Senior Software Engineer - Banking Integration Platform
AI summary of the role
Senior engineer on Mercury's Banking Integration Platform team, building the integration layer between Mercury's modern systems and FFIEC-approved bank cores and payment networks.
What you’ll do
- Build Mercury’s integration with an FFIEC-approved bank core and the connections to payment networks.
- Design internal APIs that give product teams simple, consistent interfaces to complex external systems.
- Handle the messy realities of enterprise integrations such as retries, failures, format mismatches, and downtime.
- Build data pipelines that keep Mercury's systems in sync with our bank core.
What you’ll bring
- Direct experience with either a bank core that has achieved FFIEC-compliance (such as FIS) or that of a US-based Global Systemically Important Bank (G-SIB).
- Understand how core banking systems work: accounts, transactions, ledgers, and the data models underneath.
- Be a product-minded engineer who thinks about the developers consuming your APIs.
- Be comfortable with our tech stack (Haskell and TypeScript) or ready to learn.
Technologies
Haskell · TypeScript · FFIEC-approved bank core · FIS · payment networks · data pipelines · monitoring · alerting · APIs
About Mercury
Banking and financial-operations platform built for startups and small businesses, offering checking, savings, treasury, credit cards, bill pay, venture debt, and payroll.
Series C
Source and classification
Internal deployment & tooling · Evidence for this classification:
When the Space Shuttle approached the International Space Station, two vehicles built by different teams, in different countries, with fundamentally different engineering philosophies and systems, had to connect perfectly. The Rendezvous, Proximity Operations, and Docking (RPOD) subsystems were engineered to handle complex mismatches such as different power systems, communication protocols, and technical architectures. Get it wrong, and you have an expensive and potentially catastrophic problem in low Earth orbit. Mercury announced on December 19, 2025 that we submitted an application to the OCC for a national bank charter and applied for FDIC deposit insurance. In other words, Mercury is building a bank. As part of this work, we will be connecting our modern, product-focused engineering systems to enterprise core banking systems and payment networks built in a different era, with
More from the job description
When the Space Shuttle approached the International Space Station, two vehicles built by different teams, in different countries, with fundamentally different engineering philosophies and systems, had to connect perfectly. The Rendezvous, Proximity Operations, and Docking (RPOD) subsystems were engineered to handle complex mismatches such as different power systems, communication protocols, and technical architectures. Get it wrong, and you have an expensive and potentially catastrophic problem in low Earth orbit. Mercury announced on December 19, 2025 that we submitted an application to the OCC for a national bank charter and applied for FDIC deposit insurance. In other words, Mercury is building a bank. As part of this work, we will be connecting our modern, product-focused engineering systems to enterprise core banking systems and payment networks built in a different era, with different assumptions and different interfaces. Mercury’s Banking Integration Platform as a Service team is like NASA’s RPOD team, building our integration subsystems that are technically correct and operationally trustworthy. This is some of the most consequential infrastructure work at Mercury. Every account opening, every monetary transaction, and every balance call will flow through the systems you build. Product teams across the company will depend on clean abstractions that hide the complexity [... source excerpt omitted ...] ovey as part of our hiring and / or promotional process for jobs in NYC and certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on January 22, 2024. [Please see the independent bias audit report covering our use of Covey for more information.] #LI-ES1
Employer postings · Data from · Sources