10/19/2026 updated

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Senior .NET Engineer & Tech Lead | C#, Azure, AWS, Angular | 15+ years experience

Iasi, Romania
Only remote
M.Sc. Distributed Systems & Web Technologies, B.Sc. Computers & IT (TU Iasi)
Iasi, Romania
Only remote
M.Sc. Distributed Systems & Web Technologies, B.Sc. Computers & IT (TU Iasi)

Profile attachments

Alexandru-Dan_Maftei_References.pdf
Alexandru-Dan_Maftei_CV_2026.pdf

About me

Senior .NET engineer and tech lead, contracting since 2018 for clients in Ireland, the UK, Canada and Malta. I take ownership of slow, unstable or legacy systems and make them reliable and fast. Calm, independent, used to working directly with product and business stakeholders.

Azure FunctionsAzure DevOpsASP.NET.NET FrameworkAmazon Web ServicesMicrosoft AzureC Sharp (Programming Language)Cloud EngineeringContinuous DeliveryContinuous IntegrationEntity FrameworkPostgreSQLMicrosoft SQL ServersAzure SQLRabbitMQRedisAngular 2+TypeScriptAzure Service Bus.NET CoreEvent-driven ArchitectureReact.jsBackendKubernetesApache KafkaCosmos DBWeb TechnologiesRestful ApiDomain Driven DesignDockerWeb ApiMicroservices
Senior .NET engineer and technical lead with 15+ years of experience, contracting since 2018 for companies in Ireland, the UK, Canada and Malta. Based in Iasi, Romania (EU), working remotely on UK/EU hours, available immediately for B2B contracts.

I take ownership of slow, unstable, legacy or loosely defined products and make them reliable, modern and fast, working directly with product and business stakeholders. Domains: healthcare, insurance, fintech, e-commerce, iGaming and executive search.

Selected results:
- Cut processing of healthcare claims files of up to 4 million rows from ~15 hours to under 2 minutes (8 West Consulting).
- Single-handedly upgraded a global employee-benefits platform from .NET 6 / Angular 14 to .NET 10 / Angular 21 (TELUS Health).
- Designed the architecture for an AI companion platform with real-time streaming from Python AI services through a .NET backend (TELUS Health).
- Reduced new-customer invoicing setup from up to two weeks to about one hour (ESW).
- Brought search and aggregation over ~30 million records under 5 seconds; promoted to Technical Team Lead (Spencer Stuart).

Core skills:
- Backend: C#, .NET 10 / .NET Core / .NET Framework, ASP.NET Core, Web API, Entity Framework Core, Dapper, WCF, Hangfire, Microsoft Orleans
- Architecture: distributed systems, microservices, event-driven architecture, CQRS, event sourcing, DDD, transactional outbox, REST, gRPC, SignalR
- Messaging & data: Kafka, RabbitMQ, MassTransit, Azure Service Bus, SQL Server, Cosmos DB, DynamoDB, PostgreSQL, Redis
- Cloud & DevOps: Azure (Functions, Durable Functions, Key Vault, Application Insights, Azure DevOps), AWS (S3, DynamoDB, Fargate, EC2, Bedrock), Docker, Kubernetes, OpenShift, ArgoCD, CI/CD
- Frontend: Angular, TypeScript, RxJS, React
- AI: Semantic Kernel, AWS Bedrock, RAG, hybrid search, LLM streaming; daily use of Claude Code, Codex, Cursor and GitHub Copilot
- Quality: NUnit, Moq, integration testing, TDD, SonarQube, Grafana, Prometheus
- Leadership: team lead and co-lead, technical interviews, code reviews, mentoring, Agile/Scrum

M.Sc. Distributed Systems and Web Technologies. Microsoft Certified Professional. English: advanced.

Experience

Professional experience10+ years
Freelancer since2018

Languages

EnglishFluentRomanianNative speaker

Project history

Senior .NET Full Stack Engineer (contract, fully remote)

TELUS Health

Pharmaceuticals & Medical Technology

Global employee engagement and benefits platform (ASP.NET MVC / Web API, EF Core, SQL, Hangfire, Angular, AWS).
- Single-handedly upgraded the platform from .NET 6 / Angular 14 to .NET 10 / Angular 21, off end-of-support frameworks, using an AI-assisted migration workflow.
- Designed resilient integrations with external insurance providers using the transactional outbox pattern.
- Designed the architecture for an AI companion platform: service contracts between the .NET backend and Python FastAPI AI services, real-time NDJSON streaming to the UI.
- Stabilised the product (defect backlog, fragile areas, calendar workflow redesign) as the team grew from three to around eight engineers.
- Introduced integration tests on every CircleCI build; refactored YAML pipelines and added build caching.

