Senior .NET Engineer | Microservices & Distributed Systems | ASP.NET Core, Kafka, AWS, Kubernetes | High-Load E-commerce & Payments | iGaming
Aktualisiert am 15.09.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 11.09.2026
Verfügbar zu: 100%
davon vor Ort: 0%
C#
ASP.NET
Microservices
Kafka
PostgreSQL
MS SQL Server
SQL
Distributed Systems
AWS
Kubernetes
Domain Driven Design
.NET 4.6
.NET Framework
JavaScript
RabbitMQ
System Design
Docker
REST API
gRPC
Payment Systems
E-Commerce
CI/CD
Event-Driven Architecture
English
B2, British Council certified
Ukrainian
native
Russian
fluent
Polish
A2

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

2 years
2024-10 - now

Cross-border e-commerce platform | high-load event-driven microservices | Checkout, Cart & Payments domain

Senior .NET Engineer ? Global-e C# .NET 8 .NET 6 ...
Senior .NET Engineer ? Global-e
  • Designed and built the Checkout API microservice from scratch on ASP.NET Core, Apache Kafka and Couchbase, serving every checkout flow of the platform ? one-page, Shopify and standard checkout ? under high-volume cross-border traffic; led its zero-downtime cutover with no feature freeze.
  • Built a payment-processor integration layer on Spreedly that cut onboarding of a new payment provider (PayPal, CyberSource and others) from 1?2 months to 1 day; delivered Apple Pay and 3DS / SCA flows, with Datadog monitors in Terraform for transaction metrics.
  • Migrated 200,000 subscriptions and 800,000 subscription items ? six years of production data ? onto a new subscription service with no customer-visible downtime.
  • Developed an Order SAGA on MassTransit and AWS SQS / SNS for distributed transactional consistency, and built the Cart service owning checkout and recurring orders.
  • Created API and background-worker microservice templates that cut new-service bootstrap time by 80% and became the platform standard, adopted by every Scrum team.
  • Contributed to the internal Couchbase, Kafka and RabbitMQ SDKs used across all teams; built the checkout test automation framework (Page Object Model).
C# .NET 8 .NET 6 .NET Core ASP.NET Core ASP.NET Core Web API Minimal APIs TypeScript JavaScript T-SQL SQL Microservices Distributed Systems Event-Driven Architecture Domain-Driven Design (DDD) CQRS SAGA pattern Claude Code Cursor
Global-E
Remote, Warsaw, Poland
1 year
2023-11 - 2024-10

High-load iGaming platform | microservices-based casino and sportsbook

Senior .NET Engineer C# .NET 8 .NET 6 ...
Senior .NET Engineer
  • Led the sportsbook?bonus-provider integration end to end, from requirements to production, enabling bonuses on sports betting across the platform.
  • Delivered the RaceBook horse-racing integration that went on to generate 30% of total sportsbook GGR; integrated a third-party sportsbook SPA, saving 500?700% versus building in-house.
  • Handled 20+ live production incidents on a real-money betting platform, containing revenue impact in real time.
  • Decomposed and estimated the deposit-cashback epic, wrote user stories and gathered requirements directly from the product owner and customers.
C# .NET 8 .NET 6 .NET Core ASP.NET Core ASP.NET Core Web API Minimal APIs Microservices Distributed Systems Event-Driven Architecture Domain-Driven Design (DDD) CQRS PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core) OpenTelemetry distributed tracing payment gateway integration
TechTellent
Remote
2 years 4 months
2021-08 - 2023-11

Built a gRPC service

.NET Engineer PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core) ...
.NET Engineer
  • Built a gRPC service for insurance companies from scratch ? 12 companies onboarded in the first month after release.
  • Delivered permission-based premium subscriptions, purchased by 30%+ of users within 6 months.
  • Built 50+ reusable Blazor components, eliminating 8,000+ lines of duplicated code across the admin platform.
  • Extended the Symptom Checker web API, delivered 4 data migrations from doctor-supplied Excel data, and optimized Entity Framework queries and schema migrations.
PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core) Dapper LINQ query optimization schema migrations Agile Scrum Kanban Jira Confluence technical documentation estimation and decomposition Hangfire RabbitMQ MassTransit ASP.NET Core gRPC Angular Blazor
Mark, Personal Medical Assistant / Healthcare startup
Remote
1 year 10 months
2019-11 - 2021-08

