Backend Engineer (Scala) Job at Randstad (Tokyo)

Scala Backend Engineer

At Ledger, we’re proud to be the global platform for digital assets and Web3. Jo...

Location

France , Paris

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

First relevant experience in backend robust development
Good proficiency in Scala or similar functional programming language
Good proficiency in English
Node.js and Java developers who are willing to dive into Scala technologies are welcome
Enthusiastic about teamwork, learning, and teaching (meet-ups, hackathons, training…)
Adaptability to do teamwork in a fast-evolving environment
You are autonomous, proactive, and capable of self-training
Having an interest in cryptocurrencies and wishing to work with blockchain technology is a real plus

Job Responsibility

Build highly available, consistent, and performant services to power Ledger’s products
Integrate and consolidate off-chain data coming from several API sources
Leverage all the power of functional programming with Scala and the Typelevel stack
Maintain tools and services in a diverse stack (Scala, Python)
Conduct benchmarks to identify bottlenecks and optimize the overall performance of our services
Deliver a high-quality piece of software (Test it, Document it, Demonstrate it)
Design monitoring systems to detect unexpected failures/behavior
Use CI / CD to deploy and secure workflows

What we offer

Flexible work options - Our hybrid policy allows employees to work from home up to 3 times per week
Health & Wellness support - Health and Life Insurance
Financial growth opportunities - Employees can become shareholders in Ledger as well as other financial benefits depending on your country of work
Commuter allowance
Learning & Development - A comprehensive suite of training solutions providing a personalised learning experience

Fulltime

Scala Backend Engineer

Join the backend services team at Ledger to build services that power Ledger pro...

Location

France , Paris

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

First relevant experience in backend robust development
Good proficiency in Scala or similar functional programming language
Good proficiency in English
Enthusiastic about teamwork, learning, and teaching
Adaptability to do teamwork in a fast-evolving environment
Autonomous, proactive, and capable of self-training

Job Responsibility

Build highly available, consistent, and performant services to power Ledger's products
Integrate and consolidate off-chain data coming from several API sources
Leverage all the power of functional programming with Scala and the Typelevel stack
Maintain tools and services in a diverse stack (Scala, Python)
Conduct benchmarks to identify bottlenecks and optimize the overall performance of our services
Deliver a high-quality piece of software (Test it, Document it, Demonstrate it)
Design monitoring systems to detect unexpected failures/behavior
Use CI / CD to deploy and secure workflows

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

Fulltime

Senior Scala Backend Engineer

To sustain the company's growth, Ledger is looking for new talents. You will sta...

Location

France , Paris

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Experienced engineer and continuous learner with 6+ years of relevant engineering experience
2+ years of technical leadership experience, including effective communication of complex concepts and cross-team coordination to ship critical products
Advanced Scala proficiency
expert-level proficiency, and advanced mastery of a second backend language (e.g., Rust, Java, Python, PHP) is a plus
Excellent collaboration and communication skills
Experience collaborating closely with QA, product management, and key stakeholders to develop and deliver on a shared vision
Led development of complex, high-performance interactive browser applications, including architecture, infrastructure, and optimization
Experience with various web architecture patterns (e.g., Microservices, Event-Driven, P2P)
Ability to apply and adapt software engineering best practices to the engineering environment
Experience in the Web3 ecosystem and in a project involving blockchain fundamentals

Job Responsibility

Develop and maintain high-performance, resilient microservices and APIs to power Ledger's products, including integrations with staking, yield, DeFi services, and blockchain explorers
Contribute to the architecture, design, and implementation of scalable solutions, proactively identifying and addressing technical challenges
Ensure software quality through testing, documentation, and performance optimization, including monitoring and alerting systems
Enhance and maintain CI/CD pipelines to secure and streamline deployment workflows
Provide technical leadership and mentorship, collaborating across teams to deliver impactful projects and improve engineering standards
Drive innovation by identifying opportunities for improvement, contributing to a shared knowledge base, and participating in technical outreach
Manage projects effectively, respecting deadlines, priorities, and deliverables

What we offer

Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow
Flexibility: A hybrid work policy
Social: Annual company outing for Ledgerdary Days, plus frequent social events, snacks and drinks
Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage
Well-being: Personal development, coaching & fitness with our dedicated partners
Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
High tech: Access to high performance office equipment and gadgets
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products

Fulltime

Scala Backend Software Engineer, Senior / Lead

To sustain the company's growth, Ledger is looking for new talents. You will sta...

