Software Engineer, Frontend / Full Stack (Identity Platform)
Phantom · United States
- Hybrid
- Full-time
- $150,000 / year
- United States
Job highlights
- Build secure authentication and transaction signing.
- Develop TypeScript across web and mobile.
- Enhance security with passkeys and MFA.
- Manage key lifecycle and user onboarding.
- Ensure reliability with robust testing.
About the role
About Phantom
Phantom is the modern money app used by tens of millions around the world. Our product combines everything people need to manage, spend, and grow their money in one simple, intuitive experience. Phantom brings all the control and flexibility of crypto-powered finance, without unnecessary complexity, into mainstream consumer finance.
By combining industry-leading security with thoughtfully designed tools, Phantom makes powerful financial tools feel approachable and easy to use. This focus on speed, control, and user experience has fueled rapid growth, with a community of 20M+ people, reaching #1 in the Google Play Store finance category, and consistently ranking as a Top 50 app across all categories, alongside some of the most recognizable consumer technology platforms in the world.
Role Description
Identity Platform is the trust root of Phantom: we own authentication, unlocking, onboarding/key generation, and the signing pipeline that every transaction flows through. This is a business-critical area where bugs can lock users out or put funds at risk. You'll ship TypeScript across browser, Node.js, and mobile runtimes (e.g., Hermes) to keep these foundations fast, secure, and reliable.
Responsibilities
- Own and evolve the signing path for every transaction in Phantom.
- Build and harden authentication, unlocking, biometrics, and account access flows across web and mobile.
- Ship passkeys (WebAuthn) and MFA improvements with a strong security/usability balance.
- Own onboarding and key lifecycle flows: key generation/derivation, seed phrase flows, seedless registration, hardware wallet pairing.
- Own sensitive key export/import experiences and related safety rails.
- Write and maintain high-signal, non-flaky tests (unit/integration/e2e) for critical paths; ensure safe rollouts via monitoring and staged releases.
Qualifications
Must-have
- 7+ years of experience
- Strong TypeScript skills; comfortable shipping code across browser, Node.js, and mobile JS runtimes.
- Proven ability to build high-signal, low-flake test suites for critical systems.
- Familiarity with auth concepts and common mechanisms (sessions/tokens, MFA/OTP, WebAuthn/passkeys)
- Strong engineering fundamentals: system design, debugging, and production reliability.
Nice-to-have
- Deeper experience with OAuth2/OIDC, WebAuthn internals, cryptography, or key management systems.
- Web3/wallet or signing-flow experience.
- Security- or money-adjacent experience (identity, payments, custody).
- Rust experience (or strong interest in learning it).
Why Work with Us
We are a team of experienced builders in the blockchain and crypto industry. Our journey began from users seeking an easy, seamless path to accessing the crypto ecosystem. This passion fueled our exponential growth, allowing us to onboard over 20M+ active users in just over three years; with our user base growing weekly. Our dedication to a secure and seamless user experience has made us the leading wallet on Solana as well as our multi-chain approach enhances our platform's versatility, meeting the needs of a diverse and growing user base. By staying at the forefront of technology and user expectations, we continue to innovate and set industry standards on self-custodial crypto wallets.
There has never been a better time to work in crypto to help shape the future of innovation with a focus around the wallet experience!
- First impressions matter: Wallets are responsible for a users first impression with crypto and onboarding new users into crypto. By ensuring that a user has a great first-time experience with crypto, we can help supercharge the growth of the entire ecosystem.
- Make crypto easier to navigate: There is no easy way for a user to discover and navigate all that crypto has to offer. Wallets have a unique opportunity to help users not only onboard to crypto but also stay retained by exploring new things to do.
- We live in a multi-chain world: We currently support Solana, Ethereum, Polygon and Bitcoin with more networks to come in the new future. We are focused on creating a unified, multi-chain crypto experience for users.
Benefits
- Competitive salary and equity
- Comprehensive insurance (medical/dental/vision) — 100% covered
- Stipend for your ideal remote set-up
- Flexible hours and a supportive remote environment
- Unlimited vacation: Take time when you need it (and we really mean it!)