Cloud Robotic Process Automation (RPA) platform | React and ASP.NET Core microservices

Fullstack .NET Engineer OpenAPI / Swagger IdentityServer OAuth 2.0 ...
Fullstack .NET Engineer
  • Designed a task-transition graph predicting digital-worker availability, lifting robot efficiency from 20?25% to 65?70%.
  • Raised microservice test coverage from 20% to 85%, cutting 2?6 working hours off each feature delivery.
  • Delivered a migration tool spanning 3 application versions and 15 databases, and a large epic integrating the web API microservice with the scheduling subsystem.
  • Built SpecFlow / BDD test infrastructure and optimized T-SQL and Entity Framework queries; mentored a trainee to junior level and lectured OOP and UML to interns, 30% of whom were hired.
OpenAPI / Swagger IdentityServer OAuth 2.0 OpenID Connect JWT async / await multithreading concurrency Azure Service Bus publish / subscribe asynchronous processing C# .NET 8 .NET 6 .NET Core ASP.NET Core ASP.NET Core Web API PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core)
NIX Solutions
Kharkiv, Ukraine

Aus- und Weiterbildung

Aus- und Weiterbildung

3 years 9 months
2020-09 - 2024-05

BSc, Computer Science ? Software Engineering

Bachelor, Kharkiv National University of Radio Electronics, Ukraine
Bachelor
Kharkiv National University of Radio Electronics, Ukraine

  • Computer Science
  • Backend Development
  • Software Engineering
  • Project Management
  • Algorithms and Data Structures
  • Business English
  • Software Development

Position

Position

Senior .NET Engineer building high-load, event-driven microservices on ASP.NET Core, Kafka and AWS ? 7 years across e-commerce checkout, payments, iGaming and healthcare. I own services end to end: system design, API contracts, messaging, data, CI/CD and production.

WHAT I DO

- Distributed systems: event-driven architecture, DDD, CQRS, SAGA, idempotency and resilience patterns on Kafka, RabbitMQ and MassTransit

- Cloud-native .NET on AWS (EKS, SQS/SNS, S3, RDS) and Kubernetes ? services that run under real cross-border e-commerce traffic

- Platform leverage: service templates, internal SDKs, test automation ? the infrastructure that makes every other engineer on the team faster

SELECTED RESULTS

- Designed and built the Checkout API microservice from scratch for a cross-border e-commerce platform (ASP.NET Core, Kafka, Couchbase) and led its zero-downtime cutover

- Built a Spreedly-based payment-processor integration layer that cut new-provider onboarding (PayPal, CyberSource) from 1?2 months to 1 day

- Migrated 200K subscriptions / 800K subscription items ? six years of production data ? with no customer-visible downtime

- Cut new microservice bootstrap time by 80% with API + worker templates adopted by every Scrum team

- Delivered a sportsbook integration that now generates 30% of total GGR on a real-money iGaming platform

- Raised microservice test coverage from 20% to 85%, cutting 2?6 hours off every feature delivery

- Lifted RPA digital-worker efficiency from 20?25% to 65?70% with a task-transition prediction graph

HOW I WORK

AI-native engineering workflow: spec-driven development, Claude Code and Cursor, custom MCP servers against the codebase, AI-assisted code review. Async-first ? written specs, decisions in writing, deep-work blocks in between. That's why the output density is what it is.

STACK

C# / .NET 8 · ASP.NET Core · Kafka, RabbitMQ, MassTransit · AWS (EKS, SQS/SNS, S3, RDS), Azure, Kubernetes, Docker · PostgreSQL, MS SQL, MongoDB, Couchbase, Redis, Elasticsearch · gRPC, REST, SignalR · OpenTelemetry, Grafana · React, TypeScript, Blazor

Based in Warsaw, CET ? full overlap with the European working day. Polish sole proprietorship (B2B): I invoice EU clients directly under reverse charge, no EOR needed.

