polycratia

Senior full-stack engineer, no agency layer. I design, ship, and run payments, crypto rails, marketplaces, and LLM pipelines. Ten years in production; crypto since 2018.

Istanbul (UTC+3) Joined on Jul 30, 2026 https://polycratia.com/r/mdv

Work

Independent engineer — polycratia.com

polycratia

Sep 5

A ledger should not own a money type

#python #fintech #crypto #architecture

6 min read

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polycratia

Sep 4

Fee estimation belongs inside the coin selection loop

#python #fintech #crypto #architecture

7 min read

polycratia

Sep 3

Exactly-once deposits: a broker cannot deduplicate a reorg

#python #fintech #crypto #architecture

6 min read

polycratia

Sep 2

A deposit is confirmed by the tip, not by first sight

#python #fintech #crypto #architecture

6 min read

polycratia

Sep 1

Coin selection should return a reason, not None

#python #fintech #crypto #architecture

6 min read

polycratia

Aug 31

A balance is a query, and a hold is not a column

#python #fintech #crypto #architecture

8 min read

polycratia

Aug 30

Declare once, apply to many: scoping VEX decisions without lying

#python #fintech #crypto #architecture

7 min read

polycratia

Aug 28

Multi-carrier shipping rates are quotes, not prices

#python #fintech #crypto #architecture

5 min read

polycratia

Aug 25

Custodial ETH withdrawals: the nonce is a database row, not a node call

#python #fintech #crypto #architecture

7 min read

polycratia

Aug 24

The only safe failure state for an outbound payout is unknown

#python #fintech #crypto #architecture

6 min read

polycratia

Aug 21

Splitting a loan repayment across investors without losing a cent

#python #fintech #crypto #architecture

6 min read

polycratia

Aug 19

Treat LLM Catalog Translation as a Cache, Not a Job

#python #fintech #crypto #architecture

6 min read

polycratia

Aug 18

KYC webhooks arrive out of order, so rank the decisions

#python #fintech #crypto #architecture

5 min read

polycratia

Aug 17

Crediting On-Chain Deposits Without a Balance Column

#python #fintech #crypto #architecture

6 min read

polycratia

Aug 16

Matching Incoming Bank Transfers to Users When the Reference Is Wrong

#python #fintech #crypto #architecture

7 min read

polycratia

Jul 30

Translating a product catalog with an LLM: cache keys and guard rails

#python #fintech #crypto #architecture

5 min read

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polycratia

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A ledger should not own a money type

Want to connect with polycratia?

Fee estimation belongs inside the coin selection loop

Exactly-once deposits: a broker cannot deduplicate a reorg

A deposit is confirmed by the tip, not by first sight

Coin selection should return a reason, not None

A balance is a query, and a hold is not a column

Declare once, apply to many: scoping VEX decisions without lying

Multi-carrier shipping rates are quotes, not prices

Custodial ETH withdrawals: the nonce is a database row, not a node call

The only safe failure state for an outbound payout is unknown

Splitting a loan repayment across investors without losing a cent

Treat LLM Catalog Translation as a Cache, Not a Job

KYC webhooks arrive out of order, so rank the decisions

Crediting On-Chain Deposits Without a Balance Column

Matching Incoming Bank Transfers to Users When the Reference Is Wrong

Translating a product catalog with an LLM: cache keys and guard rails