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

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

Senior Blockchain Engineer

We are seeking an experienced Senior Blockchain Engineer to architect and implem...

Location

United States , San Francisco

Salary:

175000.00 - 185000.00 USD / Year

Signify Technology

Expiration Date

Until further notice

Requirements

Bachelor’s or Master’s degree in Computer Science, Cryptography, or related technical field
Public technical footprint — GitHub contributions, open-source code, technical articles, or recorded talks that demonstrate hands-on expertise
5+ years of blockchain development experience (protocol, dApps, Layer 1/Layer 2, or DeFi/Web3)
Proficiency in Golang, Rust, and Solidity
Strong understanding of smart contract security, cryptography, and distributed systems
Experience with Ethereum, Solana, or other major blockchain platforms
Proven track record of delivering production-grade blockchain systems

Job Responsibility

Design, build, and maintain blockchain protocols, smart contracts, and distributed systems powering the firm’s ecosystem
Develop tokenized payment systems and identity verification flows, ensuring high security and usability
Implement smart contracts for token utility, payments, and governance
Ensure security, scalability, and efficiency of blockchain systems through rigorous testing and best practices
Integrate biometric verification (Face Scan) and payment flows (BioPay) into blockchain applications
Collaborate with Product, Engineering, and QA teams to align blockchain development with roadmap and user needs
Mentor junior engineers and contribute to best practices for blockchain development
Stay ahead of emerging trends in real-world asset (RWA) tokenization, DeFi, and decentralized identity to guide innovation

What we offer

Competitive salary and equity opportunities
401(k)
Vision, Dental, and Medical Insurance
Paid Time Off (PTO)

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

Senior Backend Developer

Echelon Labs is a developer group that contributes to the Echelon protocol. with...

Location

Salary:

120000.00 - 200000.00 USD / Year

Aptos

Expiration Date

Until further notice

Requirements

Proven experience in developing smart contracts with high TVL for production environments, or track record in building backend systems in top tech companies
Strong organizational skills, attention to detail, ability to work in a fast-paced team environment and a focus on code quality and best practices
Experience with a low-level programming languages such as Rust, Go, Java, or C/C++
Familiarity of smart contract languages such as Move and Solidity
Code security and auditing experience

Job Responsibility

Help architect MVPs that will become essential to Echelon’s DeFi product suite such as margin accounts and trading, options vaults, and liquidity products
Build out new contracts and supporting infrastructure using Move, develop and test and iterate these smart contracts and systems
Deploy and monitor applications on testnet and mainnet
Work with frontend developers to streamline dApp integration and functionality
Evaluate Move-language docs, smart contract libraries, and other tools and help make decisions as to which should be included in our stack

Fulltime

Quantitative Analyst Intern

Quantitative Analyst Intern - Crypto. We are looking for a high-caliber Quantita...

Location

United Kingdom; Belgium , London; Brussels

Salary:

Not provided

Keyrock

Expiration Date

Until further notice

Requirements

Recent or upcoming graduate from a top university in financial engineering, mathematics, physics, computer science, or a related quantitative field
Solid foundation in Python (specifically for data science) and SQL
Exposure to Rust or a strong desire to learn it is highly valued
Strong academic background in a quantitative field (Math, Physics, CS, or Financial Engineering)
Comfortable with probability, statistics, and linear algebra applied to real-world trading
Track record of running automated or semi-automated strategies—be it funding arbitrage, cash & carry, or delta-neutral market-making
Working knowledge of traditional equity market structure
Understanding of Perpetual DEX dynamics and on-chain mechanics
Thrive in fast-paced environments, can manage multiple workstreams, and have the 'owner mindset' to see projects through to completion
Fluency in English is a must

Job Responsibility

Assist in the development of modular Python-based libraries (utilizing Pandas, NumPy, and Polars) to standardize performance metrics and unify global trading data
Perform deep-dive statistical analysis on trade-level data to decompose PnL drivers, isolate alpha decay, and identify execution drag or 'toxic flow'
Analyze the incentive structures and market-making programs of leading protocols (e.g., Hyperliquid/HIP-3, Paradex, Lighter)
Help optimize our participation to maximize protocol rewards and capital efficiency
Build and maintain automated workflows that convert raw L1/L2 order book data into actionable insights for the Trading and Investment Committees
Proactively track market microstructure signals and portfolio exposures to highlight emerging risks and identify underutilized liquidity opportunities

What we offer

A 6 month paid internship
Company and team wide offsites
A global, collaborative and tech-driven environment
Autonomy & Impact - our flat structure means you can contribute your ideas from day one and help shape the foundation that will power Keyrock’s future business
Culture of Excellence - we value nimbleness, drive for success, owner mentality and collaboration

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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