English B2 (British Council). [URL by request]

Kompetenzen

Kompetenzen

Top-Skills

C# ASP.NET Microservices Kafka PostgreSQL MS SQL Server SQL Distributed Systems AWS Kubernetes Domain Driven Design .NET 4.6 .NET Framework JavaScript RabbitMQ System Design Docker REST API gRPC Payment Systems E-Commerce CI/CD Event-Driven Architecture

Produkte / Standards / Erfahrungen / Methoden

PROFESSIONAL SUMMARY

Senior .NET Engineer with 7 years designing and building high-load, event-driven microservices on ASP.NET Core, Apache Kafka and AWS for e-commerce, payments, iGaming and healthcare platforms. Owns services end to end: system design, API contracts, messaging, data modelling, CI/CD and production operations. At Global-e built the Checkout API microservice from scratch for a cross-border e-commerce platform, a Spreedly-based payment-processor integration layer that cut new-provider onboarding from 1?2 months to 1 day, and migrated 200,000 live subscriptions with no customer-visible downtime. Consistent record of measurable outcomes: ?80% new-service bootstrap time via platform-wide templates, an integration generating 30% of a sportsbook's GGR, test coverage raised from 20% to 85%. Runs an AI-native engineering workflow ? spec-driven development, Claude Code, Cursor, custom MCP servers against the codebase ? which keeps delivery density well above a standard senior baseline.


TECHNICAL SKILLS

  • Languages & Frameworks: C#, .NET 8, .NET 6, .NET Core, ASP.NET Core, ASP.NET Core Web API, Minimal APIs, TypeScript, JavaScript, T-SQL, SQL
  • Architecture & System Design: Microservices, Distributed Systems, Event-Driven Architecture, Domain-Driven Design (DDD), CQRS, SAGA pattern, Clean Architecture, REST API design, gRPC, idempotency, resilience patterns (retries, circuit breakers), scalability, high-load systems, performance optimization, system design, SOLID, design patterns
  • Messaging & Streaming: Apache Kafka, RabbitMQ, MassTransit, AWS SQS / SNS, Azure Service Bus, publish / subscribe, asynchronous processing
  • Cloud & DevOps: AWS (EKS, SQS, SNS, S3, RDS, Secrets Manager), Microsoft Azure, Azure Functions, Kubernetes, Docker, Terraform, Linux, CI/CD, GitHub Actions, Azure DevOps, GitLab CI/CD, Jenkins, Git
  • Data & Storage: PostgreSQL, Microsoft SQL Server, Entity Framework Core (EF Core), Dapper, LINQ, query optimization, schema migrations, MongoDB, Couchbase, Redis, Memcached, Elasticsearch, NoSQL, caching
  • Backend Services & Security: MediatR, Hangfire, SignalR / WebSockets, OpenAPI / Swagger, IdentityServer, OAuth 2.0, OpenID Connect, JWT, async / await, multithreading, concurrency
  • Observability & Reliability: OpenTelemetry, distributed tracing, Datadog, Serilog, structured logging, Grafana, health checks, production incident response
  • Testing & Quality: xUnit, NUnit, Moq, TDD, unit testing, integration testing, SpecFlow / BDD, test automation, code review, Postman
  • Payments & Commerce: payment gateway integration, Spreedly, PayPal, CyberSource, Apple Pay, 3DS / SCA, checkout and cart, order orchestration, recurring billing, subscription management, refunds
  • Frontend: React, TypeScript, JavaScript, Blazor, Angular, HTML, CSS
  • Practices: Agile, Scrum, Kanban, Jira, Confluence, technical documentation, estimation and decomposition, requirements gathering, mentoring, stakeholder communication
  • AI Engineering: Claude Code, Cursor, GitHub Copilot, spec-driven development, Model Context Protocol (MCP) servers, agent skills, AI-assisted code review


ADDITIONAL INFORMATION

  • Domain expertise: e-commerce checkout and cart, payments and subscription billing, iGaming and sportsbook, healthcare, robotic process automation.
  • Strengths: event-driven system design, high-load microservices on AWS, platform tooling that raises other engineers' throughput, direct customer and stakeholder communication, mentoring.

