Blockchain.com

Company Name: Blockchain.com
Job Title: Senior Front-End Engineer (Web3)
Job Description: Blockchain.com is the world's leading software platform for digital assets. Offering the largest production blockchain platform in the world, we share the passion to code, create, and ultimately build an open, accessible and fair financial future, one piece of software at a time.
We are seeking a proactive and skilled Senior Front-End Engineer to join our lean, high-impact team and help shape the future of Web3. You’ll dive deep into building innovative financial and crypto-native products, services, and APIs, playing a pivotal role in delivering cutting-edge onchain solutions. As a key member of our Web3-focused crew, you’ll bring your expertise to craft seamless, user-centric experiences that push the boundaries of decentralized technology.
In this role, you’ll lead by example—guiding technical discussions, shaping our front-end architecture, and championing best-in-class engineering practices. With a hands-on mindset and a passion for efficiency, you’ll collaborate closely with our talented team, driving creative solutions without the drag of unnecessary bureaucracy. If you thrive at the intersection of focus, creativity, and technical excellence, this is your chance to make a lasting mark on the frontier of Web3.

WHAT YOU WILL DO
Design and build cutting-edge Web3 applications, prioritizing intuitive UX and top-tier performance to deliver seamless, impactful user experiences.
Collaborate proactively with our lean team, sharing knowledge and insights to elevate our collective expertise and accelerate innovation.
Tackle the most compelling and complex challenges in the Web3 space, pushing the limits of decentralized technology with creative, hands-on solutions.
Thrive in a fast-paced environment, leveraging the latest tools, frameworks, and advancements to get the job done.

WHAT YOU WILL NEED
Web3 Expertise: Proven experience with blockchain technologies, cryptocurrencies, and Web3 development, including proficiency in client-side signing and crypto transaction handling (e.g., Bitcoin, Ethereum).
Technical Skills: Strong command of React, Web3 libraries (e.g., web3.js, ethers.js) and wallet integrations, paired with a track record of delivering secure, functional front-end solutions.
Ownership & Independence: Ability to take full responsibility for your work—scoping, implementing, testing, and releasing high-quality features independently, without leaning on product managers, QA, or other developers.
Problem-Solving: Comfort with ambiguity, capable of refining vague tasks into actionable plans by collaborating with stakeholders, asking smart questions, and managing expectations effectively.
Adaptability: Flexibility to pivot between Web2 and Web3 challenges and shifting business priorities, paired with a hunger for continuous learning and self-improvement.
Engineering Excellence: Experience structuring front-end code for security, maintainability, and testability, with a passion for rigorous engineering practices. Hands-on expertise with automated testing is a strong plus.

COMPENSATION & PERKS:
Full-time salary based on experience and meaningful equity in an industry-leading company
Hybrid model working from home & our office in London
Unlimited vacation policy; work hard and take time when you need it
Work from anywhere policy
Apple equipment
The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field
Flexible work culture

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business need at the time.
You may contact our Data Protection Officer by email at dpo@blockchain.com. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.
Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under the standard contractual clauses.

London, United Kingdom

Hybrid

03-04-2025

Company Name: Blockchain.com
Job Title: Senior Web3 Software Engineer, DeFi Wallet
Job Description: Blockchain.com is the world's leading software platform for digital assets. Offering the largest production blockchain platform in the world, we share the passion to code, create, and ultimately build an open, accessible and fair financial future, one piece of software at a time.

We are looking for Kotlin and Solidity Developers with experience on blockchain protocols and EVM networks. As a Back-End Engineer on the DeFi team, you will be working on a wide array of projects, from scaling our non-custodial wallet’s network support to writing smart contracts. Additionally, you will be responsible for integrating with 3rd party vendors that provide data for crypto tokens, DApps and DAOs, as well as efforts to further centralize logic that currently exists on our wallet clients, into backend services.

As a Senior Back-End Engineer you should lead by example - driving the technical discussions, influencing the approach and making a positive impact on the team's development by advocating the best engineering practices.

