Defi Rust Developer Job at Harrington Starr (London)

Developer Relations Engineer

Chainway Labs is seeking a DevRel Engineer to join our team at Citrea, Bitcoin’s...

Location

Salary:

Not provided

Chainway Labs

Expiration Date

Until further notice

Requirements

Deep understanding of both Bitcoin and EVM ecosystems (e.g. BTC script, L1 security models, Solidity, rollups, etc.)
Strong technical writer who can explain complex concepts clearly and simply
Have built web3 applications and understand developer tools and workflows
Strong empathy for developers
you’ve shipped code yourself and know what good DX feels like
Curious and passionate about ZkEVM, rollups, and Bitcoin
A user and a researcher of DeFi protocols on other chains
Enjoy engaging with the developer community on Social Media (X, Discord, Youtube)
Previous DevRel experience or community building in a web3 project
Experience contributing to or maintaining open-source projects

Job Responsibility

Own and continuously improve developer documentation, tutorials, quickstarts, and integration guides
Create high-quality content: sample dApps, blog posts, videos, FAQs, walkthroughs, code snippets
Engage with developers on X, Discord, GitHub, Telegram, YouTube and other channels
surface common pain points to the product management & engineering teams and provide hands-on support
Collaborate with internal engineering and product teams and external partners such as developer tooling providers to clarify features, flag confusing UX, and advocate for developer needs
Help design and maintain a best-in-class developer onboarding flow
Due diligence on inbound ecosystem projects and teams, evaluating their technical capabilities and feasibility
Engage with Citrea Origins, Citrea’s incubation program, by funneling top developers from the ecosystem into incubation and contributing to the success of existing teams
Track community sentiment, identify friction points, and champion feedback into the product
Speak at or support virtual events, hackathons, and community activations when relevant

What we offer

Competitive compensation package, including equity options
Remote work setting
Engaging community activities that foster team bonding and collaboration
A welcoming atmosphere where every team member's opinion is valued
A dynamic team environment filled with bright, young, and dedicated colleagues, offering an enriching collaborative experience

Fulltime

Principal Blockchain Engineer

As a Principal Blockchain Engineer on the DeFi Yield Gen Platform team, you’ll g...

Location

United States , Jersey City; Merrimack; Westlake

Salary:

107000.00 - 216000.00 USD / Year

Fidelity Investments

Expiration Date

Until further notice

Requirements

Bachelor's degree in computer science or related field required
8+ years' of progressive experience in software engineering using programming languages like RUST
Hands-on experience with L1 & L2 blockchains such as Ethereum, Polygon, Arbitrum
Hands-on experience building highly performant and low latency applications
Proficient in databases and SQL
An understanding of microservice architecture
Ability to build reliable software that can withstand unreliable environments
Experience building unit and integration tests
Experience building and deploying applications using continuous integration pipelines and automated deployment tools such as Jenkins Core
Possess critical thinking skills to build end-to-end solutions

Job Responsibility

Develop your skills and collaborate with engineers across Fidelity
Work closely with technical leaders and Architects to build a secure crypto yield generation platform utilizing modern software development practices
Mentor engineers on the best practices for Software development

What we offer

Comprehensive health care coverage and emotional well-being support
Market-leading retirement
Generous paid time off and parental leave
Charitable giving employee match program
Educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career

Fulltime

New

Principal Rust Engineer

As a Principal Software Engineer on the DeFi Yield Gen Platform team, you’ll get...

Location

United States , Jersey City; Merrimack; Westlake

Salary:

107000.00 - 216000.00 USD / Year

Fidelity Investments

Expiration Date

Until further notice

Requirements

Bachelor's degree in computer science or related field required
8+ years' of progressive experience in software engineering using programming languages like RUST and Python
Ability to build reliable software that can withstand unreliable environments
Experience building unit and integration tests
Experience building and deploying applications using continuous integration pipelines and automated deployment tools such as Jenkins Core
Possess critical thinking skills to build end-to-end solutions
Passionate and committed to learning new things and developing with the latest technologies and frameworks
Work well in both a small agile team and independently, having a strong user focus
Strong analytical and communication skills and the ability to handle multiple tasks at any given time
Participate in engineering practices such as code and design reviews, environment strategy, and build and deployment pipelines

Job Responsibility

Design and implement highly optimized, low-latency software for automated trading systems and analytical platforms
Enhance and maintain the DeFi trading platform, ensuring robustness and scalability
Collaborate with quantitative researchers and traders to deliver custom software solutions for developing strategies for trading Digital Assets
Provide ongoing support for trading systems and research platforms
Mentor engineers on the best practices for Software development

What we offer

Comprehensive health care coverage and emotional well-being support
Market-leading retirement
Generous paid time off and parental leave
Charitable giving employee match program
Educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career

Fulltime

Backend Developer

We are looking for an experienced Backend Engineer to help build and scale the c...

