Freelancer profile translated to English.
Back to original languageAbout Nicolas
Experienced Software Engineer in Financial Solutions and Technological Innovation
I am a specialized software engineer, with a degree in software engineering and a specialization in business intelligence, as well as an AWS Solution Architect Associate certification. With over 7 years of experience, I have contributed to major projects in the financial sector, notably for FNZ, Thrive Alternatives, Northmill Bank, and Qonto.
Key Achievements:
During my assignment at Qonto, I built the acceptance platform, an Event-Driven system using Event Sourcing and the CQRS pattern to make decisions about our clients transparent and auditable.
At Thrive and Northmill, I implemented DDD principles to optimize processes and focus on the most critical areas. I also adopted a TDD approach to ensure maximum stability and scalability.
My back-end expertise with Node.js and C#, combined with my DevOps skills, allows me to deliver robust and scalable solutions. My AWS certification and experience in optimizing cloud architecture have significantly reduced costs for my clients.
My time in Shanghai was a turning point, providing me with a deep understanding of business dynamics and enabling me to develop a technical approach focused on adding value to businesses.
What I bring to you:
Specialized technical expertise in the financial and banking sector, with a strong understanding of business and product needs.
Ability to deliver products quickly thanks to my mastery of DevOps and Cloud Computing.
Contact me for tailor-made software solutions that will propel your business forward. Let's discuss your needs and how we can collaborate to achieve your goals.
French
Native or bilingual
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- QontoSenior Software EngineerBANKING AND INSURANCEFebruary 2026 - Today (6 months)Paris, FranceSenior software engineer with experience at Qonto, one of Europe's most demanding B2B fintechs, where I worked at the core of regulatory compliance systems: KYC, KYB, screening, and periodic review management.At Qonto, I contributed to the design and delivery of critical customer acceptance features: from automated onboarding flows to periodic review processes, including the integration of AML screening providers. These areas, at the intersection of regulatory and engineering, demand technical rigor: zero tolerance for regressions, auditable decisions, and absolute reliability of data pipelines.My primary stack is Ruby on Rails and Go, in high-traffic microservices environments. I contributed to improving the quality and performance of existing systems by refactoring legacy services, reducing technical debt, and optimizing processing times, while maintaining solid test coverage and clear documentation.I am proficient in the specific challenges of distributed architectures: data consistency between services, asynchronous event management, design of robust internal APIs, Event-Driven Architecture, Event Sourcing, and observability.
- Northmill BankSenior Software EngineerBANKING AND INSURANCESeptember 2023 - December 2025 (2 years and 3 months)Stockholm, SwedenAs a senior software engineer, I play a key role in the development of Northmill AB's banking platform and specialize in the development and management of the day-to-day banking section (current accounts, deposit accounts, bank cards, etc.).Leveraging my expertise with AWS, MySQL, C# .NET, and NodeJS, I have designed numerous application features for this bank's clients, such as current and business deposit accounts, Buy-Now Pay-Later systems, and helped improve user engagement and application security.Stack:| Backend Development: C#.NET, Node.js (TypeScript)| Frontend Development: React.js (JavaScript)| Cloud: Amazon Web Services (AWS)| Other: Event-Driven Architecture, DevOps, etc.
- Thrive AltsSenior Back-End DeveloperSOFTWARE PUBLISHINGFebruary 2022 - Today (4 years and 6 months)Shanghai, ChinaAs a senior back-end developer, I played a key role in the development of Drive, a financial CRM SaaS designed for GPs (General Partners) to raise funds.Leveraging my expertise with Typescript, AWS, MySQL, GraphQL, and NodeJS, I led the development of numerous application features to make it robust and scalable, I also optimized its performance, reduced its costs, and helped improve user engagement.Among the features I participated in: custom fields, a complex email campaign system, cross-searches, and an investor recommendation algorithm that played a key role in the application's success.In addition to my development contributions, I mentored junior team members, providing them with guidance on architectural design and the internal development of our stack. This helped increase overall velocity and efficiency, leading to a successful project.Stack:| Backend Development: Node.js (TypeScript), MySQL, MariaDB, GraphQL, AppSync, NoSQL (DynamoDB)| Frontend Development: React.js (TypeScript)| Cloud: Amazon Web Services (AWS)| Other: Event-Driven Architecture, DevOps, etc.
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Education
- Ingénieur Informatique, spécialité Bases de données et LogicielsUniversité de Technologie de Belfort-Montbéliard2019Apprentissage des compétences relatives au domaine de l'ingénierie informatique et à la culture DevOps. Je me suis orienté dans une filière logicielle et au développement informatique à l'aide de langages tels que Java, JavaScript (NodeJS) ou encore Python. J'ai par exemple pu développer une simulation de trafic routier avec un paradigme multi-agents en Java et du framework Spring. Un autre projet important, développé en Python pour le backend et Java pour le frontend, a consisté à une analyse de corpus de texte à l'aide de techniques de NLP (Natural Language Processing) avancé. Enfin un dernier projet, basé sur les technologies VueJS en Frontend et Java Spring en Backend consistait à l'exploration et l'exploitation de bases de données publiques. | Développement Backend : Java (Spring), Python, NodeJS | Développement Frontend : VueJS, ReactJS, Java (Swing) | Intelligence Artificielle : TensorFlow, Scikit | Bases de données : NoSQL - MongoDB, DynamoDB, SQL - MySQL, PostgreSQL | Autres : DevOps, Gestion de projet, Algorithmie avancée, Design Patterns
- DUT MMI - Métiers du Multimédia et de l'InternetInstitut Universitaire de Technologie de Mulhouse2016Apprentissage des compétences relatives au domaine du développement web et de l'algorithmique avec Java. J'ai pu mener à bien de nombreux projets web étudiants, la plupart sur des technologies telles que PHP, JavaScript (Jquery, D3js, NodeJS) et m'initier à la gestion de projet. Cette expérience m'a notamment permis de lancer ma carrière de freelance en développement web et développeur Java. | Développement Backend : Java, PHP (CakePHP), NodeJS | Développement Frontend : JavaScript (JQuery, D3js), Java (Swing) | Autre : Graphisme (Photoshop, Illustrator, InDesign), Gestion de projet
Certifications
- AWS Cloud Solution Architect AssociateAmazon Web Services2020
- AWS Cloud PractitionerAmazon Web Services2020