Software Engineer - Security Features

United States Digital Space LLC; Paris; Hybride; EUR 80 000 - 110 000; Plein temps

Résumé du poste

United States Digital Space LLC is seeking a Backend Software Engineer with a strong security background to join our Paris-based product development team. You will design, build, and operate backend services powering security-sensitive features for B2B and B2C users.

Based in Paris with a hybrid work model, you will collaborate with Product, Design, Infrastructure, and Security to strengthen identity controls, reduce risk, and improve overall security posture.

Qualifications

• Backend engineer with production SaaS experience.
• Strong security focus and threat modeling knowledge.
• Experience designing secure APIs and authentication flows.
• Experience working with security stakeholders (CISO).

Responsabilités

• Research, design, implement, and maintain backend services for user-protection features.
• Build identity, authentication, access control, and threat prevention features.
• Collaborate with Product and Security teams on requirements.
• Contribute to threat modeling and secure SDLC practices.
• Write high-quality, tested code with observability and ownership.
• Collaborate with cross-functional stakeholders to deliver secure features.

Connaissances

Backend development

Node.js

TypeScript

Application security

API design

Security concepts

English proficiency

Outils

AWS

GitLab

Terraform

SonarQube

ELK

Datadog

RDS

Redis

S3

Description du poste

About the company

the company’s mission is to deliver the credential security every business and employee needs to thrive. Millions of consumers, and over 25,000 brands worldwide, such as Michelin, Air France, and Forrester, trust the company for industry-leading innovations, patented zero-knowledge security, and an unmatched user experience. Founded in Paris, the company has since established offices in New York and Lisbon, and has grown to more than 300 Dashlaners globally.

We're looking for people who actively use AI tools to drive efficiency, creativity, and impact in their work. At the company, we drive innovation and value learning, strive for excellence in everything we do, and thrive as one team. Learn more aboutlife at the company, including how we work, how we hire, and the benefits of being a Dashlaner.

About the role

We are looking for a Backend Software Engineer with a strong security background to join our product development team based in Paris, which focuses on building innovative features to enrich the security protection for both our B2B and B2C users.

The goal of the team is to research and build product capabilities that improve user protection, strengthen identity and access controls, reduce security risks, and raise the overall security posture of the the company experience. In this role, you will design, build, and operate backend services that power security-sensitive features, working in close partnership with product, design, infrastructure, and the Security organization.

This role is a strong fit for an engineer who has already built security-relevant product features in a SaaS environment, understands application security fundamentals, and can contribute pragmatically to secure, scalable backend systems.

Location: You will be based in Paris, with English as your working language. At the company, we embrace a hybrid culture that combines the best of both worlds: the creativity and energy of in-person collaboration with the flexibility of remote work. Our model is designed to strengthen team connections while supporting individual productivity and work-life balance. To maximize collaboration, we come together in the office on Mondays, Tuesdays, and Thursdays, while Wednesdays and Fridays offer more flexibility for focused work.

At the company you will:

• Research, design, implement, and maintain backend services that support user-protection features across B2B and B2C products.


• Build features related to identity, authentication, access control, threat prevention, and other security-sensitive user journeys.


• Work closely with the Product team and the Security team to assess new opportunities, translate security requirements and risk assessments into effective product features.


• Contribute to threat modeling activities and apply security best practices throughout the software development lifecycle.


• Help improve the resilience of systems against common attack patterns such as account abuse, privilege misuse, insecure integrations, and identity-related vulnerabilities.


• Participate in architecture discussions and make pragmatic trade-off decisions that balance security, usability, maintainability, and delivery speed.


• Write high-quality, well-tested, maintainable code and support services in production with appropriate observability and operational ownership.


• Collaborate with cross-functional stakeholders to deliver security features that are technically sound and valuable to customers.

Our stack:

• Backend: Node.js, TypeScript


• Infrastructure: AWS, ECS, RDS, Redis, S3


• Tooling: GitLab, Terraform, SonarQube


• Observability: ELK, Datadog

Requirements

• Professional experience as a backend software engineer, with hands-on delivery of production systems in a SaaS or similarly cloud-based environment.


• Strong curiosity about security-related topics


• Strong experience building features that protect users and improve product security.


• Solid understanding of application security best practices, including secure design principles and threat modeling.


• Experience working closely with a CISO, Security team, or equivalent security stakeholders.


• Proficiency in backend development with modern languages and frameworks, ideally Node.js and TypeScript.


• Experience designing APIs, integrating external systems, and operating services in production.


• Good communication skills and the ability to work effectively in a cross-functional environment, particularly with Web/Client engineers, Product Managers, and Product designers.


• Fluency in English.

We\'re also looking for

• Strong knowledge in cryptography


• Familiarity with Identity and Access Management frameworks and protocols, such as Passkeys, SAML, OAuth, SCIM, or similar experience in working with other security-related features


• Experience building enterprise security features for administrators and managed business environments.


• Experience with authentication hardening, account recovery flows, access governance, or fraud and abuse prevention.


• Familiarity with modern passwordless authentication patterns and user identity lifecycle management.


• Experience contributing to security reviews, incident follow-ups, or remediation plans.


• Exposure to consumer-scale and business-scale product constraints in the same environment.

What success looks like

• You deliver backend capabilities that measurably improve user protection and security outcomes.


• You contribute to a strong engineering partnership with the Security organization from early design through production rollout.


• You help the new team establish high standards for secure development, system ownership, and practical execution.


• You make complex security topics understandable to non-specialists and help turn them into product value.

Diversity, Equity, Inclusion and Belonging at the company

As a truly international company—founded in France and distributed across France, US and Portugal—the company thrives off diverse perspectives. We value all aspects of diversity: gender identity, sexual orientation, ability, ethnic origin, social background, age, lifestyle, and more. We are committed to hiring a diverse community and fostering a culture where everyone is heard and belongs. See more about this here.

Your interview experience

To know what to expect once you’ve sent your application, read about how we interview and hire at the company. Feel free to browse our blog to find more information about our product and how we work.