Backend Lead Developer Lisboa

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 Coin
Gecko, Coin
Market
Cap, Cypher
Hunter, and more. Using AI (Chat
GPT, Perplexity, Crew
AI), advanced scraping techniques, and databases (Postgre
SQL, Mongo
DB), we deliver
- quality, actionable insights to users.

Responsibilities

• Lead backend development: Drive feature design, architecture decisions, and technical roadmap for the platform.
• 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, Beautiful
  Soup, Playwright).
• Database management: Optimize and maintain Postgre
  SQL (with Alembic/Alchemy) and Mongo
  DB (vector search/embeddings).
• AI & agent integration: Work with LLMs (Chat
  GPT, Perplexity) and Crew
  AI to build and scale AI-driven features.
• Dev
  Ops & infrastructure: Manage AWS services (S3, EC2, Lambda, Cloud
  Watch, API Gateway, Sage
  Maker) 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
  - quality deliverables.
• Integration management: Oversee and expand integrations with 3rd-party APIs and services (Talk
  JS, Slack, Twitter, Apollo, etc. ).
• 5+ years of backend development experience, with at least 2 years in a lead/architect role.
• Strong Python skills (Fast
  API, Flask, Django or similar).
• Proven experience with web scraping at scale.
• Solid understanding of Postgre
  SQL (schemas, migrations, performance tuning) and Mongo
  DB (vector DB, embeddings).
• Familiarity with AI/LLM frameworks and data pipelines.
• Hands-on AWS experience (EC2, S3, Cloud
  Watch, API Gateway, Lambda, Sage
  Maker).
• Knowledge of blockchain/web3 ecosystems, with the ability to read/write Solidity contracts (entry-level).
• Excellent
  - solving skills and ability to take ownership of complex systems.
• Strong communication and leadership abilities.

Nice-to-Have

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

About Dcentra
Lab

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

Do you have any experience in blockchain?

• Yes
• No

What is your experience in blockchain & crypto? Please elaborate.