Graphdex.io

About us
We are building a high-load decentralized platform at the intersection of blockchain and fintech: on-chain data indexing, trading automation, and integrations with DeFi and Web3.

Responsibilities

• Design and develop backend architecture: APIs, queues, indexers, bots/workers for on-chain event processing.
• Develop event-driven architecture with idempotency, exactly-once delivery (transactions + deduplication), outbox/inbox, retries, and DLQ.
• Integrate with Web3/EVM/Solana: read and process events, interact with smart contracts, manage nonces, handle reorg/finality, and multi-chain transactions.
• Work with Subgraph (The Graph): design schemas, implement TypeScript mappings, and optimize blockchain data indexing.
• Develop DeFi integrations: Uniswap v2/v3, AMM pools, pricing, liquidity, routing, slippage/MEV resistance.
• Optimize performance: profile hot paths, migrate critical components to Rust, ensure async/tokio efficiency, manage backpressure.
• Ensure observability and reliability: metrics/traces/logs (Prometheus, Grafana, OpenTelemetry), SLO/SLI tracking, degradation and fallback mechanisms.

• Provide leadership: define technical vision, mentor developers, conduct code reviews, prioritize backlog, and introduce best engineering practices.

   

Requirements

• 5+ years of commercial backend development experience.
• 3+ years in blockchain/DeFi (EVM, Solana, on-chain data, smart contracts, integrations).
• 2+ years in a Tech Lead or Team Lead role.
• Strong Rust experience: async/tokio, network programming, performance profiling.
• Proficiency with queues/events: RabbitMQ/AMQP, delivery guarantees, retries, DLQ, message contracts.
• Experience with Blockchain/DeFi: ABI, events, integration with Solidity and Solana programs, multi-chain interactions.

• Knowledge of Subgraph (The Graph): schema design, mappings, indexing optimization.

   

Nice to have

• Production experience with Rust (tokio, async, tracing), low-level performance profiling.
• Knowledge of Go (CLI/tools), ETL pipelines for on-chain data, DWH (ClickHouse/BigQuery).
• Experience with Layer 2 (Optimism, Arbitrum), cross-chain bridges/protocols.
• Experience with MEV, mempool monitoring, gas optimization.
• Familiarity with Web3 tools: Foundry, Hardhat, Ethers.js, web3.js, Anchor (Solana).

About the company

GraphDex is building a unified trading and analytics terminal for DeFi. We aggregate liquidity, trading execution and analytics across multiple blockchains into a single interface.

We are a product Web3 startup with a small, highly technical team. We move fast, release often, and solve real infrastructure challenges.

About the role

We are looking for a Technical Project Manager who understands how Web3 development works and can coordinate engineers in a fast-changing environment.

This role is not about formal sprint bureaucracy or just tracking tasks. We need someone who can see bottlenecks early, coordinate team efforts, and help deliver features and releases under real

market pressure.

Responsibilities

• Coordinate development across backend, frontend and blockchain modules
• Work closely with Founder, QA and Product team
• Break product goals into clear technical priorities
• Identify blockers, risks and weak points in delivery
• Quickly reorganize team focus when priorities shift
• Coordinate integrations, releases and production launches
• Help the team handle bugs, scaling issues and unexpected production problems

Requirements

• Experience in technical project / delivery management from 5 years
• Solid understanding of Web3 / DeFi ecosystem
• Previous software development experience or strong technical background
• Understanding of system architecture, APIs and development workflows
• Experience participating in product launches or high-pressure release cycles
• Strong prioritization and decision-making skills

Will be a strong plus

• Experience with trading platforms or fintech products
• Experience working with Solana or other high-performance chains
• Experience with real-time or high-load systems

Language requirements

Working proficiency in Ukrainian or Russian is required.
English — intermediate level or higher.

What we offer

• Real Web3 infrastructure product (not outsourcing)
• Small expert team with direct communication
• High level of ownership and influence on processes
• Competitive compensation + possible equity