Software Engineer, Data Infrastructure
$200,000/year + Equity

#vacancy #web3 #data #engineering #backend #infrastructure #alchemy #newyork #fulltime

Company: Alchemy

✦ Job Denoscription:
Alchemy’s mission is to bring Web3 to a billion people by providing developers with the tools to build scalable onchain products. The platform powers over 70% of top Web3 teams and serves 100+ million users globally. As a Software Engineer in Data Infrastructure, you’ll work on one of the most advanced distributed systems in blockchain, maintaining and optimizing high-throughput data pipelines and backend systems.

Key Responsibilities:
– Maintain batch pipelines powering production systems
– Build frameworks for data pipeline creation and debugging
– Monitor data quality, latency, and ensure reliability
– Develop DAG workflows for batch processing and storage
– Aggregate logs across multiple clouds and regions
– Design and implement next-generation data warehouse systems

✦ Qualifications:
– Bachelor’s in Computer Science, Engineering, or related field
– 4+ years of experience in data infrastructure or data engineering
– Proficiency with orchestration frameworks (Airflow), Jenkins, Pachyderm

✦ Preferred Qualifications:
– Experience with large-scale distributed systems
– Strong knowledge of data quality monitoring and alerting systems

Location: New York, USA

Contact:
https://jobs.arbitrum.io/companies/alchemy-2/jobs/60521550-software-engineer-data-infrastructure#content

Apply via Alchemy careers page — mention
t.me/holder_job_devs

ML Researcher & Engineer
$150,000–180,000/year (gross)

#MLResearch #AI #Compilers #LLM #RemoteJob #SeniorEngineer #FinanceTech #Research #DeepLearning

Company: Stealth FinTech AI Startup

✦ Job Denoscription:
A research-driven startup is building a foundation model for financial markets at the intersection of LLMs and time series. The team is looking for a Senior/Lead ML Researcher & Engineer to design compiler-based systems leveraging large language models and reinforcement learning for code optimization and hardware-aware performance.

Key Responsibilities:
– Develop LLM-based compilers using IRs (LLVM, MLIR, CUDA, Verilog)
– Apply research from SwizzlePerf, COMPASS, Cuda-L1, etc.
– Integrate RL and meta-prompts for compilation optimization
– Build models for code analysis and hardware-level efficiency
– Prototype AI agents for compilation stages

✦ Qualifications:
– Proven experience with LLMs for code generation or compilers
– Strong research and production coding skills
– Proficiency with ML frameworks (PyTorch, TensorFlow)
– Ability to collaborate with low-level engineering teams

✦ Preferred Qualifications:
– Knowledge of compilers and intermediate representations
– Experience applying LLMs for code optimization
– Background in low-level or hardware-oriented development
– Product mindset and innovation focus

Location: Remote or relocation to Serbia / Netherlands (visa support provided)
✦ Please forward the job posting when applying.


Contact: @sobolevavalery


🦍 @holder_job_devs

Fullstack Developer (Solidity + React)
$3000–5000/month (USDT)

#Developer #Fullstack #Web3 #Crypto #DeFi #Solidity #React #Remote #Удаленно

Company: Confidential Web3 Project (DeFi MVP)

✦ Job Denoscription:
A Web3 team is developing a DeFi MVP and seeks a Fullstack Developer skilled in Solidity and React. The role involves building and integrating smart contracts for AMM and Lending protocols, contributing to architecture design, and shaping the project’s technical foundation.

Key Responsibilities:
– Develop and deploy smart contracts (AMM / Lending logic)
– Integrate blockchain contracts with frontend
– Collaborate on MVP architecture and core logic

✦ Qualifications:
– Strong knowledge of Solidity and Hardhat
– Proficiency in TypeScript, React, MobX
– Understanding of AMM and Lending protocol mechanics

✦ Preferred Qualifications:
– Previous experience in DeFi or Web3 product development
– Ability to work autonomously on MVP-stage projects

Location: Remote (flexible, part-time/project-based)

Contact: @kakdelalidok
✦ Please forward the job posting when applying.