WHAT YOU WILL DO

Build solid, reliable software to handle multiple networks and support our ever growing family of products and user base
Be a part of a dedicated engineering team committed to applying the highest standards and shipping secure and performant systems
Work in the core of Blockchain.com’s solution, interacting directly with multiple blockchains
Work extensively with open source technologies (Docker, Kafka, MySQL)
Ensure security is at the forefront of everything you do
Work within interdisciplinary teams to continually deliver the highest quality products to our users
Optimize existing systems for scalability, extensibility and performance whilst building out reusable, modular code for use across Blockchain.com's products

WHAT YOU WILL NEED

The foremost quality for this position or any position at Blockchain.com is integrity
Solid experience in Typescript, Solidity
Experience working with Blockchain technologies (EVM or non-EVM chains, and defi protocols)
You are highly motivated, self-driven, and passionate about cryptocurrencies
You know how blockchain systems work, and preferably, you worked closely with at least one
You find your way around a novel problem you haven't faced before
You possess an innate curiosity, you know multiple programming languages, you are a strong advocate for the best engineering practices and thrive on learning new technologies
You take a pragmatic approach to developing clean solutions to complex problems
You pride yourself on consistent high levels of test coverage, strong technical documentation and effective monitoring
You take full responsibility for all the projects you work on

COMPENSATION & PERKS

Competitive full-time salary based on experience and meaningful equity in an industry-leading company
Awesome office location in the heart of Paris - working 4 days in the office is mandatory
Work from Anywhere policy
The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an exciting, emerging industry
Unlimited vacation policy; work hard and take time when you need it
Performance-based bonuses paid in cash
Apple equipment provided by the company

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business needs at the time.

You may contact our Data Protection Officer by email at dpo@blockchain.com. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.

Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under the standard contractual clauses.

Your personal data will be retained by Controller as long as Controller determines it is necessary to evaluate your application for employment. Under the GDPR, you have the right to request access to your personal data, to request that your personal data be rectified or erased, and to request that processing of your personal data be restricted. You also have the right to data portability. In addition, you may lodge a complaint with an EU supervisory authority.

Paris, France

Hybrid

03-04-2025

Company Name: Blockchain.com
Job Title: Senior Software Engineer - KYC & Eligibility
Job Description: Blockchain.com is the world's leading software platform for digital assets. Offering the largest production blockchain platform in the world, we share the passion to code, create, and ultimately build an open, accessible and fair financial future, one piece of software at a time.

As a Senior Software Engineer in the KYC & Eligibility team, you will be responsible for building and optimizing the onboarding and identity verification processes at Blockchain.com. Your work will ensure that customers can seamlessly and securely access our platform while meeting regulatory and compliance requirements. You will collaborate with engineering, compliance, and product teams, integrating third-party identity verification providers such as Sumsub, Veriff, and DXC, to create a scalable, reliable, and efficient onboarding experience.

This role requires strong technical expertise, a problem-solving mindset, and the ability to build systems that are both secure and user-friendly. You will take the lead to design, develop and maintain our onboarding flows, ensuring high availability, low latency, and optimal user experience.

WHAT YOU WILL DO

Technical Execution & Engineering Excellence

Design, develop, and maintain the KYC & Eligibility platform, ensuring scalability, security, and reliability.
Integrate with third-party identity verification providers (Sumsub, Veriff, DXC) and optimize interactions to reduce verification failures and improve user conversion rates.
Write high-quality, maintainable, and efficient code while upholding best practices in software development.
Set guidelines for observability and the monitoring of KYC services, leveraging tools to improve system performance and debugging capabilities.
Work closely with compliance and risk teams to ensure regulatory requirements are met while maintaining a seamless user experience.
Improve fraud detection and prevention mechanisms, ensuring that our onboarding flow remains secure and efficient.
Collaborate with backend and frontend engineers to enhance the end-to-end onboarding experience.
Contribute to technical architecture discussions, ensuring that design choices align with both business goals and system performance.

Collaboration & Cross-Functional Impact

Work closely with engineering, product, and compliance teams to enhance the eligibility and onboarding experience.
Participate in code reviews, offering constructive feedback to maintain code quality and consistency.
Partner with infrastructure teams to improve deployment processes, ensuring high availability and resilience.
Provide technical guidance to junior engineers and collaborate with other teams on shared initiatives.