Programmiersprachen

C#
Experte
JavaScript
Fortgeschritten
SQL
Experte

Branchen

Branchen

  • E-Commerce
  • HealthCare
  • iGaming/Gambling/SportsBook
  • Robotic Process Automation

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

2 years
2024-10 - now

Cross-border e-commerce platform | high-load event-driven microservices | Checkout, Cart & Payments domain

Senior .NET Engineer ? Global-e C# .NET 8 .NET 6 ...
Senior .NET Engineer ? Global-e
  • Designed and built the Checkout API microservice from scratch on ASP.NET Core, Apache Kafka and Couchbase, serving every checkout flow of the platform ? one-page, Shopify and standard checkout ? under high-volume cross-border traffic; led its zero-downtime cutover with no feature freeze.
  • Built a payment-processor integration layer on Spreedly that cut onboarding of a new payment provider (PayPal, CyberSource and others) from 1?2 months to 1 day; delivered Apple Pay and 3DS / SCA flows, with Datadog monitors in Terraform for transaction metrics.
  • Migrated 200,000 subscriptions and 800,000 subscription items ? six years of production data ? onto a new subscription service with no customer-visible downtime.
  • Developed an Order SAGA on MassTransit and AWS SQS / SNS for distributed transactional consistency, and built the Cart service owning checkout and recurring orders.
  • Created API and background-worker microservice templates that cut new-service bootstrap time by 80% and became the platform standard, adopted by every Scrum team.
  • Contributed to the internal Couchbase, Kafka and RabbitMQ SDKs used across all teams; built the checkout test automation framework (Page Object Model).
C# .NET 8 .NET 6 .NET Core ASP.NET Core ASP.NET Core Web API Minimal APIs TypeScript JavaScript T-SQL SQL Microservices Distributed Systems Event-Driven Architecture Domain-Driven Design (DDD) CQRS SAGA pattern Claude Code Cursor
Global-E
Remote, Warsaw, Poland
1 year
2023-11 - 2024-10

High-load iGaming platform | microservices-based casino and sportsbook

Senior .NET Engineer C# .NET 8 .NET 6 ...
Senior .NET Engineer
  • Led the sportsbook?bonus-provider integration end to end, from requirements to production, enabling bonuses on sports betting across the platform.
  • Delivered the RaceBook horse-racing integration that went on to generate 30% of total sportsbook GGR; integrated a third-party sportsbook SPA, saving 500?700% versus building in-house.
  • Handled 20+ live production incidents on a real-money betting platform, containing revenue impact in real time.
  • Decomposed and estimated the deposit-cashback epic, wrote user stories and gathered requirements directly from the product owner and customers.
C# .NET 8 .NET 6 .NET Core ASP.NET Core ASP.NET Core Web API Minimal APIs Microservices Distributed Systems Event-Driven Architecture Domain-Driven Design (DDD) CQRS PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core) OpenTelemetry distributed tracing payment gateway integration
TechTellent
Remote
2 years 4 months
2021-08 - 2023-11

Built a gRPC service

.NET Engineer PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core) ...
.NET Engineer
  • Built a gRPC service for insurance companies from scratch ? 12 companies onboarded in the first month after release.
  • Delivered permission-based premium subscriptions, purchased by 30%+ of users within 6 months.
  • Built 50+ reusable Blazor components, eliminating 8,000+ lines of duplicated code across the admin platform.
  • Extended the Symptom Checker web API, delivered 4 data migrations from doctor-supplied Excel data, and optimized Entity Framework queries and schema migrations.
PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core) Dapper LINQ query optimization schema migrations Agile Scrum Kanban Jira Confluence technical documentation estimation and decomposition Hangfire RabbitMQ MassTransit ASP.NET Core gRPC Angular Blazor
Mark, Personal Medical Assistant / Healthcare startup
Remote
1 year 10 months
2019-11 - 2021-08

Cloud Robotic Process Automation (RPA) platform | React and ASP.NET Core microservices

