How 1 Developer Launched Nationwide Payroll in 3 Weeks
Rollfi helped TaaSPak’s lone developer ship fully embedded payroll in under three weeks, after years of frustration with legacy and “API-lite” providers. The result: ERPsy, TaaSPak’s construction-focused ERP, now offers truly integrated, multi-state payroll as a core feature instead of a bolted-on afterthought.
Customer and product overview
TaaSPak is a technology-as-a-service company building ERPsy, an ERP platform for small construction businesses and subcontractors that have outgrown QuickBooks or struggle with stitching together multiple tools for time tracking, job management, dispatch, contracts, CRM, and accounting. ERPsy’s mission is to bring “enterprise-grade” capabilities to small businesses in a way that is easy to use and fully unified, so customers no longer bounce between systems just to run their day-to-day operations.
Developer profile and constraints
ERPsy is effectively a one-developer product: Zach Harris, Chief Development Officer, has written nearly all of the platform’s code, supported only by a junior developer and occasional short-term help over the years. With a small team and a growing feature surface area, Zach’s development philosophy is simple: avoid rebuilding commodity components, lean heavily on templates and AI, and reserve energy for core product value.
Previous payroll attempts and pain
Before Rollfi, TaaSPak tried multiple payroll paths and ran into consistent developer and product friction. Key experiences included:
Building their own accounting layer while initially planning to integrate with QuickBooks, only to run into the usual integration maintenance and data-model mismatch headaches.
Running a Paylocity integration in production for well over a year, where the sheer volume of required fields and configuration created unnecessary complexity for their sub‑15-employee customers and burdened TaaSPak’s small team.
Discovering that Paylocity’s front end allowed HR admins to overwrite time and hours, with no reliable way for ERPsy to reconcile changes through webhooks or update endpoints, leaving systems out of sync and support-heavy.
Evaluating developer-focused vendors like Check HQ and Gusto’s embedded payroll, but getting little or no follow-up, which made Zach question their reliability as long-term partners for such a critical workflow.
On top of these technical issues, Zach was deeply concerned about the responsibility of handling money movement and tax compliance himself, especially across multiple states, and knew payroll was not something he wanted to own in-house.
Why Rollfi was chosen
When it was time to find a new solution, Zach went back to first principles: he needed an API-first, developer-centric payroll platform that could disappear into ERPsy while handling the complexity of multi-state tax and compliance. Several factors led him to choose Rollfi:
API-first, developer-native design: Unlike traditional payroll systems that added APIs as an afterthought to support distribution partnerships, Rollfi’s product and documentation were clearly structured around developers as primary users, not secondary integrators.
Clear, comprehensive API reference: The API documentation was organized around the actual payroll lifecycle, starting with company onboarding, which matched how Zach likes to build: begin at step one and move forward sequentially.
Responsiveness and support: From the first email, Rollfi’s team responded quickly and stayed engaged, including a shared Slack channel where highly knowledgeable team members could troubleshoot errors and edge cases in near real time.
Nationwide coverage and compliance: Rollfi’s ability to run payroll in any U.S. state and handle all federal and state filings (941s, quarterly reports, annual filings, W‑2s, and tax calculations) meant ERPsy could launch nationally instead of being constrained to Georgia.
The responsiveness and the way that you guys got engaged quickly with us sold me from the first day that I sent an email to you guys. - Zach Harris
In Zach’s words through the interview, Rollfi’s responsiveness and focus on developers stood out in stark contrast to his experience with legacy vendors and silent “embedded” competitors.
Fast, single-developer integration
Once Zach decided to move forward, ERPsy’s Rollfi-powered payroll went live in less than three weeks with essentially a single developer driving the implementation. Several factors enabled that timeline:
Pragmatic front-end strategy: Zach relies on a purchased Bootstrap template for the ERPsy UI, so he does not waste time rebuilding generic interface components.
Heavy AI usage: TaaSPak has used AI from “day one,” allowing Zach to quickly generate boilerplate, transform data structures, and accelerate back-end integration work.
Field-for-field data modeling: Rather than trying to minimize fields and “work around” the API, Zach replicated Rollfi’s data model inside ERPsy, turning ERPsy into the system of record for all employee and company data outside of sensitive bank details.
Starting at onboarding: Following the API docs, he began with company onboarding—the first real step in the payroll lifecycle—then proceeded step by step, instead of prematurely building reports or ancillary flows.
Even coming from a Paylocity integration, Zach describes the Rollfi integration as straightforward: map ERPsy’s data to Rollfi’s schema, wire up the endpoints, and lean on Rollfi’s support to resolve the few issues that surfaced during production hardening.
