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Hello! I’m Antonios Klimis, a senior software engineer and architect with over 20 years building complex, event-driven systems across logistics, insurance, banking, and trading. I specialise in event-sourced architectures, CQRS, and DDD in C# on Azure and Cloudflare, and I lead an AI-augmented engineering practice that combines practical software delivery with agent-based AI workflows. I love solving hard integration challenges, building scalable platforms, and mentoring teams to ship robust software. My experience spans payments orchestration (Stripe, GoCardless), post-payments reconciliation, identity and security, and modern cloud infrastructure (AKS, Kubernetes, Terraform, CI/CD). I’m passionate about engineering discipline, open-source patterns, and continuous learning.…Hello! I’m Antonios Klimis, a senior software engineer and architect with over 20 years building complex, event-driven systems across logistics, insurance, banking, and trading. I specialise in event-sourced architectures, CQRS, and DDD in C# on Azure and Cloudflare, and I lead an AI-augmented engineering practice that combines practical software delivery with agent-based AI workflows. I love solving hard integration challenges, building scalable platforms, and mentoring teams to ship robust software. My experience spans payments orchestration (Stripe, GoCardless), post-payments reconciliation, identity and security, and modern cloud infrastructure (AKS, Kubernetes, Terraform, CI/CD). I’m passionate about engineering discipline, open-source patterns, and continuous learning.

Antonios Klimis

Full Stack Developer, Back-End Developer, Architect, +2

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Hello! I’m Antonios Klimis, a senior software engineer and architect with over 20 years building complex, event-driven systems across logistics, insurance, banking, and trading. I specialise in event-sourced architectures, CQRS, and DDD in C# on Azure and Cloudflare, and I lead an AI-augmented engineering practice that combines practical software delivery with agent-based AI workflows. I love solving hard integration challenges, building scalable platforms, and mentoring teams to ship robust software. My experience spans payments orchestration (Stripe, GoCardless), post-payments reconciliation, identity and security, and modern cloud infrastructure (AKS, Kubernetes, Terraform, CI/CD). I’m passionate about engineering discipline, open-source patterns, and continuous learning.…Hello! I’m Antonios Klimis, a senior software engineer and architect with over 20 years building complex, event-driven systems across logistics, insurance, banking, and trading. I specialise in event-sourced architectures, CQRS, and DDD in C# on Azure and Cloudflare, and I lead an AI-augmented engineering practice that combines practical software delivery with agent-based AI workflows. I love solving hard integration challenges, building scalable platforms, and mentoring teams to ship robust software. My experience spans payments orchestration (Stripe, GoCardless), post-payments reconciliation, identity and security, and modern cloud infrastructure (AKS, Kubernetes, Terraform, CI/CD). I’m passionate about engineering discipline, open-source patterns, and continuous learning.

Available to hire

Hello! I’m Antonios Klimis, a senior software engineer and architect with over 20 years building complex, event-driven systems across logistics, insurance, banking, and trading. I specialise in event-sourced architectures, CQRS, and DDD in C# on Azure and Cloudflare, and I lead an AI-augmented engineering practice that combines practical software delivery with agent-based AI workflows.

I love solving hard integration challenges, building scalable platforms, and mentoring teams to ship robust software. My experience spans payments orchestration (Stripe, GoCardless), post-payments reconciliation, identity and security, and modern cloud infrastructure (AKS, Kubernetes, Terraform, CI/CD). I’m passionate about engineering discipline, open-source patterns, and continuous learning.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Greek, Modern

Fluent

English

Fluent

Work Experience

Senior Software Engineer / Architect at ParcelVision Ltd

October 1, 2019 - April 1, 2026

Led the event-sourced logistics platform on Azure; built the payments orchestration with Stripe, GoCardless, and internal wallet; implemented post-payments reconciliation, Xero sync, invoice generation/export, and finance reporting from event-sourced streams. Introduced CI/CD for greenfield work, restructured projects, externalised config, and implemented end-to-end automated deploys (TeamCity + Octopus Deploy). Built ParcelVision's custom .NET build system (per-BC targets) and co-owned AKS/Kubernetes infrastructure (Helm, Grafana, Prometheus). Authored an event-sourcing library wrapping EventStore DB v5/v20 and integrated IdentityServer, Redis data protection, refresh token rotation, and multi-tenant claims.

Senior Software Engineer at Try it with Ann

February 1, 2025 - December 1, 2025

Real-time collaborative platform for executable specifications. Built Specification by Example Editor (React + Redux + MVU SPA) and the Ann Miro plugin editing/context-mapping layers, including editing events, commands, policies, and JSON Schema contracts. Developed cross-service JSON Schema contract system, exporting TypeScript and Kotlin tests.

Senior Software Engineer / Architect at RExDen AI

June 1, 2025 - Present

Co-founded the platform; led engineering for trading indicator suite. Shipped Rex indicator suite on TradingView (Pine Script), built Cloudflare Workers + D1 + Durable Objects, React frontend, Auth0 passwordless, and Lemon Squeezy subscriptions with webhook-driven tier resolution. Implemented authenticated TradingView alert pipeline with Discord/Telegram fan-out. Developed an LLM/agent-engineering practice on Claude Code with MCP servers and sub-agent orchestration; shipped Rex Scout (lead classification) and a Claude-based market sentiment classifier.

Senior Software Engineer / Architect at CORE BV

November 1, 2025 - January 31, 2026

Built CPQ3D greenfield platform alongside the founder; API + customer/admin portal on Cloudflare (Workers, per-org D1, R2, Queues, Workflows). Implemented multi-tenant domain model, tenant-based impersonation for support, and a compatibility layer to migrate from legacy .NET servers (URL redirects, backward-compatible Auth0 validation).

Staff Software Engineer at LULA

July 1, 2022 - November 30, 2022

Backend work on next-generation insurance infrastructure platform; F#, ASP.NET Core, EventStoreDB, event-sourced microservices. Full-stack / Back-end / Senior Engineer responsibilities across product domains.

Senior Software Engineer at BeWise

January 1, 2018 - December 31, 2019

Worked on electricity retail and sports apps; .NET Core, React; contributed across multiple product lines in BeWise’s tech stack during the 2018-2019 period.

Software Engineer at Intralot

January 1, 2014 - December 31, 2018

Product Owner for Lottery and related product lines; led development across gaming domains; .NET/C# and frontend work.

Software Engineer at EchoFin

January 1, 2018 - December 31, 2018

Event-driven consulting engagements focusing on distributed systems and data pipelines.

Senior Software Engineer at Intracom

September 1, 2001 - October 31, 2019

Core banking, PROFITS, iComPay projects; .NET stack, SQL/Oracle databases; large-scale enterprise systems.