About Andrei
I do best with engineering leaders who want a partner, not a pair of hands. The most productive engagements I've had are ones where I'm trusted to make architectural decisions, push back on bad assumptions, and own delivery from kick-off through production handover.
I write production code, but I also do the work around it -- vendor evaluation, integration design, rollout planning, runbooks, incident response, knowledge transfer, team mentoring. The goal at the end of every engagement is that the system runs reliably without me, and the team that inherits it can extend it confidently.
My core expertise spans the .NET ecosystem (C#, .NET Core, Entity Framework, Dapper, PostgreSQL/MS SQL) and modern cloudnative infrastructure (AWS EKS/ECS//RDS/Lambda, Kubernetes, Terraform, Helm). I have additional production experience with Python (Django, FastAPI), Node.js (NestJS), and the full Grafana/Loki/Prometheus/DataDog + Sentry observability stack.
Industry background: banking and quantitative finance, insurance, healthcare, fintech. Regulated systems requiring PII encryption, audit trails, zero-downtime migrations, disaster recovery, and compliance.
Typical engagements:
- Designing and building greenfield backend services with full operational tooling
- Modernising legacy .NET applications and migrating them to cloud-native architecture
- Standing up complete engineering platforms from scratch (CI/CD, secrets management, observability, deployment)
- Authentication / authorization systems (IdentityServer, OAuth2, machine-to-machine)
- Observability rebuilds - Grafana, Loki, Prometheus, Sentry, DataDog.
English
Native or bilingual
Polish
Fluent
Remote only
Primarily works remotely
Experience
- US-based insurance platformStaff Backend EngineerBANKING AND INSURANCEJanuary 2025 - January 2026 (1 year)
- Designed PII encryption system across the company's main production platform: defined the integration architecture for backward compatibility, canary rollout, data migration, and disaster recovery.
- Led a team building a greenfield quote-aggregation microservice integrating multiple third-party insurance providers via REST APIs, with async processing, retries, and error reporting. Reduced failed quote requests by 90% and cut manual review from 2h/day to <10 min.
- Tech: Node.js / NestJS, REST APIs, PostgreSQL, AWS (EKS, S3, SNS/SQS, IAM), Docker, Terraform, CI/CD
- AI Startup (US, Series A)Staff Platform EngineerJuly 2024 - January 2025 (6 months)
- First infrastructure hire. Built the engineering platform end-to-end: local dev environment, CI/CD pipelines, production Kubernetes cluster, observability, secrets management and rotation, rollback mechanisms.
- Owned developer onboarding and enforced engineering standards across the team.
- Tech: Python / Django, LangChain, AWS (EKS, RDS, S3, IAM, SSM), Kubernetes, Helm, Terraform / Terragrunt, CI/CD, Grafana, Sentry
- HealthTech (AU)Staff Backend & DevOps ConsultantJuly 2023 - July 2025 (2 years)
- Worked across a fleet of 12 cross-dependent .NET Core microservices, owning architecture, deployment, and reliability.
- Built the authentication / authorization platform on IdentityServer: seamless migration of existing users, new SSO, and machine-to-machine auth across services.
- Integrated several legacy SOAP services into the modern .NET Core microservice fleet, preserving contracts with downstream consumers while modernizing the surrounding stack.
- Rebuilt CI/CD pipelines for all 12 services, eliminating version drift and standardizing deployments to Kubernetes.
- Designed and rolled out the full observability stack from zero (Grafana / Loki / Prometheus + Sentry) in an environment with no prior monitoring; defined the incident-response process.
- Replaced developer dependence on dev AWS infrastructure with a local-first workflow, materially reducing infra cost.
- Tech: .NET Core, C#, REST and SOAP APIs, MS SQL Server (T-SQL), PostgreSQL, Kafka, AWS (EKS, ECS/ECR, RDS, Lambda, S3, IAM, SSM), Docker, Kubernetes, Helm, Terraform, CI/CD, Grafana, Loki, Prometheus, Sentry
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Education
- Accounting and Corporate Financial ManagementBelarusian State University2011Accounting and Corporate Financial Management
- Mechanics and MathematicsBelarusian State University2009Mechanics and Mathematics