Full-Stack Engineering Intern, Mercury
12 - 16 Week Fall 2026 Internship
$55 USD per hour. $55 CAD per hour
Banking services for startups and small businesses
Be an early applicant
Banking services for startups and small businesses
1001+ employees
Be an early applicant
$55 USD per hour. $55 CAD per hour
1001+ employees
Company mission
To make scaling tech companies simpler with a personalized banking stack for startups, and power the next generation of companies that will shape the American industry.
Role
Who you are
- Be interested in continually honing their craft
- Have curiosity and be willing to share their perspective
- Appreciate quality in their work and that of others
- Communicate well, and be able to write clear explanations of their reasoning on technical decisions
- Backend Engineering Interns should have experience using the Haskell programming language, or a strong desire to learn it, and have some familiarity with SQL
- Frontend Engineering Interns should have experience with the TypeScript programming language, and experience with React is a plus
- Full-stack Engineering Interns should have experience using the Haskell programming language, or a strong desire to learn it, some familiarity with SQL, and experience using the TypeScript programming language
- Our internship program is intended for individuals enrolled in an academic program (undergraduate, graduate, etc.)
What the job involves
- We think Davy’s sacrifice was worth it, though, since Faraday went on to do experimental work in the field of electromagnetism that is foundational to innumerable modern technologies. While we can’t promise you’ll become the next Faraday, we can promise you won’t be asked to deal with explosives on the job
- Instead, you’ll be receiving mentorship from experienced engineers, writing TypeScript and/or Haskell code, and contributing to a product that serves over 100,000 businesses
- As an Engineering Intern, you’ll join a team that aligns with your goals and interests. During the interview process, you’ll have the opportunity to talk through the various team openings
- Backend Engineering Interns:
- Collaborate with data analysts to spec and build features that draw new customers to our product
- Provide a backend to our mobile and web frontends, to do things like search transactions or send wire transfers
- Build admin tools to increase the efficiency of day-to-day support operations, like identifying fraudulent customers or managing accounts
- Integrate with third-party APIs, to do things like send checks or validate SWIFT codes
- Frontend Engineering Interns:
- Work on a beautiful app: Since many of our customers are startups, they appreciate a well-implemented design. We have high standards for our UI, and we think it shows on our website. We encourage you to sign up and check out our onboarding experience, or read our blog post about our date picker
- Push the limits of TypeScript: As a financial technology company, preventing errors is a top priority for us, and we take advantage of TypeScript’s advanced static typing features to prevent them
- Work in an established codebase that still has room for growth. Across 650K lines of TypeScript, we’ve built abstractions and components that will give you leverage to build great features during your months at Mercury. But there’s still a lot more to build, be it optimizing the scrolling performance of a combobox, or building whole pages to deliver a feature to customers
- Exercise ownership over the product: Our engineers work closely with our designers and contribute their own ideas to make the product better
- Full-stack Engineering Interns:
- In this role, you can expect to do a combination of the frontend and backend work that is described above
- This is a paid full-time remote summer internship for 12-16 weeks between September and December
Application process
- Applications close on March 6, 2026. Please apply only to the single intern position that best aligns with your qualifications and interests
Our take
Frustrated by the archaic, fee-laden banking services offered to entrepreneurs, the founders of Mercury set out to create a better solution. They envisioned a platform that was dynamic, tech-driven, and free from unnecessary fees.
Mercury delivers on this vision by automating business payment processes, offering FDIC-insured accounts, and providing full API access, empowering entrepreneurs with greater control and efficiency. This approach stands in stark contrast to traditional startup banking, which often burdens young businesses with high fees and limited functionality.
By prioritizing user experience and offering a free service tier, Mercury has attracted over 200,000 businesses and achieved a $3.5B valuation as of 2025. As a rising unicorn in the stagnant world of startup banking, mercury is backed by substantial funding and poised for continued growth, constantly adding new features and expanding its team to further disrupt the industry.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
50% employee growth in 12 months
Company
Funding (last 2 of 5 rounds)
Mar 2025
$300m
SERIES C
Jul 2021
$120m
SERIES B
Total funding: $450.9m
Company benefits
- Health, dental, & vision
- 12+ weeks of paid parental leave
- $600 USD custom WFH equipment setup
- Unlimited vacation policy (with a mandatory minimum)
- Annual $1K learning & development budget
- Paid 6-week sabbatical after the 5-year mark
- Weekly $100 food budget
- Monthly $100 wellness budget
- Monthly $50 cellphone reimbursement
- Pet-friendly offices with free tea and beverages, plus lunch and snacks
- Unlimited vacation policy (with a mandatory minimum)
- Retirement matching up to 4% of base salary (401K/RRSP)
- Inclusive fertility, hormonal health, and family-forming benefits through Carrot Fertility
Company HQ
SoMa, San Francisco, CA
Leadership
Jason Zhang
(Co-Founder & COO)Jason graduated from Stanford University with a Bachelor of Science in Biology before spending over 4 years at Heyzap in Business Development.
Immad Akhund
(Co-Founder & CEO)Immad graduated from the University of Cambridge with a Masters in Computer Science. He then worked as a Software Developer at Aquila and Bloomberg. He also founded Clickpass and Heyzap, and was a Part-time Partner at Y Combinator.
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