Continuous Improvement & Innovation

Optimize KYC workflows to balance security, compliance, and user experience.
Identify and resolve performance bottlenecks, ensuring smooth onboarding and verification processes.
Continuously evaluate and improve eligibility-related automation, reducing manual review overhead and enhancing efficiency.
Stay up-to-date with emerging technologies and contribute to process improvements that enhance engineering effectiveness.

WHAT YOU WILL NEED

Technical Skills

Proficiency in JVM languages (Kotlin, Java), Kafka and PostgresSQL
Experience working with identity verification providers such as Sumsub, Veriff, and DXC.
Strong understanding of event driven distributed systems, APIs, and microservices architectures.
Knowledge of observability and monitoring tools to maintain system reliability and performance.
Familiarity with security best practices, particularly in KYC, fraud detection, and compliance systems.
Experience working in high-throughput, low-latency environments where scalability and efficiency are key.
Experience with SQL (Postgres) and NoSQL databases (Redis), ensuring optimal data storage and retrieval for KYC processes.

Collaboration & Communication

Ability to work cross-functionally with Compliance, Risk, Product, and Engineering teams to enhance onboarding flows.
Strong problem-solving and debugging skills, ensuring quick incident resolution and system improvements.
Excellent written and verbal communication skills, ensuring technical discussions are clear and productive.

Preferred Qualifications

Experience working in fintech, crypto, or other highly regulated industries.
Prior work on fraud detection, eligibility, or transaction risk systems.
Exposure to machine learning models or automation techniques for KYC optimization.

COMPENSATION & PERKS

Competitive full-time salary based on experience and meaningful equity in an industry-leading company
Awesome office location in the heart of Paris
Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year.
The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an exciting, emerging industry
Unlimited vacation policy; work hard and take time when you need it
Performance-based bonuses paid in cash
Apple equipment provided by the company

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business needs at the time.

You may contact our Data Protection Officer by email at dpo@blockchain.com. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.

Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appr...

Paris, France

Remote

07-04-2025

Company Name: Blockchain.com
Job Title: Senior Backend Engineer, DeFi Wallet
Job Description: Blockchain.com is the world's leading software platform for digital assets. Offering the largest production blockchain platform in the world, we share the passion to code, create, and ultimately build an open, accessible and fair financial future, one piece of software at a time.

We are looking for a proactive, thorough Senior Software Engineer to help build our Defi platform. You will play a critical role in building financial and crypto-native products, services and APIs.
As a Senior Back-End Engineer you should lead by example - driving the technical discussions, influencing the approach and making a positive impact on the team's development by advocating the best engineering practices.

WHAT YOU WILL DO
Build on our DeFi wallet platform, expanding support for multiple networks
Develop and integrate APIs from new and existing services, to our various product applications.
Be a part of a dedicated engineering team committed to applying the highest standards and shipping secure and performant systems,
Work in the core of Blockchain.com’s solution, interacting directly with multiple blockchains and internal services,
Work extensively with open source technologies (Docker, Kafka, PostgreSQL),
Ensure security is at the forefront of everything you do,
Work within interdisciplinary teams to continually deliver the highest quality products to our users,
Optimise existing systems for scalability, extensibility and performance whilst building out reusable, modular code for use across Blockchain’s products.

WHAT YOU WILL NEED
The foremost quality for this position or any position at Blockchain.com is integrity,
You are highly motivated, self-driven, passionate about crypto currencies,
You know how blockchain systems work, preferably, you worked closely with two
You find your way around when confronted to a novel problem not many people faced before,
You possess an innate curiosity, you know multiple programming languages, you are a strong advocate for the best engineering practices and thrive on learning new technologies,
You take a pragmatic approach to developing clean solutions to complex problems,
You pride yourself on consistent high levels of test coverage, strong technical documentation and effective monitoring,
You take full responsibility for all the projects you work in,
Preferably experience in at least one JVM based language such as Java, Kotlin, Scala or willing to learn these languages.

COMPENSATION & PERKS
Full-time salary based on experience and meaningful equity in an industry-leading company
Hybrid model working from home & awesome office location in the heart of London
Unlimited vacation policy; work hard and take time when you need it
Apple equipment
The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field
Flexible work culture

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business need at the time.
You may contact our Data Protection Officer by email at dpo@blockchain.com. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.
Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under the standard contractual clauses.

London, United Kingdom

Hybrid

13-04-2025

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