blockchain-engineer

Vivo (Telefônica Brasil) is a leading Brazilian telecommunications company that provides mobile services (prepaid, postpaid, control), fixed broadband (Vivo Fibra), fixed voice, and TV/streaming products (Vivo Play and TV packages). It sells devices and accessories, offers bundled plans (Fiber + Mobile), digital services and apps (content partners like Amazon Prime, Netflix, Disney+, HBO), and features such as 5G connectivity, online customer support and self-service. Vivo serves both individual consumers and business customers across Brazil with nationwide coverage and retail channels.

Vivo (Telefônica Brasil) is part of the Telefónica Group and with more than 94 million customers, of which 75 million mobile and 19 million fixed, we are the largest telecommunications company in Brazil, with nationwide presence and a complete, convergent portfolio of products, combining fixed, mobile and digital services.

Our purpose is “Digitalize to Bring Closer”, helping to build a digital nation and transforming the life of our customers. More and more, we connect people and things with Fiber, 4G and 4.5G and cover more cities with the network quality that only Vivo has.

Today, we cover around 90% of the population with 4G and are accelerating the launch of cities with 4.5G, using carrier aggregation technology. In the fixed operation, we ended 2019 with 21 million homes-passed (HPs) with fiber optic technology, of which 11 million HPs with FTTH (fiber to the home). In addition, all cities with FTTH technology also offer TV over fiber (IPTV), aiming to offer the best speed and experience to our consumers.

At Vivo, we also do more than just telecommunications. Within the Group, we have the Telefônica Vivo Foundation, that is committed to making education a priority, developing projects that are based on human potential and use technology as an instrument in favor of inclusion and digital culture.


Vivo (Telefônica Brasil)

Responsibilities
• Develop Decentralized Identity (DID/VC) solutions backed by blockchain, integrated with enterprise applications and APIs.
• Implement integrations between internal services and ecosystem components (issuance/verification, DID resolution, registries/ledgers, integration with wallets and SDKs).
• Understand and implement major ecosystem standards and specifications (DID/VC, smart contracts when applicable) and corporate integration standards.
• Build reusable blockchain-layer components (node network connections, transactions, events, indexing/query and traceability).
• Develop and test smart contracts, following engineering standards, versioning and security best practices.
• Contribute to hardening and protection of secrets (Vault/Secret Managers, access policies and rotation), guided by technical references.
• Automate tests (integration, contract, regression) and perform end-to-end validation of DID/VC journeys.
• Document technical decisions and contribute reusable guides and templates.
• Develop and test data load flows (ETL).
• Execute and manage change processes according to the company’s change governance (ITSM).
• Monitor pentest reports and remediate vulnerabilities.

Senior Blockchain Analyst, Decentralized Identity (DID/VC), Solution Development

Senior Analyst developing decentralized identity solutions supported by blockchain for Vivo. Collaborating on integrations and implementations that align with corporate architecture strategy.

• Define and implement scalable, secure DID/VC architectures with a blockchain layer (public and/or permissioned) for enterprise use cases.
• Lead the design and execution of integrations between blockchain, identity services and corporate systems (APIs, events, gateways, messaging).
• Ensure consistent adoption of DID/VC, blockchain and smart contract standards and specifications (where applicable), focusing on interoperability and engineering best practices.
• Develop and test data ingestion flows (ETL).
• Implement and use ZKP (zero-knowledge proof) frameworks and Hyperledger technologies (focused on identity).
• Build integrations with certificate issuers.
• Develop and design integrations with identity wallets/agents/SDKs.
• Design end-to-end flows for issuance, presentation and verification of credentials, aligning governance, traceability and operational requirements.
• Define engineering standards for smart contracts: modeling, events, versioning, testing, review and security practices.
• Define environment strategy: deployment and operation of nodes/services (cloud/on-prem/Kubernetes), observability, performance and resilience.
• Establish quality practices: integration and end-to-end testing, contract testing, performance testing and CI/CD automations.
• Produce and evolve reference architectures, guides and technical accelerators to standardize and scale deliveries.
• Participate in and manage change processes according to the company’s ITSM governance for change management.

Blockchain Architecture Consultant – DID/VC

Design and implement scalable DID/VC architectures on public or permissioned blockchains. Lead integrations with identity services, corporate systems, ZKP frameworks and operational practices.

As an Architecture Specialist, you will have the following responsibilities and duties:

• Lead technical Blockchain + DID/VC initiatives end-to-end, from discovery to design, implementation and production support.
• Define, develop and institutionalize standards, specifications and reference architectures for decentralized identity, smart contracts and the use of blockchain as a trust/registry layer.
• Define, develop and test data load flows (ETL).
• Serve as a technical reference for critical decisions: platform selection, network governance, trust model, interoperability, performance, costs and architectural evolution.
• Design and develop solutions in accordance with LGPD (Brazil's General Data Protection Law), interacting with stakeholders and ensuring rules are applied across all specifications.
• Design, develop and evolve complete DID/VC flows, integrations with wallets/agents/SDKs and supporting components (resolution, status, auditing and traceability), considering operation at scale.
• Develop integrations with Certificate Issuers.
• Define, develop and govern engineering standards for smart contracts (when applicable): design best practices, review, testing, security, deployment and versioning.
• Lead deployment and operations strategy: topology, nodes, middleware services, APIs, environment automation, hardening and observability.
• Define a secrets and key protection strategy for the ecosystem (Vault/Secret Managers, KMS/HSM when applicable), including policies, rotation and auditing.
• Mentor, enable and technically lead analysts and consultants, standardizing practices and unblocking complex deliveries.
• Define, develop and document integrations with HSM.

Blockchain Specialist, Decentralized Identity (DID/VC)

Architect Specialist leading Blockchain and DID/VC initiatives from discovery to production at Vivo. Transforming digital identity and ensuring robust solutions in technology.

Hybrid Blockchain Engineers roles in Brazil

Browse 3 hybrid blockchain engineers roles hiring in Brazil plus related opportunities such as crypto, web3, smart contract engineer and defi.

3 jobs found

Senior Blockchain Analyst, Decentralized Identity (DID/VC), Solution Development

Vivo (Telefônica Brasil)

Blockchain Architecture Consultant – DID/VC

Vivo (Telefônica Brasil)

Blockchain Specialist, Decentralized Identity (DID/VC)

Vivo (Telefônica Brasil)