Principal Software Engineer – CSD Integration & Asset Servicing

Euronext; Paris; On-site; EUR 120,000 - 180,000; Full time

Job summary

Euronext is seeking a Principal Software Engineer to design and build the CSD capabilities connecting digital-asset apps to Euronext Securities. You will own the architecture for the CSD Integration, Asset Servicing & Reporting team, write production code, and review colleagues’ work.

You’ll shape the gateway interface, ensure resilience and observability, and drive integration with legacy platforms while coordinating with the tokenisation-engine team and the principal architect.

Qualifications

• Post-trade and system knowledge in securities.
• Experience with T2S settlement instructions and confirmations.
• ISO 20022 settlement messaging and SWIFT connectivity.
• Solution architecture for regulated, high-availability systems.
• Event-driven architecture and domain-driven design.
• Integration with legacy financial-market platforms, modernised step by step.
• Backend development in Go and/or Java: production code, not just prototypes.
• REST APIs (OpenAPI), Kafka and message brokers.
• SQL and NoSQL data stores.
• Containers on Linux: Docker, Kubernetes or OpenShift.
• Git, CI/CD, Terraform and observability tooling.

Responsibilities

• Own the team’s technical architecture: designs, interface contracts, standards and roadmap.
• Contribute production code to the codebase, starting with critical components such as the CSD gateway.
• Review code: pull requests, coding standards, test coverage and security.
• Design the CSD gateway and its T2S integration: lock and release, instructions, queuing, cut-offs, confirmations and status.
• Design for failure: handle duplicate or delayed messages, retries, partial failures, corrections and auditable exceptions.
• Reuse and extend existing Euronext Securities systems rather than duplicating them.
• Shape the architecture for corporate actions, entitlements and reporting to custodians.
• Set and test non-functional requirements: resilience, performance, security, recoverability and observability.
• Build prototypes and lead build, buy and integration decisions.
• Work with the product manager to align priorities; you own the technical solution.
• Help the team build, test and run what it ships: environments, CI/CD, monitoring, runbooks and on-call during T2S hours.

Skills

Architecture

Go

Java

REST APIs

Kafka

SQL/NoSQL

Docker/Kubernetes/OpenShift

Terraform

OpenTelemetry

CI/CD

Education

Bachelor's degree in computer science or related field

Tools

Go

Java

OpenAPI

Kafka

ActiveMQ

SQL

NoSQL

Docker

Kubernetes

OpenShift

Terraform

OpenTelemetry

Git

Job description

About the role

Euronext is building digital-asset services on its existing securities-market infrastructure. We are looking for a Principal Software Engineer to design and build the CSD capabilities that connect the two.

You will lead the architecture of the CSD Integration, Asset Servicing & Reporting team. The team builds the gateway and services that connect digital-asset applications to Euronext Securities for securities lock and release, settlement status, corporate actions and reporting. We reuse existing CSD capabilities; we do not rebuild the CSD.

You are both architect and developer: you design the solution, write production code in the team’s codebase and review your colleagues’ code. This is not a product-owner or functional-analyst role.

About the mission

The team owns the CSD side of Euronext Digital Assets: the CSD gateway for lock and release, T2S instructions and confirmations, corporate actions, T2 and Pontes, and reporting to custodians.

You will take these services from the first issuance and settlement flows to a scalable asset-servicing platform. You will agree the CSD gateway interface with the tokenisation-engine team and work with the principal architect, who owns the end-to-end design across teams.

What you’ll do

• Own the team’s technical architecture: designs, interface contracts, standards and roadmap.
• Contribute production code to the codebase, starting with the most critical components such as the CSD gateway.
• Review code: pull requests, coding standards, test coverage and security of the codebase.
• Design the CSD gateway and its T2S integration: lock and release, instructions, queuing, cut-offs, confirmations and status.
• Design for failure, not only the normal flow: duplicate or delayed messages, retries, partial failures, corrections, reconciliation breaks and auditable exception handling.
• Reuse and extend existing Euronext Securities systems rather than duplicate them.
• Shape the architecture for corporate actions, entitlements and reporting to custodians.
• Set and test non-functional requirements: resilience, performance, security, recoverability and observability.
• Build prototypes and lead build, buy and integration decisions.
• Work with the product manager, who owns priorities and requirements; you own the technical solution.
• Help the team build, test and run what it ships: environments, CI/CD, monitoring, runbooks and support during T2S operating hours.