Improved developer experience
For a one-dev team, the difference between Paylocity and Rollfi was stark.
Data complexity vs. practicality: Paylocity exposed a far larger set of fields and options than ERPsy’s customers would ever use, forcing Zach to carry unnecessary complexity through his product and onboarding flows. Rollfi supports sophisticated scenarios but does not require small clients to manage 17 fields just to send hours for a time entry.
Data ownership and sync: With Paylocity, admins could change hours directly in their portal, leaving ERPsy out of sync, with no reliable callback or change-tracking method to reconcile records. With Rollfi, ERPsy acts as the “Bible” and system of record for most data, minimizing drift and making it obvious which system is correct if discrepancies arise.
Error resolution and iteration: Issues with Paylocity’s batch changes and error handling forced Zach to implement more support functions than he felt were necessary. Rollfi’s support model—fast Slack responses, knowledgeable staff, and clear error investigation—shortened the debug loop and kept integration momentum high.
For Zach, that translated directly into less ongoing maintenance, fewer customer support headaches, and more time to focus on ERPsy’s core features.
Building ERPsy into a one-stop shop
With Rollfi embedded, ERPsy can now credibly promise small construction businesses that they can run their entire operation—from time tracking and job costing to payments and payroll—in one system. Customers no longer need to track time in ERPsy, export hours, manually re-enter them into a third-party payroll system, and then struggle to reconcile job costs across platforms.
Rollfi also unlocked TaaSPak’s original go-to-market ambition: instead of launching only in Georgia, ERPsy can serve customers in any state from day one, because Rollfi abstracts away state-specific payroll and tax rules. That capability, combined with Priority’s merchant services and payment processing (also being integrated into ERPsy), rounds out ERPsy’s value as a modern, integrated back office for contractors.
Advice to future partners
Zach’s guidance for other developers embedding Rollfi into their platforms is straightforward and rooted in his recent experience:
Start with onboarding: Begin at the first step of the real-world payroll journey—employer onboarding—and implement the API in the same order a customer would experience it.
Make your app the system of record: Capture and store every feasible field in your own data model (names, addresses, employee details, etc.) so your platform remains the source of truth, while delegating sensitive items like bank account linking to Rollfi.
Don’t overcomplicate the schema: Instead of trying to avoid fields, map everything up front; it is faster long term than revisiting the integration six months later when you suddenly need a field you skipped.
Lean on support: Use the shared Slack channel and Rollfi’s team whenever something is unclear—fast, expert responses shorten your integration timeline and reduce guesswork.
For TaaSPak, that approach yielded a live, fully embedded payroll offering in under three weeks from a single developer, transforming payroll from an intimidating risk into a competitive advantage inside ERPsy
About Rollfi
Rollfi empowers banks, vertical SaaS platforms, accounting firms, and fintechs to add payroll and benefits to their offerings through white-label solutions and robust APIs. With Rollfi’s infrastructure, platforms can unlock new revenue, boost customer retention, and gain valuable payroll data insights. Fast deployment and full regulatory coverage make Rollfi the easiest way to turn your platform into a one-stop shop for essential business services.
Rollfi helped TaaSPak’s lone developer ship fully embedded payroll in under three weeks, after years of frustration with legacy and “API-lite” providers. The result: ERPsy, TaaSPak’s construction-focused ERP, now offers truly integrated, multi-state payroll as a core feature instead of a bolted-on afterthought.
Customer and product overview
TaaSPak is a technology-as-a-service company building ERPsy, an ERP platform for small construction businesses and subcontractors that have outgrown QuickBooks or struggle with stitching together multiple tools for time tracking, job management, dispatch, contracts, CRM, and accounting. ERPsy’s mission is to bring “enterprise-grade” capabilities to small businesses in a way that is easy to use and fully unified, so customers no longer bounce between systems just to run their day-to-day operations.
Developer profile and constraints
ERPsy is effectively a one-developer product: Zach Harris, Chief Development Officer, has written nearly all of the platform’s code, supported only by a junior developer and occasional short-term help over the years. With a small team and a growing feature surface area, Zach’s development philosophy is simple: avoid rebuilding commodity components, lean heavily on templates and AI, and reserve energy for core product value.
Previous payroll attempts and pain
Before Rollfi, TaaSPak tried multiple payroll paths and ran into consistent developer and product friction. Key experiences included:
Building their own accounting layer while initially planning to integrate with QuickBooks, only to run into the usual integration maintenance and data-model mismatch headaches.
Running a Paylocity integration in production for well over a year, where the sheer volume of required fields and configuration created unnecessary complexity for their sub‑15-employee customers and burdened TaaSPak’s small team.
