Alexandru Paun
Senior Full-Stack Developer
Aarhus/Hybrid
Summary
Experienced Full-Stack Software Engineer specializing in .NET development, API design, and microservices architecture. Proficient in creating secure, scalable, and high-performance systems utilizing C#, ASP.NET, React, and Node.js. Experienced in deployment through Docker and OpenShift. Currently contributing to the financial sector by delivering authentication solutions for a user base exceeding 2 million daily users. Demonstrated expertise in DevSecOps, CI/CD practices, and observability tools like Grafana. Actively pursuing AWS Cloud Practitioner certification while excelling in cross-functional collaboration and customer-facing solutions.
Overview
8
8
years of professional experience
4
4
Languages
Work History
Software Engineer
Danske Bank
09.2023 - Current
- Developing cloud-native, containerized backend services in C#, Node.js, and Python, deployed on OpenShift in private cloud environments.
- Building highly available, secure systems for customer authentication (MitID Broker, ASHE) used by over 2.2 million daily users, with a focus on low latency and high resilience.
- Actively contributing to system architecture, collaborating across teams to ensure observability, performance, and DevSecOps standards using tools like Grafana.
- Engaged in the design of event-driven architectures, including message queues and centralized authentication flows.
- Applying CI/CD, containerization, and security best practices in production environments.
- Actively working toward AWS Cloud Practitioner certification, enhancing cloud architecture proficiency and aligning with organizational cloud strategy.
- Collaborating closely with cross-functional teams in an agile setup, contributing to scalable, secure, and business-aligned solutions.
Backend Developer
Heyday A/S
01.2023 - 09.2023
- Led backend development for the SimplyGo car leasing platform in a full-stack .NET environment using C#, React (TypeScript), and .NET.
- Collaborated directly with stakeholders and customers to define and refine system requirements, ensuring technical feasibility and business alignment.
- Investigated, integrated, and tested external APIs from platforms such as Penneo, Salesforce, and AltaPay, contributing to a resilient and secure integration layer.
- Delivered production-ready features within a microservice-oriented architecture using Hangfire, Umbraco, and UCommerce.
- Focused on reliability, testability, and performance in customer-facing e-commerce systems.
- Applied CI/CD principles, version control (Git), and containerization practices throughout the SDLC.
Backend Developer
Playable
06.2022 - 01.2023
- Responsible for delivering scalable, testable, and performant microservices within a hybrid system architecture integrating PHP monoliths, Node.js REST APIs, and Vue 3 micro frontends.
- Designed and maintained services that handle 2,000+ requests per second using AWS resources, Docker, and CI/CD pipelines.
- Collaborated across teams to implement agile development processes, reducing time-to-market and supporting daily production deployments.
- Contributed to foundational work in Domain-Driven Design (DDD) and MACH architecture, promoting modularity and long-term scalability.
- Tech stack includes: PHP, JavaScript, TypeScript, Node.js, Vue.js, Redis, PostgreSQL, Docker, GitLab, AWS, Sentry, K6, and Laravel.
Junior Full-Stack Developer
EnviDan
02.2021 - 06.2022
Junior Software Developer
Convecto ApS
10.2019 - 11.2020
Software Developer Internship
TREAT Systems
01.2018 - 04.2019
Education
Master Degree - Computer Science
Aalborg University
09.2020 - 6 2021
Top-Up - Software Development, Computer Science
UCN
02.2019 - 6 2020
Top-Up - Computer Science
UCN
09.2016 - 1 2019
Skills
Full-Stack Net Development
undefinedInterests
Gaming (PC and Board Games)
Car Mechanics
Cycling
Gardening
Details
- Date of Birth: 18 September 1997
- Nationality: Romanian
Timeline
Software Engineer
Danske Bank
09.2023 - Current
Backend Developer
Heyday A/S
01.2023 - 09.2023
Backend Developer
Playable
06.2022 - 01.2023
Junior Full-Stack Developer
EnviDan
02.2021 - 06.2022
Master Degree - Computer Science
Aalborg University
09.2020 - 6 2021
Junior Software Developer
Convecto ApS
10.2019 - 11.2020
Top-Up - Software Development, Computer Science
UCN
02.2019 - 6 2020
Software Developer Internship
TREAT Systems
01.2018 - 04.2019
Top-Up - Computer Science
UCN
09.2016 - 1 2019
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