🦍 @holder_job_devs

Web3 Fullstack Junior Developer (Growth Opportunity)
~$5000 / month

#Web3 #Fullstack #DeFi #Blockchain #Developer #Remote

Company:
Metrix Finance — a decentralized finance platform providing advanced on-chain analytics and portfolio management tools. The team is expanding and looking for a motivated Web3 Junior Developer eager to grow in a fast-paced DeFi environment.

✦ Job Denoscription:
Join Metrix Finance to enhance platform performance, fix bugs, and implement new features. The role offers exposure to subgraphs, APIs, smart contract integrations, and collaborative work on scalable Web3 solutions. Ideal for developers ready to level up in DeFi and fullstack blockchain development.

Key Responsibilities:
– Fix existing bugs and improve UI/UX.
– Implement new technologies (subgraphs, substreams).
– Develop new platform features and protocol integrations.
– Create data retrieval/indexing solutions (contracts, APIs, subgraphs).
– Collaborate with team members, participate in code reviews and architecture discussions.
– Stay updated on blockchain security and trends.
– Provide daily progress updates.

✦ Qualifications:
– Hands-on Web3 development experience and DeFi knowledge.
– Background in SaaS development.
– Proficient in JavaScript / TypeScript.
– Familiar with Web3 tools (Ethers.js, Web3.js, Viem).
– Understanding of Next.js, TailwindCSS, PostgreSQL, Prisma.
– Knowledge of Web3 data access (API, subgraphs, RPC).

✦ Preferred Qualifications:
– Experience with smart contracts (EVM / Solana).
– Familiarity with subgraphs and data caching.
– Strong math/technical background.
– Personally engaged in DeFi.
– Experience with Wagmi hooks.

Location: Remote (Full-time, flexible hours)

Contact: @jakeacall

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

Senior Machine Learning Engineer (LLM / NLP / AI)
$5,000–$9,000

#MLE #AI #LLM #NLP #MachineLearning #Remote

Company:
HighSky — a full-cycle AI company developing solutions from business analysis to production-ready ML systems. The team builds and maintains advanced models in text, audio generation, and blockchain data extraction.

✦ Job Denoscription:
We are seeking a Senior Machine Learning Engineer to design, develop, and deploy ML solutions across diverse domains. The role involves building MVPs, researching SOTA models, and delivering production-grade systems that drive real-world impact.

Key Responsibilities:
– Develop MVPs for text/audio generation and data extraction tasks.
– Design solution architectures, select databases and infrastructure.
– Research, test, and adapt SOTA algorithms for production.
– Fine-tune ML models and optimize hyperparameters.
– Maintain and monitor deployed ML systems.

✦ Qualifications:
– 5+ years of experience in ML/DL and data analysis.
– Strong Python development skills.
– Proven commercial experience building ML products from scratch.
– Degree in Computer Science, Applied Mathematics, or related field.

✦ Preferred Qualifications:
– Academic research in Computer Science.
– Achievements in Kaggle/Boosters competitions or hackathons.


Location: Remote
Contact: @perovvaa

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

React Web3 Developer
~$5000

#React #Web3 #Frontend #TypeScript #Blockchain #Remote

Company:
Unigox — a next-generation infrastructure platform bridging fiat and crypto. The team is building a secure, automated, and global ecosystem for managing digital assets efficiently.

✦ Job Denoscription:
We are looking for a React Web3 Developer to build and maintain a high-quality P2P web platform. The role involves creating adaptive mobile-first interfaces, integrating smart contracts and wallets, and ensuring smooth, secure product operation in collaboration with backend and design teams.

Key Responsibilities:
– Develop and maintain a P2P web platform using React, TypeScript, and Web3.
– Create adaptive, mobile-first user interfaces with strong UX focus.
– Integrate smart contracts and crypto wallets using modern Web3 tools.
– Collaborate with backend and design teams on new features and releases.
– Troubleshoot UI/integration issues and ensure product stability.
– Participate in code reviews and maintain the shared component library.