Discovering that Paylocity’s front end allowed HR admins to overwrite time and hours, with no reliable way for ERPsy to reconcile changes through webhooks or update endpoints, leaving systems out of sync and support-heavy.
Evaluating developer-focused vendors like Check HQ and Gusto’s embedded payroll, but getting little or no follow-up, which made Zach question their reliability as long-term partners for such a critical workflow.
On top of these technical issues, Zach was deeply concerned about the responsibility of handling money movement and tax compliance himself, especially across multiple states, and knew payroll was not something he wanted to own in-house.
Why Rollfi was chosen
When it was time to find a new solution, Zach went back to first principles: he needed an API-first, developer-centric payroll platform that could disappear into ERPsy while handling the complexity of multi-state tax and compliance. Several factors led him to choose Rollfi:
API-first, developer-native design: Unlike traditional payroll systems that added APIs as an afterthought to support distribution partnerships, Rollfi’s product and documentation were clearly structured around developers as primary users, not secondary integrators.
Clear, comprehensive API reference: The API documentation was organized around the actual payroll lifecycle, starting with company onboarding, which matched how Zach likes to build: begin at step one and move forward sequentially.
Responsiveness and support: From the first email, Rollfi’s team responded quickly and stayed engaged, including a shared Slack channel where highly knowledgeable team members could troubleshoot errors and edge cases in near real time.
Nationwide coverage and compliance: Rollfi’s ability to run payroll in any U.S. state and handle all federal and state filings (941s, quarterly reports, annual filings, W‑2s, and tax calculations) meant ERPsy could launch nationally instead of being constrained to Georgia.
The responsiveness and the way that you guys got engaged quickly with us sold me from the first day that I sent an email to you guys. - Zach Harris
In Zach’s words through the interview, Rollfi’s responsiveness and focus on developers stood out in stark contrast to his experience with legacy vendors and silent “embedded” competitors.
Fast, single-developer integration
Once Zach decided to move forward, ERPsy’s Rollfi-powered payroll went live in less than three weeks with essentially a single developer driving the implementation. Several factors enabled that timeline:
Pragmatic front-end strategy: Zach relies on a purchased Bootstrap template for the ERPsy UI, so he does not waste time rebuilding generic interface components.
Heavy AI usage: TaaSPak has used AI from “day one,” allowing Zach to quickly generate boilerplate, transform data structures, and accelerate back-end integration work.
Field-for-field data modeling: Rather than trying to minimize fields and “work around” the API, Zach replicated Rollfi’s data model inside ERPsy, turning ERPsy into the system of record for all employee and company data outside of sensitive bank details.
Starting at onboarding: Following the API docs, he began with company onboarding—the first real step in the payroll lifecycle—then proceeded step by step, instead of prematurely building reports or ancillary flows.
Even coming from a Paylocity integration, Zach describes the Rollfi integration as straightforward: map ERPsy’s data to Rollfi’s schema, wire up the endpoints, and lean on Rollfi’s support to resolve the few issues that surfaced during production hardening.
Improved developer experience
For a one-dev team, the difference between Paylocity and Rollfi was stark.
Data complexity vs. practicality: Paylocity exposed a far larger set of fields and options than ERPsy’s customers would ever use, forcing Zach to carry unnecessary complexity through his product and onboarding flows. Rollfi supports sophisticated scenarios but does not require small clients to manage 17 fields just to send hours for a time entry.
Data ownership and sync: With Paylocity, admins could change hours directly in their portal, leaving ERPsy out of sync, with no reliable callback or change-tracking method to reconcile records. With Rollfi, ERPsy acts as the “Bible” and system of record for most data, minimizing drift and making it obvious which system is correct if discrepancies arise.
Error resolution and iteration: Issues with Paylocity’s batch changes and error handling forced Zach to implement more support functions than he felt were necessary. Rollfi’s support model—fast Slack responses, knowledgeable staff, and clear error investigation—shortened the debug loop and kept integration momentum high.
For Zach, that translated directly into less ongoing maintenance, fewer customer support headaches, and more time to focus on ERPsy’s core features.
Building ERPsy into a one-stop shop
With Rollfi embedded, ERPsy can now credibly promise small construction businesses that they can run their entire operation—from time tracking and job costing to payments and payroll—in one system. Customers no longer need to track time in ERPsy, export hours, manually re-enter them into a third-party payroll system, and then struggle to reconcile job costs across platforms.
