Software for processes your business has outgrown.

I help established B2B companies replace time-consuming manual work, connect systems that do not talk to each other, and build internal tools when available software cannot do the job.

I start by looking for the simplest workable answer. Sometimes that means changing a process or making better use of software you already own. When custom development is the right answer, I build it and leave your company in control of it.

Request a fit call Email David directly

Signs that a process needs a closer look.

Employees enter the same information in several systems or spend hours reconciling records.
A spreadsheet maintained by one person has become essential to the business.
People cannot see the status of an order, job, or customer without asking around.
A recurring process depends on rules that only a few experienced employees know.

I usually work with owners, operations leaders, and IT or business-systems managers at established B2B companies without their own software development team. I work first in the Charlotte area and take on remote projects elsewhere in the United States when they are a good match. Delivery starts at $15,000; current phases typically fall between $25,000 and $75,000.

Tell me what is slowing the business down

Founder-built work

Groundwave is a live product that I designed, built, and still run. It is the clearest public example of my product and engineering work.

Live product · Built and operated by Whisker Tech’s founder

Groundwave

One system for public discovery and the recurring work of amateur-radio clubs.

Amateur-radio clubs often manage members, dues, events, messages, documents, and public information in separate places. Groundwave brings that work into a shared workspace while also helping the public find clubs and repeaters. I designed, built, deployed, and continue to operate the product through Whisker Tech.

Groundwave also keeps nationwide FCC records current without overwriting information created by users and clubs. Because I run the product myself, I deal with the consequences of design and engineering decisions after they reach production.

My responsibility: Product, user experience, software, and operations
Work supported: Public discovery and permission-based club administration
Data operations: Updates, reconciliation, and full reconstruction of imported records
Product operations: Subscriptions, deployment, and ongoing support

Read the Groundwave case study Visit groundwavehq.com

Additional technical background

Other work

Ingot

An open-source embedded database for Go applications, with public tests and design notes covering recovery, operating limits, and damaged writes.

Review the technical note View the public source

AlphaFoundry

A quantitative research application I built for my own use. My market-data licenses prevent me from publishing the application or its output.

Read the project note

What I can help with

Most projects start with a process that takes too long, loses information, or relies on people to bridge gaps between systems.

Replace a manual workflow

Move recurring work out of spreadsheets, inboxes, and checklists. This can include data entry, reports, document routing, approvals, and routine handoffs.

Connect existing systems

Pass approved information between ERP, CRM, accounting, vendor, and other business systems without asking employees to copy it by hand.

Build an internal tool

Give employees one place to apply your rules, handle exceptions, and find the information they need when packaged software leaves a gap.

Assessments cost $5,000–$10,000. Delivery has a $15,000 minimum, and current phases typically fall between $25,000 and $75,000.

Discuss whether the problem fits

Current focus area

Manufacturing

Software for work the ERP does not handle.

Manufacturing is where I am concentrating my business development now. I am especially interested in planning, reporting, integration, and exception work that still happens outside the ERP. This is a current focus, not a claim that I am an ERP implementer or a long-established manufacturing specialist.

Explore software for manufacturing operations

Working relationship

How I work with clients

You work with me: I learn the process, make the recommendation, and build the software. I do not hand work to subcontractors.
You see the work: We review working software, open questions, and risks at agreed points during the project.
You control the accounts: Your company controls the source repository, infrastructure, and vendor accounts where practical.
You receive documentation: I document deployment, routine operation, recovery, and the decisions another developer would need to understand.
Defects are covered: Delivery includes 30 days to correct defects in the agreed work. Ongoing maintenance is available under a separate agreement.

Review an illustrative delivery plan

I’m David Rinaldo.

Before starting Whisker Tech, I spent seven years in software engineering and engineering leadership roles building backend, cloud, and data systems. I left corporate engineering in 2024 to work directly with businesses that need better internal software.

Red Ventures 3.5 years: Software engineer responsible for AWS accounts and the infrastructure configured within them.
Gannett / USA Today 2 years: Senior engineer and engineering manager on teams operating high-volume cloud systems.
RVO Health 1.5 years: Engineering manager and associate director for the data platform team responsible for large-scale ingestion and machine-learning pipelines used for analytics and decision-making.

That background taught me to treat reliability, access, deployment, and documentation as part of the work rather than cleanup after the code is written.

Clients deal directly with me, and I do not use subcontractors. I work with operations leaders who have no internal developer and with IT or business-systems managers who need someone to own delivery.

View my public code on GitHub See my KZ4LA record on Groundwave

Charlotte first · Strong-fit remote US work

What is slowing the business down?

Tell me what is taking too much time, where information gets lost, or which workaround has become hard to live with. I will reply within one business day and let you know whether I think a conversation would be useful.

Email me about the problem

Or write directly to contact@whiskertech.dev.

Current engagement ranges

Assessment: $5,000–$10,000 when the right solution or scope is unclear
Delivery minimum: $15,000
Current delivery range: $25,000–$75,000 for a defined phase

Final pricing depends on the work. If you are unsure which range applies, say so in your note.

What happens next

I read your note and confirm whether the problem is in my area.
If it is, we have a no-cost 30-minute call about the process, systems, and cost of the problem.
After the call, I tell you what I recommend. That may be an assessment, a delivery proposal, or no further work.

Vendor requirements

If your company has vendor, insurance, NDA, or security-review requirements, raise them during the first conversation so I can confirm what the engagement requires.

Fit conversation

Describe the operating problem

Only three fields required

01Name

02Email

03Operating problem

What is happening today, who it affects, and what the business needs to do more reliably.

Add useful business context Optional

Share what you already know. These details help me give you a more useful first response.

04Company

05Your role

06Current process and systems

How the work moves today, including spreadsheets, software, manual steps, and handoffs. Do not include confidential details.

07Why now and timing

08Budget context