How a Fintech Startup Built a Production-Grade ACH Payments Platform From Concept to Launch
A real estate–focused fintech startup set out to modernize how funds move between parties in complex real-estate transactions. Starting with only a product concept and no existing technical foundation, the company partnered with Step 7 Consulting to architect, build, and deploy a secure, cloud-native SaaS platform for ACH payments—integrating bank connectivity, identity verification, approval workflows, and multi-party payment orchestration.
Outcome: A production-ready fintech platform that replaced manual, check-based workflows with automated, auditable ACH payments and established a scalable foundation for future AI-driven automation and workflow enhancements.
Client Background
The client was an early-stage fintech startup with a vision to modernize real-estate payment workflows but no existing platform, architecture, or production systems. The team required a technical partner capable of translating a complex product idea into a secure, scalable, real-world fintech application.
Step 7 was engaged from the outset to lead the engineering team, providing it’s resources as well as recruiting others as needed, and owning all aspects of software engineering—from defining the platform architecture and technical specifications to designing workflows, breaking work into concrete engineering deliverables, managing sprints, and driving the implementation through production deployment.
Throughout the engagement, Step 7 worked in close partnership with the startup’s leadership team, conducting regular strategy sessions to align technical execution with business objectives, validate product decisions, and ensure the platform would meet market demands. This collaborative approach enabled rapid pivots when market feedback required adjustments, while maintaining architectural integrity and delivery momentum.
Challenges
Real-estate payment workflows are inherently complex. Each transaction involves multiple parties, funding dependencies, approval requirements, and strict reliability expectations—all within a regulated financial environment.
Key challenges included:
- No existing technical architecture or infrastructure
- Manual, error-prone workflows reliant on paper checks and spreadsheets
- Securely connecting bank accounts across diverse financial institutions
- Verifying identity and account ownership without handling sensitive credentials
- Reliably matching inbound funds to outbound ACH payments
- Enforcing human approval controls while maintaining automation and speed
- Orchestrating multi-party ACH payments with full auditability and observability
Solution
Step 7 Consulting designed and built a secure, cloud-native SaaS platform that manages the full lifecycle of ACH payments—from funding intake through final settlement—while enforcing strong security controls and human oversight.
Engineering Leadership & Delivery
Step 7 Consulting served as the technical leadership and delivery organization for the fintech platform.
Beyond architecture and implementation, Step 7 led and managed the full, cross-functional development team, spanning:
- Solution and systems architecture
- Product and workflow definition
- Project and delivery management
- Frontend and backend engineering
- Payments and financial systems engineering
- Data engineering and integrations
- Infrastructure, security, and cloud engineering
- Quality assurance and release management
The development team was composed of a mix of Step 7 engineers and additional specialists recruited and onboarded by Step 7 to support the scale and complexity of a regulated fintech payments platform. Regardless of sourcing, all technical resources operated under Step 7’s leadership, processes, and delivery standards.
Throughout the engagement, Step 7:
- Partnered with leadership in bi-weekly executive reviews to align technical roadmap with business strategy and funding milestones
- Defined the end-to-end system, payments, and data architecture
- Authored detailed technical specifications, workflows, and acceptance criteria
- Designed and implemented Plaid and Dwolla integrations
- Planned and coordinated work across frontend, backend, payments, and infrastructure teams
- Led sprint execution, QA, and production deployments
- Provided leadership with clear visibility into progress, risks, and strategic trade-offs through executive dashboards and decision frameworks
- Owned delivery accountability from concept through production release
- Delivered technical documentation to support ongoing platform evolution
This delivery model ensured architectural consistency, security, and predictable execution across a complex fintech system handling identity verification, bank connectivity, approvals, and ACH payment workflows.
Secure Bank Connectivity & Identity Verification
To establish secure and scalable bank connections, Step 7 integrated Plaid Link, supporting Instant Auth, Instant Micro-Deposits, and Manual Micro-Deposits to maximize compatibility across financial institutions.
The platform leveraged multiple Plaid APIs to support operational, security, and risk-management requirements:
- Plaid Auth for account and routing number validation
- Plaid Balance to verify available funds at multiple stages
- Plaid Identity Verification to validate payees and reduce fraud risk
- Plaid Transactions to retrieve inbound deposits used as ACH funding sources
- Plaid Webhooks to enable event-driven workflows and scalability
Automated Funding Attribution & Human-in-the-Loop Approval
A core architectural challenge was designing a system that could automatically reconcile inbound funds with outbound ACH payments while preserving strict human oversight.
Step 7 implemented a workflow engine that:
- Automatically retrieves inbound deposits from linked bank accounts
- Determines which ACH payment(s) each deposit is intended to fund
- Assigns funding sources to transactions programmatically
- Tracks transactions through defined workflow states (pending funding, funded, pending approval, processing, completed)
- Once funding was attached, the system:
- Automatically advanced transactions to a pre-approval state
- Notified designated approvers via email when review was required
- Re-validated available balances via Plaid immediately before approval
This ensured payments could not proceed unless funds were verified at the moment of approval.
ACH Payment Orchestration & Settlement
Upon approval, the platform dynamically identified all parties entitled to payment—often six or more payees per transaction—and staged ACH transfers in the backend.
Key orchestration capabilities included:
- Batching and staging transfers in alignment with Dwolla execution windows
- Performing a final balance verification via Plaid immediately before initiating transfers
- Issuing ACH transfer requests to Dwolla only after all validations passed
- Using Dwolla webhooks, the platform tracked settlement events and automatically:
- Closed transactions
- Marked individual payments as posted
- Notified payees when funds were received
This design delivered reliability, traceability, and operational resilience across the entire ACH payment lifecycle.
Technologies
The platform was built using a modern, scalable stack tailored for fintech reliability and observability:
- Frontend: React, Next.js
- Backend: Node.js
- Infrastructure: AWS EC2 (Ubuntu), AWS S3
- Database: MySQL
- Deployment & CI/CD: GitHub Actions powering CI/CD pipelines
- Environments: Four distinct environments (Development, QA, Staging, Production) to support robust testing and release discipline
Results
- Delivered a trusted technical partnership that enabled the startup’s leadership to focus on product strategy, business development and fundraising while Step 7 owned engineering execution
- Took the platform from concept to production launch with no prior systems in place
- Successfully built and managed a team of engineers to deliver on time and on scope
- Delivered a fully operational fintech SaaS supporting real-estate ACH payments
- Eliminated manual check-based workflows and spreadsheet reconciliation
- Reduced processing time and operational overhead while improving reliability
- Established a collaborative working model between technical and business leadership that supported rapid iteration and market validation
This foundation later enabled AI-driven automation without compromising security, auditability, or human oversight.
Before & After Snapshot
Before
- Concept-only startup
- Paper checks and manual wire transfers
- Spreadsheet-based reconciliation
- Limited visibility into payment status
After
- Production-grade fintech SaaS platform
- Secure, API-driven bank connectivity
- Automated ACH workflows with approval controls
- Real-time visibility and full audit trails
- Strategic technical partnership aligned with business objectives
Why This Matters for Mid-Market Teams
Many startups and mid-market fintech teams struggle to move from idea to production while navigating payment complexity, compliance constraints, and scalability concerns.
This project demonstrates how Step 7 Consulting helps teams:
- Go from concept to launch with confidence
- Architect real-world fintech systems—not just integrations
- Recruit, manage, and lead engineering teams
- Partner with leadership to align technical execution with business strategy
- Balance automation with control, security, and auditability
- Build scalable foundations that support future innovation, including AI
The result isn’t just faster payments—it’s platforms built to last and partnerships built on trust..
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