Rollfi also unlocked TaaSPak’s original go-to-market ambition: instead of launching only in Georgia, ERPsy can serve customers in any state from day one, because Rollfi abstracts away state-specific payroll and tax rules. That capability, combined with Priority’s merchant services and payment processing (also being integrated into ERPsy), rounds out ERPsy’s value as a modern, integrated back office for contractors.
Advice to future partners
Zach’s guidance for other developers embedding Rollfi into their platforms is straightforward and rooted in his recent experience:
Start with onboarding: Begin at the first step of the real-world payroll journey—employer onboarding—and implement the API in the same order a customer would experience it.
Make your app the system of record: Capture and store every feasible field in your own data model (names, addresses, employee details, etc.) so your platform remains the source of truth, while delegating sensitive items like bank account linking to Rollfi.
Don’t overcomplicate the schema: Instead of trying to avoid fields, map everything up front; it is faster long term than revisiting the integration six months later when you suddenly need a field you skipped.
Lean on support: Use the shared Slack channel and Rollfi’s team whenever something is unclear—fast, expert responses shorten your integration timeline and reduce guesswork.
For TaaSPak, that approach yielded a live, fully embedded payroll offering in under three weeks from a single developer, transforming payroll from an intimidating risk into a competitive advantage inside ERPsy
About Rollfi
Rollfi empowers banks, vertical SaaS platforms, accounting firms, and fintechs to add payroll and benefits to their offerings through white-label solutions and robust APIs. With Rollfi’s infrastructure, platforms can unlock new revenue, boost customer retention, and gain valuable payroll data insights. Fast deployment and full regulatory coverage make Rollfi the easiest way to turn your platform into a one-stop shop for essential business services.
Rollfi helped TaaSPak’s lone developer ship fully embedded payroll in under three weeks, after years of frustration with legacy and “API-lite” providers. The result: ERPsy, TaaSPak’s construction-focused ERP, now offers truly integrated, multi-state payroll as a core feature instead of a bolted-on afterthought.
Customer and product overview
TaaSPak is a technology-as-a-service company building ERPsy, an ERP platform for small construction businesses and subcontractors that have outgrown QuickBooks or struggle with stitching together multiple tools for time tracking, job management, dispatch, contracts, CRM, and accounting. ERPsy’s mission is to bring “enterprise-grade” capabilities to small businesses in a way that is easy to use and fully unified, so customers no longer bounce between systems just to run their day-to-day operations.
Developer profile and constraints
ERPsy is effectively a one-developer product: Zach Harris, Chief Development Officer, has written nearly all of the platform’s code, supported only by a junior developer and occasional short-term help over the years. With a small team and a growing feature surface area, Zach’s development philosophy is simple: avoid rebuilding commodity components, lean heavily on templates and AI, and reserve energy for core product value.
Previous payroll attempts and pain
Before Rollfi, TaaSPak tried multiple payroll paths and ran into consistent developer and product friction. Key experiences included:
Building their own accounting layer while initially planning to integrate with QuickBooks, only to run into the usual integration maintenance and data-model mismatch headaches.
Running a Paylocity integration in production for well over a year, where the sheer volume of required fields and configuration created unnecessary complexity for their sub‑15-employee customers and burdened TaaSPak’s small team.
Discovering that Paylocity’s front end allowed HR admins to overwrite time and hours, with no reliable way for ERPsy to reconcile changes through webhooks or update endpoints, leaving systems out of sync and support-heavy.
Evaluating developer-focused vendors like Check HQ and Gusto’s embedded payroll, but getting little or no follow-up, which made Zach question their reliability as long-term partners for such a critical workflow.
On top of these technical issues, Zach was deeply concerned about the responsibility of handling money movement and tax compliance himself, especially across multiple states, and knew payroll was not something he wanted to own in-house.
Why Rollfi was chosen
When it was time to find a new solution, Zach went back to first principles: he needed an API-first, developer-centric payroll platform that could disappear into ERPsy while handling the complexity of multi-state tax and compliance. Several factors led him to choose Rollfi:
API-first, developer-native design: Unlike traditional payroll systems that added APIs as an afterthought to support distribution partnerships, Rollfi’s product and documentation were clearly structured around developers as primary users, not secondary integrators.
Clear, comprehensive API reference: The API documentation was organized around the actual payroll lifecycle, starting with company onboarding, which matched how Zach likes to build: begin at step one and move forward sequentially.
Responsiveness and support: From the first email, Rollfi’s team responded quickly and stayed engaged, including a shared Slack channel where highly knowledgeable team members could troubleshoot errors and edge cases in near real time.
Nationwide coverage and compliance: Rollfi’s ability to run payroll in any U.S. state and handle all federal and state filings (941s, quarterly reports, annual filings, W‑2s, and tax calculations) meant ERPsy could launch nationally instead of being constrained to Georgia.
