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Sheet 01 · Chad Koslovsky

Product engineering, from interface to operation

Senior Software Engineer · DHI Group

I enjoy making the handoffs inside a product work for the people using it. My client work connects interfaces with business rules, identity and operations, from reseller software to document signing. Years of supporting production systems keep me involved after the feature is built.

Sheet 02

Cover letter

I call myself a technomancer: technology has felt like magic since I was a kid. ClearanceJobs interests me because that magic can help someone find their next opportunity, through software that keeps the search, conversation and follow-through connected.

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Hi DHI and ClearanceJobs team,

I call myself a technomancer. Technology has felt like magic to me since I was a kid, and I still love the moment when something complicated becomes useful to someone else. That is what draws me to ClearanceJobs: behind a search result or a message is a person trying to find their next opportunity, and another person trying to build a team.

Your Senior Software Engineer opening interests me because the work follows those people through the whole product. Helping a recruiter find someone is only the beginning; the forms, identity checks, conversations and follow-through have to work together. I enjoy understanding those handoffs, building the application around them and staying responsible when it is time to put the software into use.

NuPrice was a long-term client engagement from 2019 to 2021, beginning while I was still at Front Range Internet. I built and operated the reseller application, connecting marketplace and competitor data with user-defined pricing rules, accounts, subscriptions, billing and embedded support. Supporting the customers as well as the software meant a problem could start with a question about the interface and lead all the way into the data or operations behind it. That sustained responsibility is a part of product engineering I would bring to your team.

ProofMark is another useful example. My completed client contribution was the design of a document-signing workflow across identity, PDF fields, recipient routing, verification and audit history. The work joined UI, APIs and data, with explicit handling of security-sensitive state and fallback paths. It taught me to pay attention to what people need to understand at each step, as well as what the system needs to preserve underneath. I would bring that care to ClearanceJobs' recruiter workflows and identity integrations.

I also enjoy the architecture behind an interface. I am building Kerf, an early-development TypeScript/TSX framework with its own compiler, alongside its UI toolkit and a routing, authentication and data layer. The work brings together component design, explicit update behavior and compiler feedback that coding agents can act on. It is an independent framework, informed by my longstanding React work. I use AI heavily in engineering and creative work, and building the tooling around it keeps me thinking about how to make mistakes visible and keep the engineer responsible for the result.

That application work rests on an operational background. Through Technomancy IT, I build and operate client products and tenant-aware services, including OAuth/OIDC flows and access-controlled integrations. Earlier, I ran Front Range Internet's NOC, handled production escalations and migrated workloads from Hyper-V and VMware ESXi into Docker and Kubernetes. At Office Evolution, I built shared applications connecting CRM, onboarding, provisioning and service operations across departments and locations. Those experiences keep me attentive to both the person using a system and the people maintaining it.

TypeScript and React are central to my recent application work. I have also worked with Vue and PHP, although Laravel and PHP 8 would be a ramp-up rather than a claim of current hands-on depth. I would approach your established codebases by learning their conventions, asking useful questions and delivering changes the team can review and support. The small, experienced team and practical delivery culture described in your posting appeal to me; I like being able to discuss a decision honestly, learn from the people around me and then get the work done together.

I am based in Milliken, Colorado, and would welcome a conversation about the recruiter experience your team most wants to improve. Helping people make a meaningful connection is a good use of the kind of magic I have always wanted to build.

Chad

Sheet 03

Experience

Technomancy IT LLC · Current practice

Founder / Product Engineer / Systems Lead

Build and operate client products from initial need through application, data, deployment and support.

Implement OAuth/OIDC and tenant-aware access policy across shared services and authenticated integrations.

Deep dive

Through Technomancy IT, I carry client work from an incomplete need into a production system, choosing and operating the application, data, infrastructure and support model. I bring in specialists when the project benefits from additional craft.

The shared services use tenant-aware identity and policy so client products and internal tools can share capabilities without losing access boundaries. My application and API work includes OAuth/OIDC, PKCE and token exchange, together with access-controlled SaaS connectors. Clients also call me directly for IT support.

NuPrice | Client engagement within Technomancy IT · 2019-2021

Product Engineering and IT (Long-Term Contract)

Built and operated a reseller application connecting marketplace data and user-defined repricing rules with accounts and subscriptions.

Owned billing, embedded support, customer support and technical operations throughout the client engagement, which began alongside FRII.

Deep dive

NuPrice was a long-term client engagement from 2019 to 2021, beginning alongside my Front Range Internet role during the move into sustained independent client work. I built and operated the full application and its technical operations.

Marketplace and competitor-data ingestion fed user-defined repricing rules and automated price decisions. The application also included monitoring, analytics, accounts, subscriptions, a CMS and embedded support. I handled billing and customer support as part of that connected product. The product was acquired. My work spanned the application and the technical operations supporting it.

Front Range Internet Inc. · 2015-2020

Senior Systems Engineer / Datacenter Architect

Ran the NOC and production escalations, with recovery verification, monitoring and engineering procedures.

Migrated workloads from Hyper-V and VMware ESXi into Docker and Kubernetes; upgraded server and firewall infrastructure and ran SOC 1/SOC 2 audits.

Deep dive

At Front Range Internet Inc., I ran the NOC, led infrastructure work and handled escalations over my 2015-2020 tenure. I was a lead engineer through a company purchase. Later, after the senior engineer above me left, I held sole systems-engineering responsibility for approximately a year, with the NOC continuing first-line coverage and escalating unresolved issues.

