What building bilig taught me about spreadsheet agents
A field note on why spreadsheet agents need workbook APIs, authoritative readback, rendered proof, undo, and real workbook corpus tests instead of screenshot-driven automation.
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Software architect / fractional CTO
Greg Konush
I help AI teams turn ambitious prototypes into resilient products, production platforms, and calmer engineering systems.
Startup pace with enterprise scar tissue: Flexport, Okta, Illumio, Truewind, cloud platforms, agent workflows, and product loops that measure what matters.
Operating lanes
Ambitious systems, practical operating discipline.
The work is grounded in production systems, measurable product outcomes, and leadership habits that survive messy execution.
Platform modernization
Turn brittle stacks into observable cloud platforms with fewer moving parts and clearer ownership.
Flexport: 25% infra cost reduction and p99 latency from 20s to 500ms.
AI workflow architecture
Ship AI features with audit trails, human review, reliable data paths, and product feedback loops.
Truewind: critical automation modules for accounting workflows and Series A readiness.
Founder operating rhythm
Translate ambition into weekly shipping cadence, technical direction, and pragmatic team rituals.
Hands-on architecture, implementation, hiring signal, and delivery pressure.
Proof
Built across logistics, security, finance, and agents.
The throughline is not a stack. It is turning ambiguous product pressure into systems people can trust.
Marketplace systems
Led Flexport launches across Deliverr integration, multimodal freight, and FTL marketplace coverage.
Security at scale
Built vulnerability analysis at Okta and zero-trust segmentation products at Illumio.
Agentic products
Design AI systems around readback, proof, rollback, and real user operations instead of demos.
Field notes
Writing from the edge of the work.
Notes on AI systems, infrastructure, runtimes, and the product instincts behind reliable engineering.
Why the Temporal Bun SDK uses Bun and protobufs directly
Why the Temporal Bun SDK moved away from the old Zig bridge experiment and toward Bun, generated Temporal protobufs, replay evidence, and production gates.
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Temporal Bun SDK reaches 0.10.0
A current look at @proompteng/temporal-bun-sdk 0.10.0, its Bun-native worker runtime, replay gates, load evidence, and production-readiness checks.
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Vercel AI SDK with Next.js
Shipping real-time AI flows in Next.js while keeping latency low, UI snappy, and observability first-class.
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Build log
Current systems in the workshop.
A compact view of the active projects, SDKs, agent tools, and operating systems that shape the work.
Temporal Bun SDK
Bun-native Temporal worker/client runtime with protobufs, replay evidence, and production readiness gates.
bilig
Spreadsheet agent workbench built around workbook APIs, authoritative readback, rendered proof, and undo.
proompteng
Kubernetes control plane for AI agents and agent workloads.
Experimentation Lab
Research systems across runtimes, infrastructure, trading, and agents.
Milkshake
Clipboard-first image generation CLI for fast visual loops.
MLX Dev Agent
Local-first agent experiments optimized for Apple silicon.
Editor
Neovim with AstroNvim, Codex, and Claude Code.
Stack
TypeScript, Go, Kubernetes, Python, Next.js, PostgreSQL.
Workflow
Shape Up for direction, focused sessions for delivery.
Flight log
Work
Aug 2024 - PresentTruewind
Founding Software Engineer
Jul 2021 - Jul 2024Flexport
Staff Software Engineer
Jul 2019 - Jul 2021Illumio
Senior Software Engineer
Aug 2018 - Jul 2019Okta
Senior Software Engineer
Sep 2017 - Aug 2018Eventbrite
Software Engineer
Mar 2017 - Sep 2017Ticketfly
Software Engineer
Sep 2015 - Mar 2017Narvar
Software Development Engineer in Test