Software Development Engineer in Test, Phantom
Wallet Platform
Crypto wallet built for DeFi & NFTs
Be an early applicant
Crypto wallet built for DeFi & NFTs
201-500 employees
Be an early applicant
201-500 employees
Company mission
To make the digital economy safe and easy to use for everyone.
Role
Who you are
- Strong proficiency in at least one of: Python, TypeScript/JavaScript, Go
- Experience designing and building test frameworks from scratch (not just adding tests to an existing suite)
- Deep familiarity with API testing — REST, webhooks, idempotency, retry behavior, edge cases at integration boundaries
- Working knowledge of databases (SQL) and the ability to write test data seeding/cleanup logic correctly
- Experience testing payment flows, ledger systems, or compliance pipelines
- Understanding of idempotency, double-spend prevention, and eventual consistency in distributed systems
- Familiarity with webhook-based event systems and out-of-order delivery scenarios
- Experience integrating test suites into CI pipelines (GitHub Actions, GitLab CI, or similar)
- Ability to instrument tests for flakiness detection, coverage tracking, and runtime performance
- Comfort operating in a cloud environment (AWS, GCP) and reading service logs/traces
- You can define what "this test passing" actually means in production terms
- You've contributed to or owned an incident post-mortem with concrete prevention steps
- You understand canary deployments, feature flags, and how to write tests that survive staged rollouts
- We strongly encourage candidates of all different 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
What the job involves
- We're looking for an SDET for a 6 month contractor position who thinks like an engineer and tests like one too
- You won't be writing test cases in a spreadsheet. You'll be designing and owning test infrastructure for financial-grade systems — payment flows, KYC pipelines, card transaction handling, and the compliance rails that underpin them
- This is not a QA role. It's an engineering role that happens to own quality as its primary output surface. You will work embedded in a team that ships production financial software at startup velocity. That means your job is to make speed and correctness coexist — not to be the brake pedal
- Own test coverage for their squad's features end-to-end (unit, integration, E2E)
- Build and maintain automated test suites for new and existing functionality
- Run manual and exploratory testing on features before release
- Write reliable, maintainable automated tests (UI, API, regression)
- Contribute to the shared test automation framework
- Integrate tests into CI/CD pipelines and ensure they run reliably on every PR/deploy
- Define and document QA standards within their squad
- Review PRs for testability and test coverage gaps
- Flag flaky tests and own resolution
- Partner with product engineers to shift testing left (writing tests alongside features, not after)
- Work with PM/design to clarify acceptance criteria before dev begins
- Surface quality risks and blockers early in the sprint
- Your first 90 days will likely include:
- 30 days: map current test coverage against known failure modes; identify the top 3 gaps; ship at least one meaningful test suite that catches a real class of bugs
- 60 days: own CI quality gates for at least one pod's test suite; establish baseline metrics (coverage %, flakiness rate, regression detection latency)
- 90 days: reduce bug escape rate measurably; present a test infrastructure roadmap to the team
- How We Measure Success
- Bug escape rate (regressions caught in test vs. caught in production)
- Time-to-detection for regressions (commit to test failure)
- Test flakiness rate (< 2% target)
- Manual testing time eliminated via automation
- CI pipeline reliability and run time
Our take
Cryptocurrency wallets provide a way to protect secret information that gives users control over your digital assets. Many crypto enthusiasts prefer the wallet option as non-custodial wallets remove the third-party option and users gain full control over their data. Phantom is a cryptocurrency wallet that creates a space for users to buy, send, receive, swap tokens and collect NFTs.
Phantom hosts the Solana blockchain, though Ethereum is generally more popular within the crypto world, Solana is said to have faster speeds and lower transaction costs. Offering the same wallet features as its competitors, the company is setting itself apart with newer features like the “Burn NFTs” feature allowing users to remove spam NFTs sent by attackers and support them in dodging NFT theft prevalent in the sector. The company prides itself on extremely high-security factors.
Founded in 2021, the company has an impressive firm valuation of $3B and has earned its place as a top-rated crypto wallet. As the crypto space continues to evolve, Phantom is positioning itself not just as a wallet, but as a comprehensive platform for managing the full range of digital assets and decentralized applications.
Freddie
Company Specialist at Welcome to the Jungle
Company
Funding (last 2 of 3 rounds)
May 2022
$12m
SERIES A
Dec 2021
$4m
SEED
Total funding: $16.3m
Company benefits
- Daily meal benefit
- Unlimited PTO
- Comprehensive health plans
- Learning & development
- Montlhy wellness benefit
- Global company offsites
Company HQ
SoMa, San Francisco, CA
Leadership
Brandon Millman
(Co-Founder & CEO)An extensive background in Engineering, most recently working as Senior Engineer at Twitter and Engineering Manager/Tech Lead 0x.
Chris Kalani
(Co-Founder & CPO)Previously worked as a Product Designer at Facebook, went on to co-found and become CEO of Wake. Is currently an Advisor at Talentdrop.
Francesco Agosti
(Co-Founder & CTO)Worked as a Software Engineer at Yelp, and went on to work through several roles at 0x, most recently as Tech Lead.
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