Software Development Engineer in Test, Phantom
Money Movement
+ Equity
Crypto wallet built for DeFi & NFTs
Open for applications
Crypto wallet built for DeFi & NFTs
201-500 employees
Open for applications
+ Equity
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
What the job involves
- We're looking for an SDET 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
- Test automation platform for Money Movement: end-to-end tests, API contract tests, integration test suites covering funding rails, card transactions, KYC flows, and Cash account operations
- CI/CD quality gates: design, implement, and maintain test pipelines that run on every PR and block regressions from reaching production
- Failure mode coverage: model the real failure modes — duplicate charges, partial KYC completions, webhook replay, idempotency violations, provider outages — and build tests that catch them before users do
- Performance and load testing: validate that payment flows hold up under peak load; identify latency regressions before they hit p95 in production
- Test data and environment infrastructure: own the tooling that makes tests repeatable, isolated, and fast
- Observability for test quality: track test coverage, flakiness rates, bug escape rates, and regression detection latency as real metrics with real owners
- The Money Movement team's current test coverage has gaps in areas that matter most: KYC state machine transitions, on-ramp provider failure paths, and card authorization edge cases. These aren't nice-to-haves. They're reliability debt that creates customer impact and slows engineering velocity
- 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
- Red Flags We Screen For:
- Test suites that only cover the happy path
- No incident ownership story ("QA doesn't do oncall")
- Can't reason about failure modes, retries, or idempotency at the code level
- Treats test coverage % as the goal rather than a signal
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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