Location

France , Paris

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Experienced engineer and continuous learner with 6+ years of relevant engineering experience
2+ years of technical leadership experience, including effective communication of complex concepts and cross-team coordination to ship critical products
Advanced Scala proficiency
expert-level proficiency, and advanced mastery of a second backend language (e.g., Rust, Java, Python, PHP) is a plus
Excellent collaboration and communication skills
Experience collaborating closely with QA, product management, and key stakeholders to develop and deliver on a shared vision
Led development of complex, high-performance interactive browser applications, including architecture, infrastructure, and optimization
Experience with various web architecture patterns (e.g., Microservices, Event-Driven, P2P)
Ability to apply and adapt software engineering best practices to the engineering environment
Experience in the Web3 ecosystem and in a project involving blockchain fundamentals

Job Responsibility

Develop and maintain high-performance, resilient microservices and APIs to power Ledger's products, including integrations with staking, yield, DeFi services, and blockchain explorers
Contribute to the architecture, design, and implementation of scalable solutions, proactively identifying and addressing technical challenges
Ensure software quality through testing, documentation, and performance optimization, including monitoring and alerting systems
Enhance and maintain CI/CD pipelines to secure and streamline deployment workflows
Provide technical leadership and mentorship, collaborating across teams to deliver impactful projects and improve engineering standards
Drive innovation by identifying opportunities for improvement, contributing to a shared knowledge base, and participating in technical outreach
Manage projects effectively, respecting deadlines, priorities, and deliverables.

What we offer

Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow
Flexibility: A hybrid work policy
Social: Annual company outing for Ledgerdary Days, plus frequent social events, snacks and drinks
Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage
Well-being: Personal development, coaching & fitness with our dedicated partners
Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
High tech: Access to high performance office equipment and gadgets
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products.

Fulltime

Staff Software Engineer - Backend

You will join the Cloud Wallet team which is in charge of building and maintaini...

Location

France , Grenoble

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Demonstrable experience and knowledge of backend services programming
An interest in working in a polyglot environment (Scala experience is not mandatory, but a real plus)
Knowledge of relational databases and SQL (we use Postgres)
Knowledge of Linux operating systems
Adaptability to work within a team in an evolving environment: You are autonomous, proactive, and able to upskill in certain areas yourself where necessary
Experience with continuous integration/deployment solutions
Knowledge of containerization and cloud deployments
An interest in cryptocurrencies and wishing to work with blockchain technology is a real plus
Enthusiastic about teamwork, learning, and teaching (meet-ups, hackathons, training…)

Job Responsibility

Build highly available, consistent, and well-functioning services to power Ledger's products
Leverage all the power of functional programming with Scala and the Typelevel stack
Dive into cryptocurrencies protocols internals
Conduct benchmarks to identify bottlenecks and optimize the overall performance of our services
Deliver a high-quality piece of software (Test it, Document it, Demonstrate it)
Design monitoring and alerting systems to detect unexpected failures/behavior
Use CI/CD to deploy and secure workflows

What we offer

Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow
Flexibility: A hybrid work policy
Social: Frequent social events, snacks and drinks
Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage
Well-being: Personal development, coaching & fitness with our dedicated partners
Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
High tech: Access to high performance office equipment and gadgets, including Apple products
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products

Fulltime

Staff Software Engineer - Backend

You will join the Cloud Wallet team which is responsible for building and mainta...

Location

France , Montpellier

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Demonstrable experience and knowledge of backend services programming
an interest in working in a polyglot environment (Scala experience is not mandatory, but a real plus)
knowledge of relational databases and SQL (we use Postgres)
knowledge of Linux operating systems
adaptability to work within a team in an evolving environment: you are autonomous, proactive, and able to upskill in certain areas yourself where necessary
experience with continuous integration/deployment solutions
knowledge of containerization and cloud deployments
an interest in cryptocurrencies and wishing to work with blockchain technology is a real plus
enthusiastic about teamwork, learning, and teaching (meet-ups, hackathons, training…).