The responsiveness and the way that you guys got engaged quickly with us sold me from the first day that I sent an email to you guys. - Zach Harris
In Zach’s words through the interview, Rollfi’s responsiveness and focus on developers stood out in stark contrast to his experience with legacy vendors and silent “embedded” competitors.
Fast, single-developer integration
Once Zach decided to move forward, ERPsy’s Rollfi-powered payroll went live in less than three weeks with essentially a single developer driving the implementation. Several factors enabled that timeline:
Pragmatic front-end strategy: Zach relies on a purchased Bootstrap template for the ERPsy UI, so he does not waste time rebuilding generic interface components.
Heavy AI usage: TaaSPak has used AI from “day one,” allowing Zach to quickly generate boilerplate, transform data structures, and accelerate back-end integration work.
Field-for-field data modeling: Rather than trying to minimize fields and “work around” the API, Zach replicated Rollfi’s data model inside ERPsy, turning ERPsy into the system of record for all employee and company data outside of sensitive bank details.
Starting at onboarding: Following the API docs, he began with company onboarding—the first real step in the payroll lifecycle—then proceeded step by step, instead of prematurely building reports or ancillary flows.
Even coming from a Paylocity integration, Zach describes the Rollfi integration as straightforward: map ERPsy’s data to Rollfi’s schema, wire up the endpoints, and lean on Rollfi’s support to resolve the few issues that surfaced during production hardening.
Improved developer experience
For a one-dev team, the difference between Paylocity and Rollfi was stark.
Data complexity vs. practicality: Paylocity exposed a far larger set of fields and options than ERPsy’s customers would ever use, forcing Zach to carry unnecessary complexity through his product and onboarding flows. Rollfi supports sophisticated scenarios but does not require small clients to manage 17 fields just to send hours for a time entry.
Data ownership and sync: With Paylocity, admins could change hours directly in their portal, leaving ERPsy out of sync, with no reliable callback or change-tracking method to reconcile records. With Rollfi, ERPsy acts as the “Bible” and system of record for most data, minimizing drift and making it obvious which system is correct if discrepancies arise.
Error resolution and iteration: Issues with Paylocity’s batch changes and error handling forced Zach to implement more support functions than he felt were necessary. Rollfi’s support model—fast Slack responses, knowledgeable staff, and clear error investigation—shortened the debug loop and kept integration momentum high.
For Zach, that translated directly into less ongoing maintenance, fewer customer support headaches, and more time to focus on ERPsy’s core features.
Building ERPsy into a one-stop shop
With Rollfi embedded, ERPsy can now credibly promise small construction businesses that they can run their entire operation—from time tracking and job costing to payments and payroll—in one system. Customers no longer need to track time in ERPsy, export hours, manually re-enter them into a third-party payroll system, and then struggle to reconcile job costs across platforms.
Rollfi also unlocked TaaSPak’s original go-to-market ambition: instead of launching only in Georgia, ERPsy can serve customers in any state from day one, because Rollfi abstracts away state-specific payroll and tax rules. That capability, combined with Priority’s merchant services and payment processing (also being integrated into ERPsy), rounds out ERPsy’s value as a modern, integrated back office for contractors.
Advice to future partners
Zach’s guidance for other developers embedding Rollfi into their platforms is straightforward and rooted in his recent experience:
Start with onboarding: Begin at the first step of the real-world payroll journey—employer onboarding—and implement the API in the same order a customer would experience it.
Make your app the system of record: Capture and store every feasible field in your own data model (names, addresses, employee details, etc.) so your platform remains the source of truth, while delegating sensitive items like bank account linking to Rollfi.
Don’t overcomplicate the schema: Instead of trying to avoid fields, map everything up front; it is faster long term than revisiting the integration six months later when you suddenly need a field you skipped.
Lean on support: Use the shared Slack channel and Rollfi’s team whenever something is unclear—fast, expert responses shorten your integration timeline and reduce guesswork.
For TaaSPak, that approach yielded a live, fully embedded payroll offering in under three weeks from a single developer, transforming payroll from an intimidating risk into a competitive advantage inside ERPsy
About Rollfi
Rollfi empowers banks, vertical SaaS platforms, accounting firms, and fintechs to add payroll and benefits to their offerings through white-label solutions and robust APIs. With Rollfi’s infrastructure, platforms can unlock new revenue, boost customer retention, and gain valuable payroll data insights. Fast deployment and full regulatory coverage make Rollfi the easiest way to turn your platform into a one-stop shop for essential business services.