Senior API & Integration Engineer

Senior API & Integration Engineer# Senior API & Integration Engineer Remote - Tulsa, OK 74120## Overview Position Type Full Time Category Information  Technology## Description
** Vast Bank is looking to hire an Senior API & Integration Engineer*!
***** About Vast Bank
** Since February of 1982, we've been a financial institution that has served customers in Northeast Oklahoma and beyond. Our deep roots in the community and commitment to personal service have enabled us to grow alongside our customers, creating conveniences and solutions to fit unique problems and lifestyles. For over 40 years, we've built a legacy on personal service, flexibility, strength, and integrity.

Now, with bold leadership and a renewed commitment to customer-centricity, we're aiming higher for the next 40 years. New ideas, strong partnerships, and modern technology will accompany a winning culture to deliver more control and a surprisingly easy banking experience.

We're a company that believes in taking care of the people who make working here possible. In addition to competitive compensation, we offer a leading employee benefit package:
* Comprehensive benefits package & 401(k) match
* Professional development
- ** opportunities for advancement!
*** Tuition assistance
* Transit reimbursement
* Paid time off* **& more!**## Qualifications
** Summary Of Role
** The Senior API & Integration Engineer is a hands-on technical role responsible for designing, developing, securing, and supporting integrations that connect Vast Bank’s core banking, payments, treasury, sponsor banking, digital, and enterprise platforms. The position builds reliable APIs, event-driven services, and file-based interfaces that enable business growth, improve data flow, and reduce manual processing. This senior individual contributor partners with IT leadership, Information Security, business teams, and technology providers to deliver maintainable solutions within established architecture, change management, and risk controls.
** Major Duties and Responsibilities
*** Design, develop, and maintain secure integrations across core banking, payments, treasury, sponsor banking/FBO, digital channels, and internal applications using APIs, webhooks, messaging, and managed file transfers.
* Build and support connections with bank technology providers and cloud services, including platforms such as FIS Code Connect, Fintech platforms, and AWS, based on approved business requirements and vendor capabilities.
* Translate business requirements into technical designs, interface specifications, data mappings, and reusable integration components; document dependencies, ownership, and acceptance criteria with business and project teams.
* Establish and maintain API contracts, versioning, validation, authentication, authorization, rate limits, and lifecycle documentation in alignment with approved architecture and security standards.
* Engineer reliable processing through appropriate use of idempotency, duplicate detection, retries, timeouts, exception queues, reconciliation controls, and recovery procedures to reduce lost, incomplete, or duplicate transactions.
* Implement secure coding, least-privilege access, encryption, secrets management, and appropriate audit logging; protect customer and bank information and avoid exposing sensitive data in logs or non-production environments.
* Develop automated unit, integration, contract, regression, and failure-recovery tests; coordinate end-to-end testing and business acceptance before implementation.
* Use source control, peer review, and automated deployment pipelines; follow approved release, rollback, and change management procedures, maintaining separation between development, approval, and production access.
* Monitor integration availability, latency, throughput, failures, and reconciliation exceptions; troubleshoot incidents, conduct root-cause analysis, and implement corrective actions with internal teams and vendors. Participate in scheduled after-hours releases and incident response as required.
* Maintain interface inventories, architecture diagrams, support runbooks, and recovery documentation; cross-train team members and provide technical mentoring to reduce key-person dependencies.
* Partner with data and reporting teams to deliver validated source data to approved downstream platforms, preserving data lineage, quality checks, and clear system-of-record ownership.
* Support vendor technical evaluations, continuity testing, and audit or examination…