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Senior Backend / Product Engineer — Fintech (Lending & Ledger) at Pesto | Jobyssey

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Senior Backend / Product Engineer — Fintech (Lending & Ledger)

Senior Backend / Product Engineer — Fintech (Lending & Ledger)

Pesto · 3 months ago

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Seniority: Senior
Category: Backend

api aws cdk data-modeling datadog elixir erlang fintech graphql observability postgresql ruby

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We're a small team building a live consumer credit product — a dynamic credit card: application funnel, KYC/credit decisioning, a double-entry ledger, statements, payments, and ACH. You'll own backend systems where correctness with money is the whole job. You'll help shape the product itself as well. You need strong product judgement.

You'll work on

Services that move money and reconcile against a ledger that is the system of record
Integrations with credit-decisioning, card-issuing, ACH, and KYC/AML providers
Cross-service contracts (async, queue-based) where a malformed message is a production incident
GraphQL APIs powering a mobile app, plus the batch/job pipelines behind statements and payments
Product design and implementation across the member experience, from application flow through servicing and repayment

Must have

Strong backend fundamentals: data modeling, Postgres, async/queue-driven systems, idempotency, and designing for failure
Comfort owning a feature across the stack: DB → API → infra → tests → deploy → monitoring
The ability to operate with incomplete requirements and drive a problem to a concrete outcome

Strongly preferred

Financial/fintech experience — ledgers, double-entry accounting, payments/ACH, lending, or card issuing. You understand why "close enough" is a bug.
Product-engineer instincts — you scope from the user's problem, not just the ticket; you push back on unnecessary work, challenge assumptions, and cut features that don't pull their weight
Experience building products in a startup environment where engineers are expected to contribute to both product direction and implementation

Nice to have

Elixir / Phoenix / Absinthe / Oban (or genuine enthusiasm to ramp — strong Ruby/Erlang/functional folks adapt fast)
AWS (we use CDK), infra-as-code, observability (Datadog)
Experience with regulated/compliance-sensitive systems (PCI, KYC/AML, Reg B)