I migrated workloads from Hyper-V and VMware ESXi into Docker and Kubernetes and upgraded server and firewall infrastructure. Terraform supported repeatable infrastructure work. I also owned recovery verification, monitoring and engineering procedures, ran the SOC 1 and SOC 2 audits, and worked with the CEO and CIO. Translating technical controls into auditor-readable evidence and procedures was part of keeping the environment supportable.

Office Evolution · 2014-2015

Systems / Software Engineer

Built centralized applications connecting CRM, onboarding, provisioning and service operations across locations.

Worked with the CEO and CIO to translate cross-department handoffs into shared operational workflows.

Deep dive

Office Evolution needed shared tools across locations and departments. I built centralized applications connecting CRM, provisioning, onboarding and service operations, with MongoDB among the data tools used for its internal systems.

The work made cross-department handoffs explicit in software rather than leaving each department with an isolated view. I supported the surrounding architecture across locations and client environments and worked with the CEO and CIO. This is the practical workflow and stakeholder experience behind my later client-product work.

PlumChoice / Everon · 2012-2014

Network & Systems Engineer

Engineered and supported managed-service clients’ networks and systems, communicating directly with owners and end users.

Built diagnostic and support tooling around recurring issues and handled on-call incidents.

Deep dive

At PlumChoice / Everon, I engineered and supported networks, endpoints and broader systems across managed-service client environments. I communicated directly with business owners and end users and was also on call.

Monitoring and diagnostic work led to repeatable support tools for recurring problems. That experience informs how I investigate a production issue: understand what the person is trying to do, trace the system behind it and communicate the next step clearly.

IBM · 2010-2012

Infrastructure and Systems Focal

Supported shared enterprise infrastructure across application, infrastructure, vendor and business teams.

Automated audit and backup workflows and managed virtualization test labs and hosted desktop platforms.

Deep dive

At IBM, I was the infrastructure and systems focal for shared enterprise environments, coordinating with application, infrastructure, vendor and business teams. Access, change, incidents and escalations crossed those boundaries.

I automated audit and backup workflows and managed virtualization test labs and hosted desktop platforms. The work developed an operating perspective on application dependencies and coordinated ownership that I bring into product delivery.

Sheet 04

Selected work

Client engineering contribution · Contribution completed

ProofMark

Completed a client engineering contribution for ProofMark’s document-signing workflow, connecting identity, PDF fields, recipient routing and audit history. Across UI, APIs and data, made security-sensitive state and fallback paths explicit so signing and verification belonged to one traceable workflow.

Deep dive

ProofMark was client work, and my engineering contribution is completed. I designed a document-signing workflow across identity, PDF fields, recipient routing, audit history, verification, encryption, webhooks and embedded signing, keeping security-sensitive state and fallback paths explicit.

The work used React, Next.js, tRPC, Drizzle, PostgreSQL and Rust. The result joins the interface, APIs, data and verification surfaces in an AGPL/open-source product context. For recruiter tools, the relevant connection is making a multi-step interaction understandable while preserving identity and workflow state.

The linked public website shows ProofMark’s agreement workspace.

ProofMark website ↗

Independent framework and UI toolkit · Early development

Kerf

Building Kerf, an early-development TypeScript/TSX framework with its own compiler, alongside its UI toolkit and routing, authentication and data services. Compiler-directed page updates and actionable diagnostics connect component architecture with feedback for coding agents; the framework is independent of React.

Deep dive

Kerf is my early-development TypeScript/TSX framework with its own compiler. The work includes its UI toolkit and a full-stack layer for routing, authentication and data. I am working on the contracts between those pieces, from component behavior to the feedback a developer receives when something is wrong.

The public preview demonstrates compiler-directed page updates and actionable errors for coding agents. Those mechanisms make state and component architecture tangible: how a change reaches the page, which behavior can be reused and how an incorrect assumption gets surfaced. That is the part of frontend engineering I enjoy alongside building individual screens.

Kerf is independent of React and remains in early development. My longstanding React and TypeScript experience informs the project. The preview is linked on the card, with the npm scaffold linked separately in the resume materials.

Kerf framework preview ↗

Long-term client engagement · 2019-2021

NuPrice

For NuPrice, a long-term client engagement, built and operated a reseller application joining marketplace and competitor data with user-defined repricing rules. Connected accounts, subscriptions, billing and embedded support, then retained customer support and technical operations across the working product.

Deep dive

NuPrice was a 2019-2021 client engagement that began while I was still at Front Range Internet. I built and operated the reseller application, billing, customer support and technical operations, connecting marketplace and competitor-data ingestion to repricing rules and automated price decisions.

Accounts, subscriptions, monitoring, analytics, a CMS and embedded support were part of the application. A customer question could involve the screen, the pricing rules or the data feeding them, so my responsibility followed the workflow across those layers. That is the marketplace-product and operating experience I would bring to recruiter tools.

The product was acquired. My role was the client’s technical delivery and support; the acquisition is part of the product’s history.

Sheet 05

Capabilities

  • TypeScript · React · Vue
  • REST APIs · OAuth/OIDC
  • SQL · PostgreSQL
  • Docker · AWS · Terraform
  • CI/CD · Git