- 401(k) retirement plan
- Monthly wellness benefit
- Weekly meal benefit
- Global off-sites
We strongly encourage candidates of all backgrounds to apply. We believe that our work is stronger with a variety of perspectives, and we’re eager to further diversify our company. If you have a background that you feel would make an impact at Phantom, please consider applying. We’re committed to building an inclusive, supportive place for you to do the best work of your career.
By submitting your resume and application materials, you acknowledge and agree that Phantom Technologies, Inc. ("Phantom") collects and processes your personal information (including application materials, interview records, and related data) to evaluate your candidacy. Phantom may use AI-powered tools and third-party service providers for transcription, note-taking, scheduling, and other administrative tasks. Phantom does not sell your information and your materials will be handled securely and in accordance with applicable data protection laws. To learn more or for any questions, contact privacy@phantom.app.
Key skills/competency
- Software Engineer Frontend Full Stack
- TypeScript
- Node.js
- Browser Runtimes
- Mobile Runtimes
- Authentication
- WebAuthn
- MFA
- Key Management
- System Design
Skills & topics
- Software Engineer
- Frontend Developer
- Full Stack Developer
- TypeScript
- Node.js
- Browser
- Mobile
- Authentication
- WebAuthn
- MFA
- System Design
- Production Reliability
- Crypto
- Finance
- Identity Platform
How to get hired
- Tailor your resume: Highlight 7+ years of TypeScript experience and system design skills. Emphasize experience with authentication, WebAuthn, and building reliable test suites for critical systems.
- Showcase security focus: Detail your experience with MFA, key management, and secure coding practices. Mention any Web3, crypto, or identity-adjacent work.
- Prepare for technical interviews: Brush up on system design, debugging, and production reliability. Be ready to discuss your approach to building high-signal, low-flake tests.
- Understand Phantom's mission: Research Phantom's role in the crypto ecosystem and their focus on user experience. Connect your skills to their goal of making crypto accessible and secure.
- Express interest in Rust: If you have Rust experience or a strong desire to learn it, be sure to mention it.
Technical preparation
Behavioral questions
Frequently asked questions
- What is the core responsibility of a Software Engineer on the Identity Platform team at Phantom?
- As a Software Engineer on the Identity Platform team at Phantom, your core responsibility will be to own and evolve the critical systems that handle authentication, unlocking, key generation, and the transaction signing pipeline. This involves ensuring these foundational elements are fast, secure, and reliable across browser, Node.js, and mobile environments.
- What technical skills are essential for this Software Engineer role at Phantom?
- Essential technical skills for this role include strong TypeScript proficiency across browser, Node.js, and mobile JavaScript runtimes. You'll also need proven experience in building high-signal, low-flake test suites for critical systems, alongside strong engineering fundamentals in system design, debugging, and production reliability. Familiarity with authentication concepts like sessions, tokens, MFA, and WebAuthn is also a must-have.
- Does Phantom encourage learning new technologies for their Software Engineers?
- Yes, Phantom encourages learning. While strong TypeScript skills are required, experience or a strong interest in learning Rust is considered a plus, indicating a willingness to explore and adopt new technologies to enhance their platform.
- What kind of impact can a Software Engineer have at Phantom?
- As part of the Identity Platform team, you'll have a significant impact by safeguarding the 'trust root' of Phantom. Your work directly influences user security, fund protection, and the overall reliability of the platform, which is crucial for Phantom's mission to make crypto finance accessible and user-friendly.
- What are the benefits of working at Phantom as a Software Engineer?
- Phantom offers competitive compensation including salary and equity, comprehensive 100% covered insurance, a remote work stipend, flexible hours, unlimited vacation, a 401(k) plan, and monthly wellness and meal benefits. They also organize global off-sites.
- How does Phantom approach diversity and inclusion for Software Engineer roles?
- Phantom strongly encourages candidates from all backgrounds to apply, believing that diverse perspectives strengthen their work. They are committed to building an inclusive and supportive environment where everyone can do their best work.
- What is Phantom's stance on remote work for Software Engineers?
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