Principal Software Engineer Europe

Startup Talents; France; On-site; EUR 120,000 - 200,000; Full time

Benefits offered by this job

Healthcare and life insurance

Retirement plan

Sponsored transportation

Gym membership

Lunch card

Home office equipment

Events and conferences funding

Job summary

A leading crypto security firm is seeking a Principal Solutions Engineer to define architecture and lead mission-critical projects. The role involves substantial mentoring, driving improvements, and aligning technical execution with company strategy. Candidates should have over 10 years of experience in backend software engineering, particularly in fintech or blockchain, with a strong grasp of TypeScript and systems languages. This position offers flexible remote work and a competitive salary of €120-200K, along with stock options and various benefits.

Qualifications

• 10+ years of backend software engineering experience, particularly in fintech or blockchain.
• Mastery of TypeScript and experience with one or more systems languages like Rust or Go.
• Proven experience in building scalable APIs and infrastructure.

Responsibilities

• Define and evolve architecture for databases, microservices, and integrations.
• Own mission-critical projects from requirements to production and iteration.
• Troubleshoot and resolve complex performance and reliability issues.

Skills

Backend software engineering

TypeScript

Rust

Go

C++

APIs development

Databases

Cloud (AWS)

Microservices

Problem-solving

Job description

A Crypto wallet security infrastructureprovider are looking for a Principal Solutions Engineer (Permanent role - Remote).

They develop the most secure wallet-as-a-service infrastructure in Web3: an API-first wallet management system, ideal for applications and organizations seeking to provide secure access to all blockchains through a single integration). APIs and SDKs were designed for wallet programmability and efficient implementations, enabling fast deployments, smart automation flows, as well as granular sets of permissions and policies via secure authentication credentials. They are on the way to become the leading wallet infrastructure for the multi-trillion-dollar digital asset industry.

The company is SOC-2 certified, employs 30 people across 6 countries and has raised over $20M since creation with prestigious investors. Their solution is used and trusted by major international corporations.

As a Principal Software Engineer, you will own critical projects while setting technical direction and ensuring the company's platform is fast, resilient, and secure. This is more than a coding role. You’ll make key architectural decisions, drive engineering standards, and mentor senior engineers. You’ll work with product, security, and leadership to align technical execution with company strategy and ensure our systems perform under the high-stakes demands of financial workflows

MISSIONS

• Define and evolve architecture for databases, microservices, and integrations.
• Own mission-critical projects end to end, from requirements to production and iteration.
• Troubleshoot and resolve complex performance and reliability challenges at scale.
• Drive improvements to CI/CD, observability, and engineering processes across teams.
• Collaborate with leadership to shape roadmap priorities and long-term technical vision.
• Mentor engineers, promote best practices, and represent the company in client discussions.

Requirements

• 10+ years of backend software engineering, with leadership in fintech or blockchain.
• Mastery of TypeScript plus one or more systems languages (Rust, Go, C++).
• Proven track record building scalable APIs, infrastructure, and developer platforms.
• Deep expertise with databases (PostgreSQL, DynamoDB, NoSQL) and cloud (AWS).
• Strong knowledge of microservices, CI/CD pipelines, observability, and SSDLC.
• Familiar with applied cryptography, PKI, and secure backend architectures.
• Exceptional problem-solving, communication, and ability to influence technical direction.
• Knowledge of the crypto custody industry and its use cases is a big plus.
• Fluency in multiple languages is also a plus.
• Contract : Permanent role (Hybrid remote) in Paris (France) or other EU countries
• Remote first company : flexibility to work fully remotely or at an office location of your preference within the European Union.
• Salary: €120-200K per year on a full-time permanent work contract.
• Equity: 150-300 stock options vested over 4 years with a one-year cliff.
• Work essentials: MacBook Pro, iPhone, AirPods, screens, headsets, AirPods, and cables are provided on Day 1 .
• Training and coursework in Crypto, Blockchain, Security, code, Coding languages and other topics are paid for on-demand to encourage personal and professional growth.
• Events: fully funded attendance at fintech, blockchain, or related conferences.
• Teams retreats/meetups/seminars/conferences all around the world to get to meet in-person and foster meaningful connections.
• Benefits: healthcare and life insurance, retirement plan, sponsored transportation, gym, lunch card, home office equipment, and other perks.

Recruitment process

• Video call with Vice CEO/CTO (30mn).
• Cognitive and personality tests (async).
• Take home coding test (in a language of your choice)
• Code focus interview with tech and security teams (Code review, Architecture review, security)