Location

Salary:

150000.00 - 180000.00 EUR / Year

G2i Inc.

Expiration Date

Until further notice

Requirements

5+ years of professional experience building backend systems with a strong focus on performance and reliability
Proficiency in Rust (or equivalent systems programming) for backend service development
Practical experience with messaging / streaming systems such as Redis Streams, Kafka, or similar
Deep understanding of databases under high concurrency and techniques to mitigate contention, scale reads/writes, and ensure consistency
Experience with event-driven architectures and building asynchronous, distributed systems
Comfortable building and scaling systems that handle 1,000+ executions/sec today with design foresight for 10×–100× future growth

Job Responsibility

Design, implement, and maintain backend services for high-performance trading systems and market infrastructure
Build messaging and streaming systems powering real-time data flows and order execution (e.g., Redis Streams, Kafka, or similar)
Develop robust event-driven systems to support concurrency at scale and consistent execution semantics under heavy load
Optimize database schemas and access patterns for extremely high concurrency and low-latency performance
Collaborate with cross-functional teams to ensure scalable and fault-tolerant backend architecture
Monitor, profile, and tune services to meet performance SLAs in production
Contribute to architectural discussions and drive improvements in system reliability, observability, and scalability

What we offer

Competitive compensation and full remote flexibility
Impactful work — contributions go directly into protocol and platform performance

Fulltime

Rust Engineer

Operating at the intersection of traditional financial systems and DeFi, this te...

Location

Salary:

135000.00 - 180000.00 USD / Year

Lawrence Harvey

Expiration Date

Until further notice

Requirements

Strong backend engineering experience with Rust in performance-sensitive systems
Solid understanding of distributed systems, concurrency, and systems-level architecture
Comfortable operating in environments with strict latency, reliability, and correctness requirements
Experience with trading systems, blockchain infrastructure, or DeFi protocols is a strong plus
High ownership mindset with the ability to operate effectively in lean, fast-moving teams

Job Responsibility

Design and build high-performance backend systems powering on-chain trading infrastructure
Develop low-latency matching engines, risk systems, and settlement pipelines in Rust
Own features end-to-end, from system design through to production deployment
Collaborate with smart contract, protocol, and tooling teams on blockchain integration
Drive architectural decisions around performance, scalability, and correctness

Fulltime

Blockchain Developer

Securitize, the leader in tokenizing real-world assets with $3.7B+ AUM (as of Ma...

Location

Argentina

Salary:

72000.00 - 78000.00 USD / Year

Silver.dev

Expiration Date

Until further notice

Requirements

5+ years of working in software development
Able to contribute to technical designs and architecture definitions
Proficiency in JavaScript + NodeJS + TypeScript
Proficiency in Rust and hands-on experience on Solana smart contracts/Anchor Framework
You know the blockchain space and have the curiosity to research and try by yourself all the latest developments in the industry
Enthusiastic about DeFi
Be a team player
Be able to interact with Product teams in order to translate requirements into technical designs

Job Responsibility

Develop new features using Node.js + NestJS / TypeScript
Design, write, test and deploy Solidity Smart Contracts in Ethereal / EVM networks
Contribute with your experience in CI/CD pipelines with unit testing and code coverage requirements
Knowledge about UI frameworks (like Vue or React)
Create clean and modern code, following all the industry best practices
Code with performance and security in mind
Work independently and proactively find opportunities for improvements in both code quality and team processes

What we offer

Unlimited Paid Time Off (PTO)
Equity Grant Opportunities
Remote Work Flexibility

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

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

Defi Rust Developer

Harrington Starr

Location:
United Kingdom , London

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
March 01, 2026

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