Senior Backend Software Engineer, Ledger

Ledger

Location:
France, Paris

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

Building Ledger Enterprise Platform, a SaaS solution addressing the need to safeguard large amounts of cryptocurrencies while mitigating IT and physical assault threats. The Wallet domain is responsible for orchestrating interactions with various blockchain-specific components and external APIs, composed of an HTTP API (FastAPI) and a resilient workflow orchestration system (Temporal).

Job Responsibility:

Design and develop governance and orchestration layer
Develop a set of complex APIs
Communicate with cryptographic modules (HSM) and blockchain interfaces
Integrate new cryptocurrencies on Vault
Work closely with Product team to define and understand end-user requirements
Translate requirements into pragmatic technical solutions
Work in cross-team environment with Frontend and QA engineers
Interface with cross-functional teams such as Core, Firmware, Infrastructure, and Operations
Participate in firefighting sessions
Interface with stakeholders like Technical Account Managers

Requirements:

5+ years of experience in Backend/Software Engineering role
3+ years of experience in Python as primary language (FastAPI)
Capable of self-training on backend languages like Scala/NodeJS
Familiarity with software development best practices - version-control, code-reviews, testing, CI/CD
Work in an agile environment (Scrum/XP/Kanban)
Work in a multicultural environment - English is a MUST
Sound knowledge of RESTful API design, standards and best practices

Nice to have:

Interest in other API frameworks (e.g. GraphQL)
Dabble in message based systems
Keen to step outside area of expertise and contribute to all parts of a product
Interest in cryptocurrencies and blockchain technology
Active in the open-source community, speak at conferences, attend meetups, write blogs, contribute code

What we offer:

Flexible work options - work from home up to 3 times per week
Health & Wellness support - Health and Life Insurance
Financial growth opportunities - employees can become shareholders
Commuter allowance
Learning & Development - comprehensive suite of training solutions

Additional Information:

Job Posted:
September 19, 2025

Employment Type:

Fulltime

Work Type:

Hybrid work

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Senior Backend Software Engineer