Portfolio

Experience

December 2024 — Currently

Leading MEV team on Ethereum, operating since 2020.

Lead Blockchain Engineer (Ethereum)

Skills: Go, go-ethereum, MEV-Boost / PBS, TEE / Intel TDX, Kurtosis, Kubernetes, Prometheus / Grafana.

Lead engineer on TOOL (Trustless Orderflow Operations Layer) — an extensive fork of go-ethereum that turns Ethereum’s monolithic 12-second block-building pipeline into a decentralised, TEE-attested P2P network producing 1-second pre-confirmations on mainnet. The product addresses the centralisation and privacy gaps of today’s MEV-Boost supply chain: instead of a few opaque builders gatekeeping orderflow, any operator can compete privately while still committing to common, hardware-verified execution logic.

Sub-slot consensus & leader election — designed and shipped the protocol primitive that lets the network agree on one builder per 1-second sub-slot, so wallets and dApps see sub-second pre-confirmations instead of waiting a full slot.
Commitments & pre-confirmed-state pipeline — pre-executed transaction bundles propagate across the network with their resulting state diffs, so reads (nonce, balance, receipt, simulation) return the already-committed value before the validator seals the block.
MEV-Boost-compatible relay — built the relay / builder coordination layer that drives the standard validator registration / getHeader / getPayload flow and regenerates the payload envelope incrementally as new sub-slots arrive, so the validator always seals the most valuable block available right up to the deadline.
TEE-secured P2P transport — mutual remote attestation gates every peer connection, so only genuine TOOL enclaves join the orderflow overlay. Integrated with Automata Linux (Intel TDX) for verifiable measurement of the shared execution container — proving the common logic is correct without exposing operators’ private strategies.
Close collaboration with the Prysm consensus-client team to surface and discuss several EL ↔ CL behaviours that deviated from spec — important context for an efficient, spec-compliant builder ↔ CL integration. Public discussions: #15541, #15548, #15871. Also authored mev-boost #855 — a concurrent version-negotiation race that could cause a missed slot.
Testing & operations — multi-client integration harness on top of Kurtosis + Kubernetes: ephemeral devnets across all major EL × CL client pairs with full MEV-Boost relay flows. Observability via Prometheus & Grafana.

April 2024 — March 2025

EVAA

EVAA Protocol, Remote

The first decentralized lending protocol on TON.

Lending Protocol Liquidator & Go SDK Author

Skills: Go, evaa-go-sdk, TON / TVM, FunC, tonutils-go, Hornet (IOTA), ADNL / DHT / Overlay P2P, DEX routing.

Authored EVAA’s official Go SDK — evaafi/evaa-go-sdk, the team’s open-source integration layer (config, asset, price, principal, transaction). Published on pkg.go.dev.
Production liquidator bot in Go that held the leading position on EVAA mainnet for an extended period against active competitors. “His programming skills in Go and deep blockchain understanding helped him be the leading liquidator for a long time.” — public recommendation from a competitor.
Custom P2P crawlers and connectors to best-in-class upstream nodes, used to cut end-to-end inclusion latency for price-driven liquidations:
- TON — ADNL / DHT / Overlay crawler that discovers and maintains direct P2P sessions with RPC-grade validator nodes, bypassing the public lite-server bottleneck.
- IOTA — forked the Hornet IOTA full-node (Go) and tuned its peering layer for a privileged P2P link to the network’s price-feed initiator + node-side pre-filtering of irrelevant transactions. The bot reacts at network speed, not at API-poll speed.
Adapted the bot through EVAA’s v2 protocol upgrade — one-shot bad-debt liquidation, reserve factor, custom-payload chaining into DeDust swaps.

November 2022 — December 2024

Ankr, Remote, United States

All-in-one Web3 development hub with high-performance RPC connections to 45+ blockchains.

Blockchain Engineer (Backend)

Skills: Go, PostgreSQL, Kafka, ClickHouse, Redis, gRPC, Stripe, Grafana / Prometheus.

Premium plan billing — shipped the per-API-credit Pay-as-You-Go model and the recurring “Deal” subscription, with Stripe (one-time + recurring USD card payments) plus on-chain USDT / USDC payment flows.
User-manager domain — JWT-scoped private endpoints (rpc.ankr.com/<chain>/<JWT>), Projects, Team Accounts with role-based access (administration / finance / development), identity via MetaMask, Google, GitHub.
Usage-statistics pipeline — Kafka ingest → ClickHouse aggregation → PostgreSQL transactional state → Redis hot paths, powering per-project request / latency / cost dashboards in Grafana + Prometheus.

September 2019 — November 2022

Minter (GitHub), Remote, UK

Layer-1 DeFi blockchain on the Tendermint engine — DPoS, in-core AMM with order book, ETH / BSC bridges.

Lead Golang Blockchain Core Developer

Skills: Go, Tendermint, Cosmos SDK, IAVL+, minter-go-node, gRPC, grpc-gateway, minter-go-sdk, Kubernetes.

Lead developer of minter-go-node — owned Tendermint integration, IAVL+ state tree, transaction execution and Minter 2’s in-core AMM with Order Book.
Owned node-grpc-gateway — single Protobuf source compiled into gRPC + REST + WebSocket + Swagger surfaces — and the official minter-go-sdk (v2).
Contributions to upstream dependencies:
- cosmos/iavl #324 — orphan-node cleanup and new DeleteVersionsRange API (released in v0.14.3).
- tendermint/tm-db #134 — bounded GoLevelDB iterator, measurable IAVL-pruning speedup (released in v0.6.3).
- btcsuite/btcutil #161 — BIP-32 leading-zero ser256(p) derivation fix.
Spoke about Minter at Minter Demo Day 2019 and other conferences.

Additional Experience (2016 – 2019)

Period	Company	Role	Stack
Nov 2018 – Sep 2019	Dr.Cash, Moscow	Golang Backend Developer	Go, gRPC, NATS, ClickHouse, PostgreSQL, Kubernetes / Helm
Jul 2018 – Nov 2018	Wormsoft, Moscow	Golang / PHP Backend Developer	Go (Buffalo / Revel), PHP (Yii2), MySQL, Docker
Oct 2017 – Jun 2018	Vitbiomed, Moscow	Fullstack Developer	PHP (Laravel), MySQL, jQuery, Docker
Dec 2016 – Sep 2017	Be on TOP, Vladimir	Fullstack JS / PHP Developer	PHP (Symfony, in-house CMS), MySQL, jQuery

Education / Training

2020, Golang Course Teacher, Netology
2020, The Process Communication Model
2017, Vladimir State University — B.Sc., Applied Mathematics & Computer Science, Institute of Applied Mathematics, Physics and Computer Science

Recognition

TON Smart Challenge #2 — 1st place out of 181 (FunC, gas-optimised smart contracts)
TON Smart Challenge #5 & TON Tact Challenge — participant

Blogs

Conferences

2020, GolangConf / Ontico — video
2019, Minter Demo Day

Sergei Klimov