Яків

YAKOV YASKO
Senior .NET Engineer | Distributed Systems | Technical Leadership
Vinnytsia, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | t.me/Yasko_Yakov

PROFESSIONAL SUMMARY
Senior .NET Engineer with 6+ years of commercial experience building production-grade backend services, distributed systems, APIs, and complex
integrations across FinTech, e-commerce, and healthcare. Strong hands-on background in C#/.NET, ASP.NET Core, relational databases,
messaging, Docker/Kubernetes, Azure/AWS, and production troubleshooting, with commercial Angular and React experience. Works end to end
from business requirements and system design through implementation, testing, release, and production, combining hands-on engineering with
solution architecture, technical leadership, and AI-assisted development.

CORE EXPERTISE
Backend: C#, .NET 8, ASP.NET Core, Web API, Entity Framework Core, MediatR
Architecture: Distributed Systems, Microservices, System Design, Solution Architecture, Event-Driven Architecture, CQRS, Saga, Clean
Architecture
Data: SQL Server, PostgreSQL, MySQL, MongoDB, Redis
Messaging & APIs: RabbitMQ, Kafka, AWS SQS, REST APIs, gRPC, GraphQL
Cloud & DevOps: Docker, Kubernetes, Azure, AWS, CI/CD, GitHub Actions, Azure DevOps
Frontend: Angular, React, Redux-Saga, JavaScript/TypeScript
AI-Assisted Engineering: Claude Code, reusable skills/agents, spec-driven development, AI-assisted code review
Observability: Prometheus, Grafana, Graylog, Serilog, NLog, Production Troubleshooting

PROFESSIONAL EXPERIENCE
Senior .NET Backend Engineer | SpaceCrew Finance | FinTech | Remote | Dec 2023 - Present
Multi-country FinTech platforms; scope evolved from hands-on backend engineering into solution architecture and technical leadership.
• Designed and drove a reusable Payment Provider Service architecture, reducing new provider onboarding from 2 weeks to 1 day (~90%).
• Designed 9 third-party integrations across 3 markets, covering payments, banking, credit bureaus, KYC, open banking, and contact-center systems -
from requirements and vendor communication to architecture, API contracts, monitoring, and developer handoff.
• Developed and maintained Angular-based internal administration interfaces for FinTech operations, integrating frontend functionality with .NET
backend APIs.
• Took technical ownership of a distributed .NET FinTech platform spanning ~38 services, driving architecture decisions, production reliability,
releases, code reviews, and engineering quality.
• Strengthened engineering quality through broader unit/integration/E2E test coverage, code review, observability, and production-readiness
practices.
• Improved delivery through clearer technical specifications, implementation reviews, release practices, and production feedback loops.
• Led a technical audit of 39 repositories and turned the findings into a 42-initiative improvement plan across architecture, reliability, observability,
security, CI/CD, and databases.
• Built reusable AI-assisted engineering workflows with ~17 Claude Code skills and 3 specialized agents for architecture research, specifications,
implementation, testing, and code review.
• Investigated 181,000+ production alerts, identified recurring failure patterns and root causes, and drove remediation to significantly reduce alert
noise.

Full Stack Developer | Inforce | E-commerce | US client | Remote | Oct 2022 - Dec 2023
Shopify-integrated e-commerce platform; worked directly 1:1 with a US-based client, translating business requirements into technical solutions and
owning delivery from solution design through production support.
• Delivered an end-to-end e-commerce platform integrated with Shopify, building the React + Redux-Saga frontend and .NET Core Web API backend
using CQRS and MediatR.
• Built a reusable frontend design system with accessibility and automated testing, reducing feature delivery time by ~40%.
• Introduced Serilog-based observability and technical documentation, improving production diagnostics and maintainability.

Backend Developer | bART Solutions | Healthcare | Remote | Feb 2021 - Oct 2022
Healthcare laboratory management platform for food sample workflows and laboratory cleaning schedules.
• Developed ASP.NET Core backend services and REST APIs supporting laboratory workflow automation, sample-related operations, scheduling,
and operational data access.
• Designed secure APIs with authentication and role-based access control; optimized Entity Framework models and SQL queries, reducing endpoint
latency by ~25%.
• Refactored legacy functionality into modular services using CQRS and Clean Architecture while collaborating with international stakeholders on
delivery.

Junior Backend Developer | Delphi Software | E-commerce | Vinnytsia, Ukraine | Jan 2020 - Feb 2021
Backend development for a LEGO e-commerce platform, focused on customer, order, database, and background-processing workflows.
• Developed C#/.NET backend services and APIs supporting customer and order management.
• Built multi-threaded background workers for concurrent MS SQL workloads while maintaining data integrity.
• Worked with Entity Framework, database schemas, stored procedures, and SQL optimization; reduced reporting execution time by ~40%.

EDUCATION & PROFESSIONAL DEVELOPMENT
Master's Degree, Computer Engineering - Vinnytsia National Technical University | 2023 - 2025