darius costolas
available for select work
senior full-stack blockchain engineer @ consensys · timișoara, romania
senior full-stack blockchain engineer with ~14 years building software and the last five deep in web3. i work across self-custody wallets, fiat payment rails, defi protocols, and secure distributed systems where backwards compatibility and reliability matter.
at consensys i build wallet and payment infrastructure across mobile, web, and shared controller libraries: fiat ramps, secure authentication, provider aggregation, kyc, and multi-chain routing. previously i built defi protocols, sub-10ms solana indexing, and confidential wallet infrastructure with sub-5ms signing.
off the clock i'm into home automation, self-hosting, and the kind of small rust tools that make my own life better. also a gamer when i get the chance.
experience
senior full-stack blockchain engineer · consensys
mar 2026 — present
- built fiat on-ramp and off-ramp flows across a self-custody mobile wallet, web dapp, and shared wallet controllers, including apple pay, google pay, and regulated kyc.
- designed nestjs services for quotes, orders, and provider aggregation; secured them with srp-derived wallet auth, oidc-issued jwts, remote jwks verification, and server-side widget url signing.
- extended ramp coverage to non-evm chains and new networks (monad, hyperevm, sei, megaeth) with caip-based quoting, address resolution, and deeplink routing.
- owned a published wallet controller library consumed by mobile and extension clients, holding backwards compatibility for already-released wallets; shipped behind remote feature flags with helm-managed dev/uat/prod rollout.
founding engineer · lys labs
mar 2024 — mar 2026
- architected a defi derivative aggregating ethereum staking and restaking through erc-4626 vaults and an erc-1410 semi-fungible token layer.
- built a solana block parser and real-time indexer running under 10ms/block, plus ai agents that translated on-chain data for non-technical users.
- built non-custodial wallet infrastructure in rust on linux unikernels, using sev-snp enclaves for verifiable isolation and sub-5ms signing.
senior full-stack blockchain engineer · allinfra
nov 2021 — mar 2024
- shipped iot and financial-asset tokenization products spanning smart contracts, react frontends, and node services; reduced gas costs and modernized legacy contract tooling.
- contributed to zk-rollup solutions for data integrity and built contracts that stored and evaluated user-defined algebraic expressions.
- built wallet and transaction infrastructure with aws kms/cloudhsm, private besu networks, custom indexing, and ipfs-backed storage.
software engineer · busymachines
sep 2016 — nov 2021
- built production web platforms in angular and react backed by node, firebase, mongodb, and postgres.
- integrated self-sovereign identity and l2 smart contracts, including a cryptographic, self-verifiable invitation system; led internships and technical interviews.
php developer · freelance
jun 2012 — sep 2017
- delivered cms and e-commerce projects in php, laravel, angular, and jquery while managing clients directly.
stack
languages
rusttypescriptsoliditypythonc++javascriptphp
blockchain
ethereumsolanaerc-4626erc-1410zk-rollupsethers.jshardhatcaip
backend
nodenestjsexpresspostgresredismongodbfirebaseoidc / jwt
frontend
reactnext.jsangular
infrastructure
linuxdockeraws (kms,
cloudhsm)sev-snptailscaleipfskaleidohelm
data
apache flinkredis streamsreal-time
indexing
selected projects
harbormaster
typescript
self-hosted deploy pipeline driving my homelab.
tedee_ble
python
local ble integration for tedee smart locks in home assistant.
my-last-resort
rust
recover encrypted secrets with shamir's secret sharing.
watchdesk
rust
windows service reporting pc & monitor power state to home assistant via mqtt.
verify-diploma
typescript
blockchain-based credential verification — bachelor thesis.
education
- m.sc. machine learning · politehnica timișoara · 2020 — 2022 — thesis: real-time object detection for smart cities
- b.sc. computer science & engineering · politehnica timișoara · 2016 — 2020 — thesis: decentralized accreditation verification on blockchain
honors
- noi info — 1st place
- saguaro technology competition — 1st place
- itec — 2nd place
- grigore moisil national software competition — 2× 2nd place
- information & communication technology olympiad — 2nd place
elsewhere
- github
- meltingice1337
- darius-flavius-costolaș
- [email protected]
- pgp
- cbe2 8dd1 f05d 9eff f44d 592b 4183 4350 1a71 5ce8
- languages
- english (fluent) · french (conversational) · romanian (native)
guest@dfcostolas — zsh
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software engineer, gamer, dreamer, philosopher, blockchain enthusiast.