Full-Time

Reverse Engineer

Teller

Teller

11-50 employees

Real-time bank data API for developers

No salary listed

London, UK + 1 more

More locations: Miami, FL, USA

Hybrid

Category
Software Engineering (2)
,
Required Skills
reverse engineering
REST APIs
Requirements
  • Demonstrable experience of reverse engineering mobile applications.
  • Live and work in a timezone compatible with US/UK working hours.
Responsibilities
  • Reverse engineer mobile banking applications to enable continued addition of bank integrations to Teller's API.
Desired Qualifications
  • Persuasive communicator who is succinct and direct, and who is clear about what you are doing, why, and what you expect of others.
  • Strong ownership mentality; you take total responsibility for your work and consider the bigger picture like a product manager.
  • Thrive in environments with high levels of responsibility and autonomy.
  • Desire to fulfil your potential and grow as an engineer to be the best you can be.
  • Ability to learn new skills quickly when a required skill is missing for a task.
  • Results-oriented with a strong distaste for shaving yaks.
  • Strong opinions, weakly held, with the humility to change your mind based on evidence.

Teller provides a real-time bank data API for developers and businesses in fintech. It connects directly to banks via official APIs, avoiding slow, unreliable screen scraping to ensure faster, more accurate data retrieval. The product is accessed through a subscription-based API, where clients pay for a certain number of API calls per month and can scale usage as needed. Teller differentiates itself by offering direct bank integrations with high uptime and stable data, unlike competitors that rely on less stable methods. The goal is to deliver dependable, real-time banking data at scale to fintechs, financial institutions, and other businesses that need smooth integration with banking data.

Company Size

11-50

Company Stage

Seed

Total Funding

$4M

Headquarters

London, United Kingdom

Founded

2019

Simplify Jobs

Simplify's Take

What believers are saying

  • Users maintain longer connections, reducing churn significantly.
  • Single API connects to 3+ US institutions with standardized interfaces.
  • Subscription model scales revenue with client API call volumes.

What critics are saying

  • Plaid's 80% dominance locks Teller out of enterprise contracts.
  • JPMorgan and Bank of America deprecate APIs, bypassing aggregators.
  • FedNow adoption erodes Teller's payment revenue in 12-18 months.

What makes Teller unique

  • Teller uses direct bank APIs instead of unreliable screen scraping.
  • Bridge enables Zelle integration for neobanks issuing debit cards.
  • mTLS and OAuth2 secure connections without exposing user credentials.

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Benefits

Stock Options

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

-3%

1 year growth

-7%

2 year growth

4%
Fintech Global
Jan 28th, 2020
Banking API company Teller announce new $4m seed round to take...

Venture capital Lightspeed Ventures, Founders Fund and PayPal founder Max Levchin's SciFi VC have joined forces to back banking API provider Teller’s new

TechCrunch
Jan 27th, 2020
Teller raises $4M to take on Plaid in the U.S. by providing API access to bank accounts

“They’re idiots, they’re really naive,” is how Stevie Graham, the co-founder of fintech Teller, once described Open Banking Limited, the body charged with delivering open banking in the U.K. His view back in 2017 — which now looks somewhat prophetic — was that open banking wouldn’t be the competition driver it was hyped up to […]