Open to opportunities

Aleksei Grishchenko

@alekgrishchenko

Message

I’m a senior backend engineer delivering high-load, event-driven platforms with strong reliability and leadership.

Germany

Message

What I'm looking for

I want to build reliable, high-throughput backend systems for complex domains, with real ownership from system design to production. I’m happiest leading teams through mentoring, clear engineering practices, and close collaboration with product and compliance.

I’m a Senior Backend Engineer with 12+ years building scalable backend platforms for FinTech, MedTech, and high-load SaaS/EdTech—supporting systems at 30–40k RPS and millions of users. I focus on KYC/sponsor-bank integrations, ledger and reconciliation logic, and production reliability using idempotency, partitioning, retries, and async handling. I also care deeply about observability so teams can detect, diagnose, and fix issues fast.

I’ve led backend teams through hiring, mentoring, code review, and cross-functional stakeholder work across engineering, product, and compliance. In my recent roles, I implemented automated onboarding via KYC providers, reduced manual workload (~23.7%), improved transfer success (~13.2%), and built compliant statement aggregation systems. I’m currently building a FinTech platform (150k+ users) where performance, correctness, and maintainable service boundaries are core to how I work.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Grabr Inc.

Jan 2023 - Present (3 years 5 months)

Built backend integrations with KYC providers and US sponsor banks to enable automated onboarding for 150k+ users. Improved transaction reliability with idempotency and async handling, and developed a compliant monthly statement aggregation system with dispute reconciliation.

Ruby on Rails PostgreSQL Docker Kubernetes AWS S3 Redis Sidekiq GraphQL RSpec KYC Retry Strategies Sentry Prometheus Grafana Ledger Systems

Senior Software Engineer

Heally Inc.

Jan 2022 - Jan 2023 (1 year)

Developed multi-provider payments (Stripe, Dwolla, Braintree) with fee/refund and transaction validation logic. Led HIPAA/GDPR-compliant encryption efforts and helped migrate a Rails monolith toward a modular monolith architecture with new service/domain boundaries.

Ruby on Rails PostgreSQL Docker Kubernetes AWS Redis Sidekiq RSpec Gitlab CI Stripe Dwolla Braintree HIPAA GDPR Encryption Twilio Code Review Payments

Senior Software Developer / Team Lead

UCHIRU

Jan 2018 - Jan 2022 (4 years)

Led a team of 3 backend engineers, including hiring and mentoring, and drove technical decisions and delivery roadmap. Designed and operated high-load microservices and data/event contracts (Kafka/Avro + Schema Registry), and supported reliability, CI/CD, and scaling efforts during a monolith-to-microservices migration.

Ruby Ruby on Rails PostgreSQL Kafka RabbitMQ Redis Elasticsearch Clickhouse Docker Prometheus Grafana CI CD CircleCi GitHub Actions Avro Microservices Agile Scrum A B Testing Event Driven Architecture Traffic Splitting

Ruby on Rails Software Engineer

Novartis AG

Jan 2017 - Jan 2018 (1 year)

Developed internal Ruby on Rails applications and integrations used by internal teams. Collaborated with stakeholders to extend and maintain existing tools and workflows.

Ruby on Rails Application Development Integration

Ruby on Rails Engineer

Wunderagent GmbH

Jan 2015 - Jan 2017 (2 years)

Developed backend services and APIs for a real estate SaaS platform. Worked on property management and listings features and integration work with external services.

Ruby on Rails Backend Services APIs Property Management Listings

Ruby on Rails Engineer

Innovat

Jan 2014 - Jan 2015 (1 year)

Worked on the backend of an electronic school diary service for parents, students, and teachers. Contributed to API and data model changes to support new use cases and integrations.

Ruby on Rails Backend Development APIs Data Modeling Integration