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Angel Szymczak

@angelszymczak

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I build reliable backend systems, payments, and AI-enabled web products.

Argentina

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What I'm looking for

I'm looking for remote, product-focused engineering work where I can own reliable backend and distributed systems, collaborate across Product and Engineering, and apply AI-assisted development, cloud infrastructure, and strong delivery practices.

I've built backend systems and web products for Google (via EPAM), SchoolStatus, Southworks, Nubi, Bitex, and SeSocio. My work spans operational workflows, real-time communication, conversational AI, payments, trading, and onboarding systems.

At Google, I improved enrollment, pricing, approvals, and classroom-provisioning workflows across distributed internal services. At SchoolStatus, I owned SMS, conferencing, delivery-tracking, and session-lifecycle workflows, strengthening retries, webhook handling, failure recovery, and participant synchronization.

I've delivered Ruby on Rails services, PostgreSQL-backed APIs, asynchronous processing, event-driven systems, cloud infrastructure, automated testing, CI/CD, and production operations. In fintech roles, I built payment, reconciliation, trading, KYC, and provider-integration workflows with a focus on idempotency, data consistency, validation, and operational reliability.

I also build AI-assisted products and agentic workflows using LLM integrations, RAG, structured outputs, LangChain, and n8n. I enjoy taking work from product requirements and technical trade-offs through implementation, reviews, documentation, deployment, and reliable production operation.

Experience

Work history, roles, and key accomplishments

Software Engineer

Google (EPAM)

Feb 2024 - Jul 2024 (5 months)

Owned and improved enrollment, pricing, approvals, and classroom provisioning workflows across complex operational states. Built and integrated application features across Python/Flask, gRPC, and Angular services within distributed internal systems.

Python Flask Dart Angular Material Design gRPC GCP Mutation Testing CI CD Google Classroom Google Calendar

Backend Engineer

SchoolStatus

Apr 2023 - Aug 2023 (4 months)

Owned backend communication workflows for SMS, conferencing, delivery tracking, and session lifecycle management. Improved reliability of asynchronous workflows through retry strategies, webhook handling, failure recovery, and participant sync.

Ruby Sidekiq Kafka PostgreSQL Redis React AWS Datadog Cloudwatch Event Driven Architecture Retry Strategies Webhooks Bandwidth Twilio

Software Engineer (L3)

Southworks

May 2020 - Sep 2021 (1 year 4 months)

Built and evolved backend services and integrations for conversational AI and virtual-assistant workflows using TypeScript and Go. Improved asynchronous messaging and event-driven workflows across distributed cloud environments.

Backend Engineer

Nubi

Sep 2019 - May 2020 (8 months)

Owned backend payment workflows supporting cross-border financial operations and external provider integrations. Improved payment and provider integration reliability through idempotency, failure handling, and operational safeguards.

PostgreSQL Redis RabbitMQ Ruby Express JavaScript React HTML CSS AWS Lambda API Gateway DynamoDB IAM Cognito Elastic Beanstalk Prometheus Grafana Transaction Processing Comafi Bank Wise PayPal

Software Engineer

Bitex

Dec 2017 - May 2019 (1 year 5 months)

Owned Ruby backend workflows for trading, order execution, and liquidity operations across multiple exchange integrations. Improved resilience of order execution and exchange synchronization through retry strategies, validation, and failure handling.

Ruby PostgreSQL Redis ERB JavaScript Docker AWS EC2 S3 Cloudwatch Capistrano CircleCi New Relic Order Processing Exchange Integration Retry Strategies REST APIs Bitstamp Bitso Bitfinex Bind Trezor

Software Engineer

SeSocio

Mar 2017 - Dec 2017 (9 months)

Owned Ruby on Rails onboarding and Know Your Customer workflows, including automated SMS verification and progressive user flows. Improved legacy frontend and backend onboarding reliability through stronger validation and automated testing.