What you bring

Required: post-trade and system knowledge

• Strong knowledge of securities post-trade: settlement, custody, corporate actions and CSD operations.
• T2S experience: settlement instructions, lifecycle, cut-offs and status reporting.
• ISO 20022 settlement messaging and SWIFT connectivity.

Required: architecture and design

• Solution architecture for regulated, high-availability systems: security, resilience and auditability.
• Event-driven architecture and domain-driven design.
• Integration with legacy financial-market platforms, modernised step by step without disrupting live operations.

Required: technical implementation

• Backend development in Go and/or Java: production code, not only prototypes.
• REST APIs (OpenAPI), Kafka and message brokers such as ActiveMQ.
• SQL and NoSQL data stores.
• Containers on Linux: Docker, Kubernetes or OpenShift.
• Git, CI/CD, test automation, infrastructure as code (e.g.Terraform) and observability (e.g.OpenTelemetry).
• AI-assisted development: daily use of coding assistants, with review guardrails for AI-generated code.

Required: experience and leadership

• 8+ years of software engineering on production systems, including 3+ years as lead engineer, software architect or solution architect, while still writing and reviewing code.
• Technical leadership: set standards, explain trade-offs to technical and non-technical audiences, coach engineers.
• Degree in computer science, engineering or a related field, or equivalent experience.
• Fluent in English.

Nice to have

• T2 and Pontes.
• Cross-CSD links.
• Corporate-actions platforms.
• Public cloud (AWS).
• DLT and blockchain: a plus, not a requirement.

Join Euronext – Shape capital markets for future generations

Join a company where market infrastructure is built on innovation — and where every innovation starts with a bold mind asking, “What’s next?”. At Euronext, we believe change is a starting point, not an obstacle. We look for people who see growth opportunities, think long term, and want to help shape capital markets for future generations.

Working with us means:

• Being part of an international, diverse and innovative team.
• Developing your skills through continuous learning and real responsibilities.
• Contributing to projects that matter in a dynamic environment.
• Playing an active role in building transparent, responsible and sustainable capital markets.

The CEDS Digital Asset team is dedicated to advancing secure and resilient securities issuance and settlement. We deliver cutting-edge solutions for both domestic and international markets, supporting clients throughout the entire value chain. Join us and play a key role in building the next generation of digital asset infrastructure.

Euronext is the leading European capital market covering the entire capital markets value chain, from listing, trading, clearing, settlement and custody, to solutions for issuers and investors. We operate seven national stock exchanges, handling 25% of European lit equity trading. Our products include equities, FX, ETFs, bonds, derivatives, commodities and indices. Euronext also provides clearing and settlement services through Euronext Clearing and our network of Euronext Securities CSDs. In addition, Euronext runs MTS, one of Europe’s leading electronic fixed income trading markets, and Nord Pool, the European power market. The company has a diverse domestic and international client base.

Find out more about us at: Euronext.com

Euronext Values

Unity

We respect and value the people we work with

We are unified through a common purpose

We embrace diversity and strive for inclusion

Integrity

We value transparency, communicate honestly and share information openly

We act with integrity in everything we do

We don’t hide our mistakes, and we learn from them

Agility

We act with a sense of urgency and decisiveness

We are adaptable, responsive and embrace change

We take smart risks

Energy

We are positively driven to make a difference and challenge the status quo

We focus on and encourage personal leadership

We motivate each other with our ambition

Accountability

We deliver maximum value to our customers and stakeholders

We take ownership and are accountable for the outcome

We reward and celebrate performance

We are proud to be an equal opportunity employer. We do not discriminate against individuals on the basis of race, gender, age, citizenship, religion, sexual orientation, gender identity or expression, disability, or any other legally protected factor. We value the unique talents of all our people, who come from diverse backgrounds with different personal experiences and points of view and we are committed to providing an environment of mutual respect.

Additional Information

This job description is only describing the main activities within a certain role and is not exhaustive. It does not prevent to add more tasks, projects.