Backend Lead Developer

DcentraLab; Barcelona; Híbrido; EUR 70.000 - 90.000; Jornada completa

Descripción de la vacante

A pioneering technology company is seeking a Backend Lead Developer to lead backend development efforts, innovate, and ensure scalability of a Web3/AI platform. The ideal candidate will have over 5 years of backend experience, strong Python skills, proven web scraping expertise, and the ability to manage databases like PostgreSQL and MongoDB. This role offers a flexible remote-first work environment and competitive compensation.

Servicios

Flexible remote-first work environment

Opportunity for growth in leadership

Competitive compensation package

Formación

• 5+ years of backend development experience, with at least 2 years in a lead/architect role.
• Strong Python skills (FastAPI, Flask, Django or similar).
• Proven experience with web scraping at scale.
• Solid understanding of PostgreSQL and MongoDB.

Responsabilidades

• Lead backend development for the platform.
• Optimize and maintain PostgreSQL and MongoDB databases.
• Design and maintain robust web scraping systems.
• Manage AWS services and automation.
• Mentor developers and ensure high-quality deliverables.

Conocimientos

Python

Web scraping

Backend development

Database management

AI/LLM frameworks

Problem-solving

Leadership

Herramientas

PostgreSQL

MongoDB

AWS

Scrapy

FastAPI

Descripción del empleo

Remote

Location:Remote/Belgrade

Type:Full-time

Web3 Index is a business development tool designed to discover, analyze, and curate the most comprehensive information about blockchain and crypto projects.

We aggregate and enrich data from sources like CoinGecko, CoinMarketCap, CypherHunter, and more. Using AI (ChatGPT, Perplexity, CrewAI), advanced scraping techniques, and databases (PostgreSQL, MongoDB), we deliver high-quality, actionable insights to users.

• AI-powered search & embeddings using MongoDB Vector DB.
• AI agents that research and validate project data.
• Integrations with TalkJS, Apollo, Slack, Twitter, Cloudflare, Postmark, Tranzilla, SimilarWeb, and more.

We are now looking for aBackend Lead Developerto lead our technical backend efforts, drive innovation, and ensure scalability of our growing platform.

Responsibilities

• Lead backend development: Drive feature design, architecture decisions, and technical roadmap for the platform.
• Research & Development (R&D): Experiment with new technologies, AI models, and scraping methods to continuously improve data quality and system performance.
• Web scraping & data pipelines: Design and maintain robust scraping systems using Python libraries (e.g., Scrapy, Requests, BeautifulSoup, Playwright).
• Database management: Optimize and maintain PostgreSQL (with Alembic/Alchemy) and MongoDB (vector search/embeddings).
• AI & agent integration: Work with LLMs (ChatGPT, Perplexity) and CrewAI to build and scale AI-driven features.
• DevOps & infrastructure: Manage AWS services (S3, EC2, Lambda, CloudWatch, API Gateway, SageMaker) and automation (Bash scripting, cron jobs).
• Blockchain expertise: Analyze and interact with smart contracts (Solidity – entry level), understand blockchain data structures, and integrate relevant protocols.
• Team leadership: Mentor developers, perform code reviews, enforce best practices, and ensure high-quality deliverables.
• Integration management: Oversee and expand integrations with 3rd-party APIs and services (TalkJS, Slack, Twitter, Apollo, etc.).
• 5+ years of backend development experience, with at least 2 years in a lead/architect role.
• StrongPythonskills (FastAPI, Flask, Django or similar).
• Proven experience withweb scrapingat scale.
• Solid understanding ofPostgreSQL(schemas, migrations, performance tuning) andMongoDB(vector DB, embeddings).
• Familiarity withAI/LLM frameworksand data pipelines.
• Hands-onAWS experience(EC2, S3, CloudWatch, API Gateway, Lambda, SageMaker).
• Knowledge ofblockchain/web3 ecosystems, with the ability to read/write Solidity contracts (entry-level).
• Excellent problem-solving skills and ability to take ownership of complex systems.
• Strong communication and leadership abilities.

Nice-to-Have

• Experience with CrewAI or other agent frameworks.
• Knowledge of data enrichment and NLP pipelines.
• Exposure to business intelligence tools and analytics.
• Open-source contributions or published work in scraping/AI/blockchain.

What We Offer

• Opportunity to lead a cutting-edge Web3/AI product.
• Work with modern stacks (AI, blockchain, web scraping, embeddings).
• Flexible remote-first work environment.
• Growth potential in leadership and architecture.
• Competitive compensation package.

About DcentraLab

Since 2017, DcentraLab has been a pioneering force in Web3 and blockchain development. Expanding beyond its initial product, 2Key, DcentraLab has introduced innovative solutions such as Hord, ChainPort, TokensFarm, and DcentraLab Diligence, with a commitment to ongoing growth. Through a relentless pursuit of cutting-edge technologies, DcentraLab remains at the forefront, shaping the future of decentralized ecosystems and blockchain-based products.