Mateus Ataide

Software Engineer

Stone · sep 2026 – present

• building on payment systems that run across roughly 5m pos terminals and reach more than 5m clients, at one of brazil's largest fintechs.

~5M

POS terminals

5M+

Clients reached

Software Engineer

Robbin · jul 2026 – sep 2026

• helped build an agentic slack tool for payment reprocessing. the process took 30 to 60 minutes and leaned heavily on developer availability; the operations team now runs it with full autonomy and resolves it in under 2 minutes.
• audited aws spend and scoped a projected reduction of over 50% (~r$30k/year) — moving log retention to s3 and right-sizing ecs services.
• moved database migrations into a ci/cd action, removing over 70% of the manual work previously done by hand through aws.

< 2 min

Payment reprocessing, was 30–60min

−50%

Projected AWS saving (~R$30k/year)

−70%

Manual migration work

Team Leader

Amigo Tech · sep 2025 – may 2026

• led a fintech squad building payment solutions, driving technical decisions, solution planning and product alignment — and mentoring engineers through code reviews, 1:1s and continuous feedback.
• designed and launched a partner api for e-commerce integrations enabling flexible multi-payment checkout — pix qr code and installment card payments with dynamic interest calculation — with redis-backed rate limiting and ip controls in nestjs. projected +30% revenue.
• cut payment-slip (boleto) generation from over 2 minutes to 100ms by moving installment creation to an asynchronous model.
• architected the med (pix dispute) system from scratch, delivered in 1 week with unit tests, webhooks and a complete refund flow, meeting a critical bacen requirement — impacts 75% of monthly transactions.
• contributed to features sustaining an average 17% monthly growth in transaction volume across the payment platform.

+30%

Projected revenue

100ms

Boleto generation, from 2min

1 week

MED system shipped

+17%

Monthly volume growth

Software Engineer

Amigo Tech · sep 2024 – may 2026

• drove the evolution of amigo pay, the financial platform inside the amigo ecosystem, building and integrating high-impact features in nestjs/typescript and go on a platform processing 100m+ tpv.
• reduced accounts-receivable query latency from 13s to 150ms (~85x) by optimizing postgresql queries, execution plans and indexes over high-volume financial datasets.
• designed and built from scratch a secure otp validation api supporting r$35m+/month in transaction volume — the first security layer for every sensitive payment operation, with session-based validation and attempt blocking against fraud.
• implemented reliable payment webhook flows, improving asynchronous transaction updates and reconciliation accuracy across the platform.
• enhanced pos systems with transaction history and automated email reporting in react native and node.js, improving merchant visibility.
• built an ai customer support bot in python using rag + the openai api — cut support handling time by 40% in production.
• implemented observability with grafana and datadog — metrics, logs and alerts — ensuring 99% slo and supporting production experiment analysis.

R$60M+

Processed monthly

~85x

Query speedup

R$35M+

Secured by the OTP layer

Founding Engineer

Brightlift · 2023 – 2026

ai-powered automation for digital marketing campaigns.

• built and maintained ai agents integrated with llm apis (openai, gemini), implementing rag, mcp, function calling and streaming with focus on maximizing value per token in automation workflows.
• built llm evaluation and benchmarking infrastructure for model comparison without altering the application layer — enabling data-driven decisions.
• developed backend with fastapi (python), scraping + nlp pipeline for large-scale data analysis in mongodb, containerized with docker + ci/cd on aws.

Computer Technology / Computer Systems

UFPE — Centro de Informática (CIn) · jan 2023 – jan 2027

• one of the top cs teaching and research centers in brazil and latin america.
• key subjects: algorithms, data structures, operating systems, oop, software engineering, systems architecture, ai, databases.
• teaching assistant since 2023 for algorithms & data structures and programming logic — helping students with problem solving, complexity analysis and computational thinking.