Senior Software Engineer specializing in legacy system modernization and process automation. I dive deep into existing systems to deliver measurable business results through technical transformation.
Resolved critical payment encryption roadblock in 6 weeks that had blocked development teams for 18 months at American Express. Delivered real-time encryption service processing 1M+ transactions/day with sub-50ms latency while achieving regulatory compliance across international markets.
Redesigned legacy monolithic system into cloud-native microservices, improving throughput by 20x and reducing operational costs by 60% while handling 1GB/s data streams for critical operations.
Built comprehensive automated testing framework that eliminated manual contractor processes, accelerating delivery timelines by 6 months and saving $5M in operational costs.
Developed monitoring tools preventing $400K/day revenue loss across 100+ retail locations through proactive system monitoring and automated alerting.
Led technical transformation of government systems serving 3 states, migrating from 1980s COBOL/VBA/Access systems to modern web-based platform, enabling self-service access that previously required manual customer service intervention.
I specialize in diving into legacy systems regardless of age or technology stack - from 1980s COBOL to modern cloud platforms. My approach focuses on understanding existing business processes and delivering automation that provides immediate measurable value.
Core Strengths:
- Legacy System Analysis: Rapid assessment and modernization of systems spanning decades of technology evolution
- Process Automation: Converting manual workflows into automated solutions that reduce costs and eliminate errors
- Performance Optimization: Identifying and resolving bottlenecks that limit system throughput and user experience
- Data Integration: Connecting disparate systems to enable seamless information flow
- Zero-Downtime Migrations: Implementing new systems while maintaining continuous business operations
- Languages: Python, Java/Kotlin, JavaScript/TypeScript, Go, C/C++, SQL, Ruby
- Backend & APIs: Django, Flask, Spring Boot, Node.js/Express, Ruby on Rails, RESTful APIs, GraphQL
- Cloud & Infrastructure: AWS, Google Cloud, Docker, Kubernetes, Terraform, CI/CD Pipelines
- Databases: PostgreSQL, MySQL, MongoDB, Redis, BigQuery, Database Design & Optimization
- Frontend: React, Angular, Next.js, React Native, Responsive Design
- Systems: Linux, Shell Scripting, Performance Monitoring, Distributed Systems
- Master of Science in Software Engineering - Vermont Technical College (2021)
- Bachelor of Science in Software Engineering - Vermont Technical College (2015)
- Meta Generalist Software Engineer Certificate (August 2025)
- Meta Android Developer (August 2024)
- Meta Full-Stack Engineer Certificate (October 2024)
- Meta Database Engineer (March 2025)
- Meta React Native (October 2024)
- Meta Back-End Developer (September 2024)
- Meta Front-End Developer (September 2024)
- Amazon Software Developer (December 2024)
- AWS Cloud Technology Consultant (October 2024)
- IBM Java Developer (August 2025)
- IBM Back-end JavaScript Developer (July 2025)
- IBM AI Developer (March 2025)
- IBM DevOps and Software Engineering (October 2024)
- People and Soft Skills for Professional Success (October 2024)
- Google IT Support (July 2025)
- Google Cloud Platform - BigQuery
- Google Cloud Platform - Terraform
- Python 3 Programming - University of Michigan (December 2024)
- Programming with Google Go - UC Irvine (November 2024)
- Angular 17 Specialization - LearnQuest (August 2025)
- LinkedIn Learning Ruby on Rails (February 2025)
- C++ Institute CPP (C++ Certified Professional Programmer) (June 2025)
- C++ Institute CLA (C Certified Associate Programmer) (July 2019)
- BigQuery Advanced Data Warehousing
- JMeter Performance Testing
- Next.js React Framework
- Vim Advanced Text Editor
GoCard - File-Based Spaced Repetition System
A lightweight, markdown-based flashcard application built in Go featuring:
- Plain Markdown file organization as data source
- Clean terminal UI with rich Markdown rendering
- Enhanced SM-2 spaced repetition algorithm
- Git integration for knowledge base version control
- Email: David.Miserak@gmail.com
- LinkedIn: linkedin.com/in/miserak
- Credly: credly.com/users/david-miserak
Delivering measurable results through technical transformation of legacy systems and manual processes.