FA, RBAC, and profile management, and I’ve improved observability with Datadog, Grafana, and OpenTelemetry.
Previously at Itaú Unibanco I worked on payment and automation systems, contributed to Pix transaction-code interpretation and Central Bank API integration, and led KYC/KYB/AML and reconciliation improvements that greatly reduced verification times and resource consumption.
I care deeply about system reliability, data integrity, and security, and I enjoy building idempotent APIs, ledger and journal designs, multi-currency operations, and automation that deliver measurable cost, performance, and compliance benefits.
Experience
Work history, roles, and key accomplishments
DEBuilt and maintained backend services for authentication, security, and user identity (SSO, 2FA, RBAC, profile management), improved observability and reduced session-related load across global services.
Software Engineer
Itaú Unibanco
Dec 2020 - May 2024 (3 years 5 months)
Developed payment and automation systems including contributions to Pix transaction code interpretation and Central Bank API integration, optimized session management to reduce core system consumption by 99% and improved scraping performance by 50%.
Junior Software Engineer
Itaú Unibanco
May 2020 - May 2022 (2 years)
Implemented process automation and backend features, achieving a 15% reduction in processing time and measurable NPS improvements through targeted customer-facing enhancements.
Architecture Designer / Tech Lead
ContraDP Monitores
Nov 2018 - Oct 2019 (11 months)
Led backend development and system architecture, managed a small engineering team, and implemented messaging/queue systems and authentication flows using Redis.
Freelance Back-End Developer
Freelance
Jan 2016 - Oct 2019 (3 years 9 months)
Engineered and optimized RESTful APIs and relational databases for multiple clients, improving API performance by ~30% and implementing secure authentication with JWT and OAuth 2.0.
Education
Degrees, certifications, and relevant coursework
São Judas Tadeu University
Bachelor's Degree, Computer Engineering
2016 - 2021
Bachelor's Degree in Computer Engineering completed between 2016 and 2021 with a focus on backend systems and distributed transaction reliability.
Instituto Federal de Educação, Ciência e Tecnologia de São Paulo - IFSP
2011 - 2015
Attended IFSP from 2011 to 2015 (program and degree not specified).
Availability
Location
BrazilAuthorized to work in
Social media
Job categories
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