Maryna Wheeler

Principal Software Engineer @ Quorus

About

Staff-level fintech engineer with 10 years designing secure, scalable payment and blockchain platforms processing millions in transactions monthly. Currently at Atelio by FIS, I architect real-time case management systems (>200 RPS, ≤200ms P99 latency) and lead sanctions screening and case management platforms that safeguard the financial ecosystem. My expertise spans the full fintech stack: from blockchain integrations and custody platforms to payments and fraud detection systems. Core Expertise: • Payments & Fraud Detection: Built custody platforms with blockchain transaction settlement, ATM and terminals transaction processing, sanctions screening, and case management. • Blockchain & DeFi: Blockchain payment security, Ethereum and Bitcoin integrations, crypto wallet architecture, and liquidity management systems. • Scalable Architecture: Event-driven microservices, real-time processing systems, and distributed systems design. • Leadership: Technical lead for cross-functional teams, mentoring engineers from mid-level to senior roles Tech Stack: Python (Django, FastAPI), TypeScript/JavaScript, Java, Solidity, AWS, Kafka, PostgreSQL, DynamoDB Seeking Staff Software Engineer opportunities to apply my deep fintech domain knowledge and technical leadership in building the next generation of financial technology.

Country

United States

City

Greater Seattle Area

Industry

Computer Software

Skill

FastAPI, Microsoft Azure, Twilio, System Deployment, payment platform, Embedded Systems, Digital Assets, Cryptocurrency Payment Processing, Electronic Payment Processing, Digital Wallets, Blockchain Architecture, Trading Systems, Customer Relationship Management (CRM), SOAP, REST APIs, Bootstrap (Framework), E-payments, Payment Card Processing, Blockchain Security, Solidity

Experience

Principal Software Engineer

Quorus

2025-10 - Present · 1 yr

Senior Software Engineer II (L5)

Atelio by FIS

2024-10 - 2025-10 · 1 yr 1 mo

Seattle, Washington, United States

Architect and tech-lead financial compliance systems processing 2M+ monthly case investigations with sub-200ms response times. • Built enterprise-grade sanctions screening platform using Java, AWS OpenSearch, DynamoDB, and Lambda with dead letter queue handling with 99% uptime. • Designed event-driven microservices architecture (Python/FastAPI, AWS Kafka, DynamoDB) powering AI-driven case analysis for financial crime detection. • Contributed to real-time case management platform handling >200 RPS with ≤200ms P99 latency, enabling faster investigation workflows for compliance teams.

Principal Software Engineer

Prometheum

2022-9 - 2024-9 · 2 yrs 1 mo

United States

• Led blockchain integration strategy for regulated financial services, implementing secure transaction processing with Ethereum smart contracts. • Architected customer transaction management system supporting direct deposits, collect deposits, and withdrawals with built-in fraud detection. • Implemented Transaction Security Layer ensuring compliance with financial regulations while maintaining high-performance throughput.

Software Technical Lead

ThinkTech

2021-9 - 2022-9 · 1 yr 1 mo

United States

• Developed wallet broker with BitcoinD integration for secure cryptocurrency storage and transaction processing. • Built automated business intelligence pipeline (CRM) collecting real-time data from ATM providers for transaction monitoring and analytics. • Implemented Liquidity Management System (IMS) for automated cryptocurrency flow optimization.

Senior Software Engineer

ThinkTech

2018-6 - 2020-8 · 2 yrs 3 mos

Remote

• Created secure password sharing service (Key2Lyf) using Shamir's Secret Sharing algorithm for cryptographic key recovery • Architected and developed cryptocurrency transaction processing system enabling secure transactions across multiple blockchain platforms (Bitcoin, Ethereum). • Led full-stack development of scalable web services and admin dashboards using Python/Django architecture. • Built centralized cryptocurrency trading platform (DSTA) with real-time order matching and liquidity management.

Full Stack Developer

ThinkTech

2016-1 - 2018-5 · 2 yrs 5 mos

Remote

• Developed ATM payment processing infrastructure handling high-volume transactions with robust error handling and fraud detection. • Implemented Ethereum blockchain integration for secure transaction processing and smart contract interactions. • Designed and implemented secure password recovery system (SecondFactor) for blockchain wallets using advanced cryptographic techniques to solve non-trivial key recovery challenges.

Backend Python developer

TRIO pay system (https://pay-trio.com/)

2015-7 - 2015-12 · 6 mos

Kiev Region, Ukraine

• Developed embedded finance payment platform integrating multiple card providers and payment processors for seamless transaction routing. • Built comprehensive payment analytics dashboards and reporting tools for transaction monitoring and business intelligence.