Senior .NET Full Stack Engineer (contract, fully remote)

FintechIO

Insurance

London-based fintech consultancy; insurance workflow platform for underwriters, reporting directly to the CTO.
- Introduced a hybrid caching library on .NET distributed caching and Redis, with Redis pub/sub for cross-instance cache eviction.
- Moved critical workflow-creation logic into Azure Durable Functions; designed and optimised workflows.
- Built an audit framework capturing user actions from the Angular frontend to the .NET backend.
- Built an AI company-intelligence solution with Semantic Kernel, later integrated with Perplexity.
- Nightly Azure DevOps pipeline versioning archived financial models in Git.
Tech: C#, .NET 9, EF Core, SQL, Azure Functions, Durable Functions, Service Bus, Redis, Key Vault, Azure DevOps, Angular

Senior .NET Full Stack Engineer (contract, fully remote)

Rakuten Kobo

Internet & IT

Global ebook and audiobook store; high-traffic, microservices-based customer web platform.
- Built the Collections feature of the kobo.com customer library end to end (backend, frontend, translations, responsive design).
- Optimised critical customer workflows and fixed defects to improve stability.
- Improved accessibility: ARIA screen-reader support, keyboard navigation, colour contrast.
Tech: C#, .NET Core, ASP.NET, microservices, CQRS, RabbitMQ, NHibernate, SQL

Technical Lead (contract, fully remote)

Gaming Innovation Group (GiG)

Internet & IT

iGaming platform and sportsbook provider; one of two Technical Leads across two development teams.
- Co-led two teams, sharing ownership of technical direction, design decisions and code quality; mentored engineers.
- Delivered Sports Bonus Wagering Management and multiple B2B partner integrations.
- Led migration of legacy products to Kubernetes / Red Hat OpenShift with GitOps (ArgoCD, Kustomize).
- Built a Redis connection-pool manager adopted by all platform applications.
Tech: C#, .NET 6/7, microservices, Kubernetes, OpenShift, ArgoCD, Redis, RabbitMQ, Kafka, Microsoft Orleans, Grafana, Prometheus

Senior .NET Full Stack Engineer (contract, fully remote)

8 West Consulting

Insurance

Multi-tenant healthcare claims adjudication system for a client.
- Designed a diff-based pre-processing stage for files of up to 4 million rows, cutting processing time from ~15 hours to under 2 minutes.
- Implemented new claims adjudication steps and supporting screens, including regulatory compliance changes.
Tech: C#, .NET, ASP.NET MVC, Web API, ADO.NET, SQL, WCF, Azure DevOps

Senior .NET Full Stack Engineer (contract, Dublin, hybrid)

Spencer Stuart

Other

Rehired for a third engagement on the internal consultant platform and client portals.
- Shaped architectural decisions and API design.
- Built search and aggregation over ~30 million records (Dapper, SOLR), with caching, bringing response times under 5 seconds.
Tech: C#, .NET Core, Web API, Dapper, SOLR, Docker, AWS Fargate, EC2, Angular, TypeScript

Senior .NET Full Stack Engineer (contract, remote)

ESW

Goods & Retail

Global cross-border e-commerce provider; microservices-based Azure platform (checkout, invoicing, VAT).
- Cut new-customer invoicing setup from up to two weeks of development to about one hour.
- Order-status dashboard in Application Insights: from up to a day to under a minute.
- Co-designed VAT invoice and credit-note generation with Confluent Kafka, documents in up to 5 seconds.
- Raised code coverage to 90% across team-owned applications; reduced Azure running costs.
Tech: C#, .NET Core, microservices, CQRS, Kafka, Cosmos DB, EF, SQL, Azure, Azure DevOps, Angular

Senior .NET Full Stack Engineer (contract, Dublin)

Spencer Stuart

Other

Rehired as a contractor on the consultant platform and client applications.
- Configuration-based dashboard and widget framework in Angular, cutting new dashboard build time from about two weeks to one day.
- Migrated suitable workloads from SQL Server to AWS DynamoDB, about 5x better performance.
Tech: C#, .NET Core, ASP.NET MVC, Web API, AWS S3, DynamoDB, NHibernate, SQL Server, Angular, TypeScript

Senior .NET Full Stack Engineer (contract, Dublin)

Verizon Connect

Transport & Logistics

Fleet and mobile workforce management; connected-vehicle platform.
- Helped design and build a new Angular application for vehicle and driver information and alerts.
- Built a reusable Web API shared by the Android and iOS apps, meeting all performance-test requirements.
Tech: C#, .NET Core, Web API, microservices, ADO.NET, AWS, Angular, SonarQube

Senior .NET Full Stack Engineer, then Technical Team Lead (permanent, Dublin)

Spencer Stuart

Other

Global executive search firm; internal consultant platform and client portals, from monolith to domain-based microservices. Promoted to Technical Team Lead after 21 months.
- Led a cross-functional team (up to four developers, two QA, a Product Owner) with close to zero production incidents.
- Owned end-to-end delivery of tools for consultants, working with stakeholders in Chicago.
- Ran technical interviews, code reviews, performance reviews, grooming and sprint planning.
- Reduced integration-test runs from 7 hours to 1 hour; cut profile-picture serving cost 4x by moving to AWS S3.
Tech: C#, .NET Framework, ASP.NET MVC, Web API, WCF, NHibernate, RabbitMQ, Redis, SignalR, SQL Server, AWS, AngularJS

Certificates

Certified SAFe 5 Practitioner

Scaled Agile, Inc.

2020

Microsoft Certified Professional

Microsoft

2013

Microsoft Programming in C# Specialist

Microsoft

2013

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