✦ Qualifications:
– 3+ years of experience as a Frontend or React Developer in production projects.
– Strong knowledge of React, TypeScript, hooks, and modular frontend architecture.
– Hands-on Web3 experience (wallets, blockchain data, transactions).
– Skilled in API integration, state management, and performance optimization.
– Good design sense and ability to deliver pixel-perfect Figma layouts.
– Proactive and communicative, comfortable in a startup environment.

✦ Preferred Qualifications:
– Understanding of blockchain networks (EVM, Solana) and P2P transaction logic.

Location: Remote

Contact: @dendidoto

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

Senior Backend Ruby Developer (TON Ecosystem)
from $5,000/month (net) + bonuses

#Ruby #Backend #TON #Blockchain #DeFi #Remote

Company:
CryptoBank TON — a crypto banking platform built on The Open Network (TON) ecosystem. The team develops high-load systems for secure, fast, and automated blockchain-based financial solutions.

✦ Job Denoscription:
We’re looking for a Senior Backend Ruby Developer with proven TON experience to build and optimize the backend of a next-generation crypto banking platform. You’ll design scalable systems, integrate blockchain components, and ensure top-level security and performance.

Key Responsibilities:
– Develop backend logic in Ruby for the CryptoBank TON platform.
– Integrate with the TON ecosystem, Prisma ORM, and Neon DB.
– Optimize performance and handle high-load architecture.
– Work with APIs (Hono, Vite) and ensure code quality via reviews.
– Collaborate with the team on architecture and product improvements.

✦ Qualifications:
– 5+ years of professional experience in Ruby backend development.
– Proven hands-on experience with The Open Network (TON).
– Strong understanding of algorithms, data structures, and security.
– Experience with Vite, Hono, Prisma (ORM), and Neon (PostgreSQL).
– Ability to work in high-load environments and deliver stable systems.

✦ Preferred Qualifications:
– Familiarity with DeFi and smart contracts on TON.
– Knowledge of JS/TS for frontend or integrations.

Location: Remote
Contact: @leo_lomaev

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

SENIOR Solidity Backend Engineer (DeFi Protocol)
$4,000–$8,000/month + token incentives

#Solidity #DeFi #SmartContracts #Blockchain #Engineering #Remote

Company:
Stealth-stage DeFi project building the next generation of on-chain financial infrastructure. The protocol merges advanced virtual market mechanics, collateralized systems, and automated risk management into a secure, scalable framework.

✦ Job Denoscription:
We’re looking for a Senior Solidity Engineer to architect, implement, and optimize smart contracts for a high-performance DeFi protocol. You’ll collaborate with researchers and quants to build modular, secure systems that define the next evolution of decentralized finance.

Key Responsibilities:
– Design and deploy advanced Solidity contracts for core protocol logic.
– Review and mentor junior engineers, ensuring code quality.
– Translate financial models into on-chain architectures.
– Work with internal frameworks (Singleton patterns, Flash Accounting).
– Enhance protocol scalability, performance, and maintainability.

✦ Qualifications:
– 3+ years of professional Solidity experience with live deployments.
– Deep knowledge of DeFi architecture, gas optimization, and security.
– Strong grasp of AMM and virtual market frameworks.
– Proficiency with Foundry, Hardhat, and testing environments.
– Ability to lead and make key architectural decisions.

✦ Preferred Qualifications:
– Experience in protocol research or smart contract audits.
– Familiarity with complex collateralized and accounting systems.

Location: Remote
Contact: @dkdancen

🦍 Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

Rust Engineer (Blockchain)
Salary: $6,000–$8,000/month

#Rust #Blockchain #SmartContracts #RemoteWork #DeveloperJobs #Crypto

Company:
Blockchain development team building secure, high-performance decentralized systems. The company focuses on blockchain interoperability, scalability, and next-gen smart contract solutions.

