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Hi there! I'm Lukas Hassan, a Senior Software Engineer with over 10 years of experience building fintech-grade backend systems and APIs. I specialize in checkout flows, embedded finance infrastructure, and distributed services across fintech, banking, and AI-enabled platforms. I enjoy designing robust architectures, improving observability, and collaborating with product and data teams to deliver reliable, scalable solutions. Outside work, I enjoy learning new tech, mentoring peers, and turning complex problems into clean code.…Hi there! I'm Lukas Hassan, a Senior Software Engineer with over 10 years of experience building fintech-grade backend systems and APIs. I specialize in checkout flows, embedded finance infrastructure, and distributed services across fintech, banking, and AI-enabled platforms. I enjoy designing robust architectures, improving observability, and collaborating with product and data teams to deliver reliable, scalable solutions. Outside work, I enjoy learning new tech, mentoring peers, and turning complex problems into clean code.

Lukas Hassan

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

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Hi there! I'm Lukas Hassan, a Senior Software Engineer with over 10 years of experience building fintech-grade backend systems and APIs. I specialize in checkout flows, embedded finance infrastructure, and distributed services across fintech, banking, and AI-enabled platforms. I enjoy designing robust architectures, improving observability, and collaborating with product and data teams to deliver reliable, scalable solutions. Outside work, I enjoy learning new tech, mentoring peers, and turning complex problems into clean code.…Hi there! I'm Lukas Hassan, a Senior Software Engineer with over 10 years of experience building fintech-grade backend systems and APIs. I specialize in checkout flows, embedded finance infrastructure, and distributed services across fintech, banking, and AI-enabled platforms. I enjoy designing robust architectures, improving observability, and collaborating with product and data teams to deliver reliable, scalable solutions. Outside work, I enjoy learning new tech, mentoring peers, and turning complex problems into clean code.

Available to hire

Hi there! I’m Lukas Hassan, a Senior Software Engineer with over 10 years of experience building fintech-grade backend systems and APIs. I specialize in checkout flows, embedded finance infrastructure, and distributed services across fintech, banking, and AI-enabled platforms.

I enjoy designing robust architectures, improving observability, and collaborating with product and data teams to deliver reliable, scalable solutions. Outside work, I enjoy learning new tech, mentoring peers, and turning complex problems into clean code.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Work Experience

Senior Software Engineer at Klarna

March 1, 2024 - Present

Built backend services for checkout, BNPL workflows, and merchant-facing APIs; improved payment state tracking, retry workflows, and event handling across checkout systems; contributed to internal tooling and reliability-focused engineering.

Backend Engineer at Stripe

July 2, 2022 - February 2, 2024

Worked on backend infrastructures for ACH payments processing, payout tracking, and payment services; implemented fraud monitoring and event-driven processing; collaborated with platform and ML teams; improved deployment automation and reliability.

Senior Backend Engineer at Klarna

April 2, 2020 - June 2, 2022

Drove backend APIs to support payment workflows, customer transactions, and embedded finance capabilities; contributed to reliability improvements, observability, and architecture discussions across payment systems.

Senior Backend Engineer at Northern Bank

September 2, 2018 - March 2, 2020

Built backend APIs supporting payment workflows, customer transaction services, and operational banking systems. Implemented fraud monitoring and transaction event processing; improved deployment reliability via automation.

Senior Backend Engineer

June 2, 2014 - August 2, 2018

Worked on backend services supporting digital payments infrastructure in a fintech context. Implemented payment workflows, transaction processing, and core API layers; collaborated with cross-functional teams to enable reliable and scalable payments capabilities.