Staff Engineer

Jus Mundi SAS; Paris; Sur place; EUR 120 000 - 160 000; Plein temps

Avantages offerts par ce poste

Office in Paris

Résumé du poste

Jus Mundi is seeking a Staff Engineer to shape a resilient, secure, and scalable platform. You will act as a technical guardian for an engineering organization, balancing hands‑on work with跨-team orchestration to deliver impact.

The role balances strategic leadership with practical coding across PHP/Symfony, Python, and related stacks, driving platform upgrades and large-scale transitions in a fast-paced legal-tech environment.

Qualifications

• 10+ years of professional software engineering experience.
• ≥3 years in senior or staff-level technical leadership roles.
• Strong track record leading complex projects without direct people management.

Responsabilités

• Drive architectural decisions and product-focused technical strategy across teams.
• Design fault-tolerant, scalable distributed systems and guide migrations.
• Lead by example in code quality, testing, security by design, and deployments.

Connaissances

Senior software eng

Technical leadership

Software architecture

Cloud infrastructure

English fluent

Outils

PHP

Symfony

Python

Go

Nuxt/Vue

Description du poste

Founded in 2019 and recognized as a mission-led company, Jus Mundi is pioneering legal technology to power global justice through artificial intelligence.

Headquartered in Paris, with additional offices in New York, London, and Singapore, Jus Mundi serves over 150,000 users, including top law firms, multinational corporations, government bodies, and academic institutions in more than 90 countries. By combining legal expertise with cutting‑edge AI technology, we provide global legal intelligence, data‑driven arbitration professional selection, and business development services.

What Makes Jus Mundi the Place to Be

• Our Values : With core values as Listen (Solve for the Legal Community), Iterate (Start Sharp, Stop Smart), Commit (Step In, Own the Outcome), Belong (Build together through diversity), and Uphold (Aim for Justice with Integrity), we cultivate a dynamic environment that encourages collaboration, innovation, and continuous growth.
• Legal Is the Next Frontier for GenAI : Legal is one of the top industries ready to be transformed by GenAI. At Jus Mundi, we’re building transformative AI where it has the power to make the most impact.
• Proven Product Market Fit : Jus Mundi has secured product‑market fit in global markets since launch, partnering with top‑tier law firms, government bodies, and major corporations, including: Freshfields, Quinn Emanuel, Wong Partnership, Total Energies, Canada, UK, and Japan.
• Strategic Investment : We recently raised over $20 million in Series B funding from prominent strategic international investors, including Acton Capital, True Global Ventures, C4 Ventures, and FJ Labs, fueling our growth and innovation.
• Legal Meets Tech : Our engineers and former lawyers collaborate closely with large language models (LLMs) to pioneer the future of generative AI and reshape professional services.
• Exceptional Team : Work with talented professionals from industry leaders, including engineers, legal experts, and AI specialists from companies like Google and Amazon who are pushing the boundaries of legal tech.

About the Role

Jus Mundi is looking for a Staff Engineer to play a critical role in shaping and sustaining a resilient, secure, and scalable platform that acts as a force multiplier for our entire engineering organization.

Engineering Product Design team North Star is “ Zero-friction delivery : We deliver business value at speed and securely by mastering simple, standardized engineering practices.”. You will be the technical guardian of this mission, doing whatever it takes, from hands‑on implementation to cross‑team orchestration to make it happen, grounding every technical decision in product impact and a deep understanding of our business context (users, workflows, and value drivers).

This role balances strategic technical leadership with hands‑on engineering work. You'll roll up your sleeves for critical stack upgrades (PHP, Symfony, third party libraries, etc.) as much as you'll architect large‑scale system transitions.

This is a senior individual contributor role with broad influence, designed for an engineer who drives impact through architecture, standards, mentorship, and product‑oriented technical leadership rather than people management.

The Team

You will work across multiple product and platform teams within Jus Mundi's Engineering organization, collaborating closely with Engineering, Product, AI, and Security stakeholders from different squads to define shared foundations and enable teams to move faster and safer.

Our engineering culture values high ownership, pragmatism, collaboration, and technical excellence.

Strategic Leadership & Architecture

• Drive architectural decisions and technical strategy across multiple teams and domains, with a strong focus on product outcomes and user impact
• Design and evolve fault‑tolerant, scalable distributed systems
• Guide teams toward sound architectural decisions and coordinate initiatives across multiple squads
• Partner with Product and Engineering leaders to balance technical trade‑offs with business value

Hands‑On Technical Work

• Tackle essential work such as stack upgrades (PHP, Symfony) and technical migrations
• Write production code across different domains and rapidly context‑switch between technical subjects
• Jump into crisis situations and drive resolution (e.g., critical infrastructure incidents)
• Lead by example in code quality, testing strategies, security by design, and deployment best practices

Platform Excellence & Engineering Framework

• Lead the implementation of our new engineering framework (priority #1)
• Define and enforce engineering standards related to reliability, security, testing, and deployment
• Lead the transition toward fully automated, self‑healing, and immutable infrastructure
• Drive platform‑wide initiatives that improve developer productivity, system reliability, and end‑user experience

Preferred Experience and Skills

Experience & Seniority

• 10+ years of professional experience in software engineering and cloud infrastructure management
• At least 3 years in senior or staff‑level technical leadership roles
• Strong track record of leading complex technical projects without direct managerial authority

Technical Stack & DevOps

• Senior software engineer with strong PHP & Symfony experience (our core backend stack)
• Working knowledge of Python (used across our AI and data services)
• Nice to have: Go and Nuxt/Vue
• Deep expertise in system design and distributed systems architecture
• Proven ability to make and communicate clear technical trade‑offs
• Experience orchestrating complex technical transitions across multiple teams

Leadership & Communication

• Crisis management experience and composure under pressure
• Strong opinions with ability to advocate for positions while driving consensus
• Excellent capacity to convince, guide, and drive technical decisions
• Outstanding written and verbal communication skills in English (fluent required)
• Strong product mindset with ability to understand business context and user needs
• Ability to evolve in a fast changing environment, reevaluating priorities and choosing the right impact at the right time under multi lever requirements

Bonus: Experience in SaaS or AI‑powered platforms, security engineering, large‑scale platform engineering, or legal tech environments is a plus.

We’re proud of our multicultural team representing 37 nationalities! To ensure smooth communication, please apply in English ( CV + Application Form ).

• Introductory Video Callwith Laurine, Talent Manager (30 min)
• System Design Interview with Yohan, Head of Infrastructure, and Dash, Head of AI (1h30)
• Live Programming Exercice with John, Tech Lead Manager, and one Software Engineer (1h30-2h)
• Product & Technical Mindset interview with Matthieu, Tech Lead Manager, and one Product Manager (45 min)
• Half-Day of immersion at the Office + Lunch or Afterwork (3h)
• Last call with Jean‑Rémi, CEO, or Anna, VP of People (30 min)

Please note that, due to the nature of