✦ Job Denoscription:
We are hiring a Rust Engineer to design, build, and optimize blockchain applications. The role includes developing smart contracts, integrating with multiple platforms, and ensuring code quality and system performance in a remote, full-time environment.

Key Responsibilities:
– Develop and maintain blockchain applications in Rust.
– Optimize and test smart contracts for performance and security.
– Integrate with blockchain platforms (Polkadot, Solana, Near).
– Design system architecture and evaluate solutions.
– Conduct testing, debugging, and performance improvements.
– Participate in planning and time estimation.

✦ Qualifications:
– 3+ years of experience with Rust.
– Strong knowledge of blockchain technologies and ecosystems.
– Experience with Polkadot, Solana, or Near.
– Solid grasp of algorithms, data structures, and testing practices.
– English level: Intermediate or higher.

✦ Preferred Qualifications:
– Experience with WebAssembly, Solidity, or Move.
– Knowledge of Docker and CI/CD workflows.
– Understanding of cryptography and consensus mechanisms.
– Contributions to open-source projects.

Location: Remote (Full-time)
Contact: @limar_sheref

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

Middle / Senior Nest.js Backend Developer
Salary: $1,500–$4,500 net (hourly-based)

#NestJS #BackendDeveloper #NodeJS #Web3 #Blockchain #RemoteWork

Company:
MEEET — a blockchain-based social platform that incentivizes real-life interactions through NFTs and tokens. The product combines geolocation, AI-driven features, and Web3 mechanics into a next-gen social experience.

✦ Job Denoscription:
We’re looking for a Middle/Senior Backend Developer proficient in NestJS to build core backend services powering mobile and web applications. You’ll work on blockchain integrations, geolocation systems, AI-driven features, and WebSocket infrastructure in a fast-moving global team.

Key Responsibilities:
– Develop REST APIs using NestJS for mobile and web clients.
– Integrate with BNB Chain (NFTs, tokens).
– Build geolocation and cryptographic verification systems.
– Implement AI assistant integrations, recommendations, and behavior analysis.
– Develop marketplace features and analytics for B2B partners.
– Implement WebSockets and push notification systems.

✦ Qualifications:
– 3+ years of backend experience with Node.js and NestJS.
– Strong knowledge of TypeScript, MongoDB/PostgreSQL, Docker.
– Experience with REST APIs, Git, CI/CD, and Web3 basics.
– English: Upper-Intermediate+

✦ Preferred Qualifications:
– Experience with BNB Chain/Ethereum, Solidity.
– Swagger/OpenAPI, AI/ML integrations.
– Redis, TypeORM/Prisma, geolocation services.
– AWS/GCP, microservices, WebSockets.

Location: Remote (core hours 10:00–16:00 UTC)
Contact: Telegram: @leonety_lety

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

Windows App Developer (Rust / C# / React)
Salary: $3,000–$5,000/month

#Rust #CSharp #React #Windows #DesktopApps #Remote #Middle #Senior

Company:
A product-focused engineering team developing a native Windows desktop application with a multi-module architecture: Rust broker, WinUI overlay, and a cross-platform Tauri/React interface.

✦ Job Denoscription:
We’re seeking a Windows App Developer who feels confident working at the intersection of Rust, C#, and React. You’ll build low-level system modules, Windows overlays, and cross-platform UI components within a modern Tauri-based architecture.

Key Responsibilities:
– Develop and maintain the Rust-based Windows broker (FFI, Windows API automation).
– Build WinUI 3 overlays in C#/.NET for transparent, always-on-top windows.
– Implement UI components in React/TypeScript for Tauri pages.
– Integrate modules through Tauri commands, IPC, and HTTP APIs.
– Ensure performance, stability, and seamless communication across all layers.