Fullstack .NET Engineer OpenAPI / Swagger IdentityServer OAuth 2.0 ...
Fullstack .NET Engineer
  • Designed a task-transition graph predicting digital-worker availability, lifting robot efficiency from 20?25% to 65?70%.
  • Raised microservice test coverage from 20% to 85%, cutting 2?6 working hours off each feature delivery.
  • Delivered a migration tool spanning 3 application versions and 15 databases, and a large epic integrating the web API microservice with the scheduling subsystem.
  • Built SpecFlow / BDD test infrastructure and optimized T-SQL and Entity Framework queries; mentored a trainee to junior level and lectured OOP and UML to interns, 30% of whom were hired.
OpenAPI / Swagger IdentityServer OAuth 2.0 OpenID Connect JWT async / await multithreading concurrency Azure Service Bus publish / subscribe asynchronous processing C# .NET 8 .NET 6 .NET Core ASP.NET Core ASP.NET Core Web API PostgreSQL Microsoft SQL Server Entity Framework Core (EF Core)
NIX Solutions
Kharkiv, Ukraine

Aus- und Weiterbildung

Aus- und Weiterbildung

3 years 9 months
2020-09 - 2024-05

BSc, Computer Science ? Software Engineering

Bachelor, Kharkiv National University of Radio Electronics, Ukraine
Bachelor
Kharkiv National University of Radio Electronics, Ukraine

  • Computer Science
  • Backend Development
  • Software Engineering
  • Project Management
  • Algorithms and Data Structures
  • Business English
  • Software Development

Position

Position

Senior .NET Engineer building high-load, event-driven microservices on ASP.NET Core, Kafka and AWS ? 7 years across e-commerce checkout, payments, iGaming and healthcare. I own services end to end: system design, API contracts, messaging, data, CI/CD and production.

WHAT I DO

- Distributed systems: event-driven architecture, DDD, CQRS, SAGA, idempotency and resilience patterns on Kafka, RabbitMQ and MassTransit

- Cloud-native .NET on AWS (EKS, SQS/SNS, S3, RDS) and Kubernetes ? services that run under real cross-border e-commerce traffic

- Platform leverage: service templates, internal SDKs, test automation ? the infrastructure that makes every other engineer on the team faster

SELECTED RESULTS

- Designed and built the Checkout API microservice from scratch for a cross-border e-commerce platform (ASP.NET Core, Kafka, Couchbase) and led its zero-downtime cutover

- Built a Spreedly-based payment-processor integration layer that cut new-provider onboarding (PayPal, CyberSource) from 1?2 months to 1 day

- Migrated 200K subscriptions / 800K subscription items ? six years of production data ? with no customer-visible downtime

- Cut new microservice bootstrap time by 80% with API + worker templates adopted by every Scrum team

- Delivered a sportsbook integration that now generates 30% of total GGR on a real-money iGaming platform

- Raised microservice test coverage from 20% to 85%, cutting 2?6 hours off every feature delivery

- Lifted RPA digital-worker efficiency from 20?25% to 65?70% with a task-transition prediction graph

HOW I WORK

AI-native engineering workflow: spec-driven development, Claude Code and Cursor, custom MCP servers against the codebase, AI-assisted code review. Async-first ? written specs, decisions in writing, deep-work blocks in between. That's why the output density is what it is.

STACK

C# / .NET 8 · ASP.NET Core · Kafka, RabbitMQ, MassTransit · AWS (EKS, SQS/SNS, S3, RDS), Azure, Kubernetes, Docker · PostgreSQL, MS SQL, MongoDB, Couchbase, Redis, Elasticsearch · gRPC, REST, SignalR · OpenTelemetry, Grafana · React, TypeScript, Blazor

Based in Warsaw, CET ? full overlap with the European working day. Polish sole proprietorship (B2B): I invoice EU clients directly under reverse charge, no EOR needed.