Job Responsibility

Build highly available, consistent, and well-functioning services to power Ledger's products
leverage all the power of functional programming with Scala and the Typelevel stack
dive into cryptocurrencies protocols internals
conduct benchmarks to identify bottlenecks and optimize the overall performance of our services
deliver a high-quality piece of software (test it, document it, demonstrate it)
design monitoring and alerting systems to detect unexpected failures/behavior
use CI/CD to deploy and secure workflows.

What we offer

Equity: employees are the foundation of our success, and we award stock options
flexibility: a hybrid work policy
social: frequent social events, snacks and drinks
medical: comprehensive health insurance policy offering extensive medical, dental and vision care coverage
well-being: personal development, coaching & fitness with our dedicated partners
vacation: five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
high tech: access to high performance office equipment and gadgets, including Apple products
transport: Ledger reimburses part of your preferred means of transportation
discounts: employee discount on all our products.

Fulltime

Staff Software Engineer - Backend

You will join the Cloud Wallet team which is in charge of building and maintaini...

Location

France , Montpellier

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Demonstrable experience and knowledge of backend services programming
An interest in working in a polyglot environment (Scala experience is not mandatory, but a real plus)
Knowledge of relational databases and SQL (we use Postgres)
Knowledge of Linux operating systems
Adaptability to work within a team in an evolving environment: You are autonomous, proactive, and able to upskill in certain areas yourself where necessary
Experience with continuous integration/deployment solutions
Knowledge of containerization and cloud deployments
An interest in cryptocurrencies and wishing to work with blockchain technology is a real plus
Enthusiastic about teamwork, learning, and teaching (meet-ups, hackathons, training...)

Job Responsibility

Build highly available, consistent, and well-functioning services to power Ledger's products
Leverage all the power of functional programming with Scala and the Typelevel stack
Dive into cryptocurrencies protocols internals
Conduct benchmarks to identify bottlenecks and optimize the overall performance of our services
Deliver a high-quality piece of software (Test it, Document it, Demonstrate it)
Design monitoring and alerting systems to detect unexpected failures/behavior
Use CI/CD to deploy and secure workflows

What we offer

Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow
Flexibility: A hybrid work policy
Social: Frequent social events, snacks and drinks
Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage
Well-being: Personal development, coaching & fitness with our dedicated partners
Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
High tech: Access to high performance office equipment and gadgets, including Apple products
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products

Fulltime

Staff Software Engineer - Backend

You will join the Cloud Wallet team which is in charge of building and maintaini...

Location

France , Paris

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Demonstrable experience and knowledge of backend services programming
An interest in working in a polyglot environment (Scala experience is not mandatory, but a real plus)
Knowledge of relational databases and SQL (we use Postgres)
Knowledge of Linux operating systems
Adaptability to work within a team in an evolving environment: You are autonomous, proactive, and able to upskill in certain areas yourself where necessary
Experience with continuous integration/deployment solutions
Knowledge of containerization and cloud deployments
An interest in cryptocurrencies and wishing to work with blockchain technology is a real plus
Enthusiastic about teamwork, learning, and teaching (meet-ups, hackathons, training…)

Job Responsibility

Build highly available, consistent, and well-functioning services to power Ledger's products
Leverage all the power of functional programming with Scala and the Typelevel stack
Dive into cryptocurrencies protocols internals
Conduct benchmarks to identify bottlenecks and optimize the overall performance of our services
Deliver a high-quality piece of software (Test it, Document it, Demonstrate it)
Design monitoring and alerting systems to detect unexpected failures/behavior
Use CI/CD to deploy and secure workflows

What we offer

Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow
Flexibility: A hybrid work policy
Social: Frequent social events, snacks and drinks
Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage
Well-being: Personal development, coaching & fitness with our dedicated partners
Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
High tech: Access to high performance office equipment and gadgets, including Apple products
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products

Fulltime

Backend Engineer (Scala)

Randstad

Location:
Japan , Tokyo

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
May 09, 2025

Expiration:
February 02, 2026

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Requirements:

Nice to have:

Additional Information:

Job Posted:May 09, 2025

Expiration:February 02, 2026

Looking for more opportunities? Search for other job offers that match your skills and interests.

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Location:
Japan , Tokyo

Category:
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Contract Type:
Not provided

Job Posted:
May 09, 2025

Expiration:
February 02, 2026