✦ Qualifications:
– Intermediate/advanced Rust (Windows API, FFI, tokio).
– Strong C#/.NET experience with WinUI 3 and Windows desktop development.
– Solid TypeScript/React skills (Hooks, modular components).
– Familiarity with Tauri 2.0 (commands, IPC).
– Experience working with Windows SDK, Rust toolchain, Node.js, and .NET 8.0.

✦ Preferred Qualifications:
– Cross-platform desktop development experience.
– Knowledge of C++ Win32 internals or low-level OS automation.
– Strong understanding of multi-module desktop architectures.

Location: Remote
Contact: @Foreverinlovewithsummer
✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

AI Engineer
$4,000–$8,000 (net)

#AIEngineer #Python #MachineLearning #DeepLearning #NLP #LLM #RemoteJob

Company:
AI-focused team building advanced ML systems — from LLMs and NLP models to generative pipelines, deployed in real products.

✦ Job Denoscription:
We’re looking for an AI Engineer to develop, optimize, and deploy cutting-edge AI models. You’ll build production-ready inference pipelines, integrate models into cloud environments, and work with modern LLM/NLP systems while collaborating with a global team operating on PST hours.

Key Responsibilities:
– Build and deploy AI/ML models (LLM, NLP, generative).
– Develop inference pipelines and integrate models into production.
– Work with cloud infrastructure (preferably AWS).
– Optimize model performance and scalability.
– Collaborate with the team across PST time zones.

✦ Qualifications:
– Excellent Python skills.
– Experience with ML frameworks: PyTorch, TensorFlow, or JAX.
– Hands-on experience deploying AI models in production.
– Knowledge of cloud platforms (AWS preferred).
– English: B2 or higher.

✦ Preferred Qualifications:
– Experience fine-tuning LLMs and working with embeddings/vector DBs.
– Knowledge of RAG pipelines and multimodal models.
– Experience with quantization, pruning, distillation.
– Familiarity with LangChain, Hugging Face, Weaviate, Pinecone, Ray.
– Experience integrating AI features into real products.

Location: Remote (Full-time, PST hours)
Contact: @AiSolutionWorldHR
✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS

Senior Full Stack Developer (DEX–CEX Arbitrage Platform)
Salary: $3,000–$5,000+

#FullStack #NodeJS #TypeScript #Trading #Crypto #Arbitrage #Remote

Company:
A technology-driven liquidity provider in the crypto B2B sector. The company builds trading and analytical systems for funds, trading teams, and crypto projects. A new internal product — a DEX–CEX arbitrage engine — is being launched with future integration into the main Trading Platform. Strong performance may lead to growth into a CTO role.

✦ Job Denoscription:
You will work on the core functionality of a high-performance trading platform where speed and accuracy are critical. The role involves architecting and implementing the DEX–CEX arbitrage algorithm, managing exchange integrations, and building dashboards for analytics and strategy monitoring.

Key Responsibilities:
– Build the MVP of a DEX–CEX arbitrage engine.
– Integrate multiple exchanges via API using existing connectors.
– Implement calculations for arbitrage opportunities.
– Develop monitoring, logging, and analytics interfaces.
– Build dashboards for client-facing insights.

✦ Qualifications:
– Proficiency with Node.js / TypeScript (core stack) or Python.
– Experience integrating with crypto exchange APIs (Binance, OKX, Bybit, KuCoin, etc.).
– Understanding of market making, DEX mechanics, trading bots.
– Strong knowledge of CEX integrations (REST, WebSocket, user streams).
– Experience with DEX (EVM) — ethers.js/viem or web3.py.
– Ability to work with AMM data: slot0, liquidity, ticks, reserves.
– Knowledge of data storage for trading systems (orderbooks, trades, IDs, logs).
– Understanding of AMM math (Uniswap v2/v3 formulas, tick-based pricing).

✦ Preferred Qualifications:
– Knowledge of rate limits, gas estimation, batching, slippage.
– Experience with high-load trading systems.

Location: Remote (full-time, flexible)
Contact: @busel_work

✦ Please forward the job posting when applying.

🫡 ✦ @HOLDER_JOB_DEVS