English B2 (British Council). [URL by request]

Kompetenzen

Kompetenzen

Top-Skills

C# ASP.NET Microservices Kafka PostgreSQL MS SQL Server SQL Distributed Systems AWS Kubernetes Domain Driven Design .NET 4.6 .NET Framework JavaScript RabbitMQ System Design Docker REST API gRPC Payment Systems E-Commerce CI/CD Event-Driven Architecture

Produkte / Standards / Erfahrungen / Methoden

PROFESSIONAL SUMMARY

Senior .NET Engineer with 7 years designing and building high-load, event-driven microservices on ASP.NET Core, Apache Kafka and AWS for e-commerce, payments, iGaming and healthcare platforms. Owns services end to end: system design, API contracts, messaging, data modelling, CI/CD and production operations. At Global-e built the Checkout API microservice from scratch for a cross-border e-commerce platform, a Spreedly-based payment-processor integration layer that cut new-provider onboarding from 1?2 months to 1 day, and migrated 200,000 live subscriptions with no customer-visible downtime. Consistent record of measurable outcomes: ?80% new-service bootstrap time via platform-wide templates, an integration generating 30% of a sportsbook's GGR, test coverage raised from 20% to 85%. Runs an AI-native engineering workflow ? spec-driven development, Claude Code, Cursor, custom MCP servers against the codebase ? which keeps delivery density well above a standard senior baseline.


TECHNICAL SKILLS

  • Languages & Frameworks: C#, .NET 8, .NET 6, .NET Core, ASP.NET Core, ASP.NET Core Web API, Minimal APIs, TypeScript, JavaScript, T-SQL, SQL
  • Architecture & System Design: Microservices, Distributed Systems, Event-Driven Architecture, Domain-Driven Design (DDD), CQRS, SAGA pattern, Clean Architecture, REST API design, gRPC, idempotency, resilience patterns (retries, circuit breakers), scalability, high-load systems, performance optimization, system design, SOLID, design patterns
  • Messaging & Streaming: Apache Kafka, RabbitMQ, MassTransit, AWS SQS / SNS, Azure Service Bus, publish / subscribe, asynchronous processing
  • Cloud & DevOps: AWS (EKS, SQS, SNS, S3, RDS, Secrets Manager), Microsoft Azure, Azure Functions, Kubernetes, Docker, Terraform, Linux, CI/CD, GitHub Actions, Azure DevOps, GitLab CI/CD, Jenkins, Git
  • Data & Storage: PostgreSQL, Microsoft SQL Server, Entity Framework Core (EF Core), Dapper, LINQ, query optimization, schema migrations, MongoDB, Couchbase, Redis, Memcached, Elasticsearch, NoSQL, caching
  • Backend Services & Security: MediatR, Hangfire, SignalR / WebSockets, OpenAPI / Swagger, IdentityServer, OAuth 2.0, OpenID Connect, JWT, async / await, multithreading, concurrency
  • Observability & Reliability: OpenTelemetry, distributed tracing, Datadog, Serilog, structured logging, Grafana, health checks, production incident response
  • Testing & Quality: xUnit, NUnit, Moq, TDD, unit testing, integration testing, SpecFlow / BDD, test automation, code review, Postman
  • Payments & Commerce: payment gateway integration, Spreedly, PayPal, CyberSource, Apple Pay, 3DS / SCA, checkout and cart, order orchestration, recurring billing, subscription management, refunds
  • Frontend: React, TypeScript, JavaScript, Blazor, Angular, HTML, CSS
  • Practices: Agile, Scrum, Kanban, Jira, Confluence, technical documentation, estimation and decomposition, requirements gathering, mentoring, stakeholder communication
  • AI Engineering: Claude Code, Cursor, GitHub Copilot, spec-driven development, Model Context Protocol (MCP) servers, agent skills, AI-assisted code review


ADDITIONAL INFORMATION

  • Domain expertise: e-commerce checkout and cart, payments and subscription billing, iGaming and sportsbook, healthcare, robotic process automation.
  • Strengths: event-driven system design, high-load microservices on AWS, platform tooling that raises other engineers' throughput, direct customer and stakeholder communication, mentoring.

Programmiersprachen

C#
Experte
JavaScript
Fortgeschritten
SQL
Experte

Branchen

Branchen

  • E-Commerce
  • HealthCare
  • iGaming/Gambling/SportsBook
  • Robotic Process Automation

Vertrauen Sie auf Randstad

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Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

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Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

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