Senior Full-Stack Engineer – Banking Integrations

Pretto

. Own the end-to-end interaction with banks, from submitting an application file through processing the response .

Posted 9/24/2026full-timeParis • FranceSenior💰 €65,000 - €70,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and maintaining bank API connectors, ensuring code quality and reliability in critical workflows. Possesses strong understanding of the residential mortgage business and the ability to collaborate effectively with multidisciplinary teams.

Highest-signal resume keywords

API IntegrationSoftware EngineeringBanking RelationshipsResidential Mortgage BusinessProduct Collaboration

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

API DesignCode Quality AssuranceWorkflow InstrumentationData Extraction Using LLMsThird-Party System IntegrationError HandlingReconciliation ProcessesApplication File ProcessingFeature DesignTechnical Communication

Soft Skills

Creative Problem SolvingProactive CollaborationIndependent WorkRigorous AnalysisCuriosity

Industry Keywords

Lending CriteriaBanking TechnologyBusiness Domain KnowledgeApplication Submission MonitoringMultidisciplinary Team Collaboration

Tech Stack

Tools & technologies

Flux

About the role

Key responsibilities & impact

Own the end-to-end interaction with banks, from submitting an application file through processing the response
Maintain and design new features within the functional scope
Ensure code quality, architecture, and the reliability of critical workflows
Serve as the technical point of contact for banking relationships with the Banking Division and banking technology teams
Design and industrialize bank API connectors on a bank-by-bank basis
Improve the reliability of processing, matching, and historical tracking of banks’ responses and emails
Extract information using LLMs
Understand lenders’ approval processes and partners’ expectations, and translate them into product features
Instrument workflows and monitor submission times, failure rates, and application-file quality
Share business-domain knowledge with product and operations teams
Collaborate with a multidisciplinary team comprising back-end/front-end developers, a product manager, a designer, and a data scientist

Requirements

What you’ll need

At least 5 years of experience as a software engineer
Experience integrating with third-party systems
Experience working with evolving API contracts, retryable errors, and states requiring reconciliation
Understanding of the residential mortgage business, lending criteria, and banks’ expectations
Ability to communicate with business teams and external partners
Product-minded approach, with a natural ability to collaborate with product managers and designers
Creative and proactive, with the ability to put forward ideas
Independent, rigorous, and curious

Benefits

Comp & perks

A demanding yet supportive tech and product team where you can grow quickly
An ideal environment for applied AI: a company reinventing itself with LLMs
Swile card (50% covered by the company)
Gymlib membership
Regular events: after-work gatherings, team lunches, monthly parties, and sports activities
Hybrid working policy
Full ownership of your scope