Senior Data Engineer

Unchain Data; Lisboa; Presencial; EUR 60 000 - 90 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

Generous PTO

Work-from-home budget

Healthcare coverage for US-based team members

Resumo da oferta

Unchain Data is seeking a Senior Data Engineer to join its Data Engineering team in Lisbon, Portugal. The role focuses on designing and operating scalable data pipelines for our payments infrastructure. Candidates should have 5+ years of relevant experience, particularly in data pipeline construction and production system operation.

This fully remote position offers competitive compensation and opportunities for travel and team offsites around the world.

Qualificações

• 5+ years of experience in data engineering or data infrastructure.
• Proven ability to build and operate production data systems.
• Strong experience with modern data stack tools.

Responsabilidades

• Design, build, and operate scalable data pipelines.
• Ensure data accuracy, freshness, and observability.
• Develop backend services to expose data to internal platforms.

Conhecimentos

Data pipeline development

SQL expertise

Event-driven architecture

Python programming

Ferramentas

Airflow

ClickHouse

dbt

Descrição da oferta de emprego

About WalletConnect

WalletConnect is one of the core infrastructure teams in Web3 — we build the connectivity layer that lets wallets and apps communicate securely across blockchains. Since launching in 2018, we've grown into a network of 75,000+ apps, 700+ wallets, and 50+ million users. Our mission is to power the financial internet by making digital ownership and payments interoperable and accessible.

We've recently launched WalletConnect Pay — a payments solution that lets merchants and payment providers leverage blockchain rails for new payment experiences, like stablecoin checkout, payouts, and deposits.

Backed by $38M from investors like Union Square Ventures, Shopify, Coinbase Ventures, Circle Ventures, and Uniswap Labs, we're a global, remote-first team that values openness, simplicity, innovation, and ownership.

Why Now

We're entering our most ambitious chapter yet. WalletConnect Pay is an end-to-end crypto and stablecoin payment method built on the world's largest wallet network — already embedded in Stripe, Coinbase Commerce, Shopify, MoonPay, Shift4, and BitPay, with a landmark partnership with Ingenico bringing stablecoin payments to 40M+ terminals across 120+ countries.

As WalletConnect scales into payments, data is becoming foundational — not optional. From wallet connection success rates and transaction health to financial reconciliation, merchant reporting, and operational monitoring, our data systems must be as reliable as the payment flows they track. We're building a next-generation data platform to support real‑time payments infrastructure, developer tooling, and product analytics. This hire joins at the moment we're moving from MVP pipelines to scalable production architecture, and we need a senior engineer who can help design and operate the data foundation behind a global payments network.

The Role

This is a Senior Data Engineer position on the Data Engineering team. You'll work closely with the Data Engineering Lead to design and scale the data platform powering WalletConnect's payments infrastructure and ecosystem analytics.

This role sits at the intersection of data engineering and backend systems. You'll build and operate event‑driven data pipelines, maintain real‑time processing systems, and ensure data quality across high‑volume transactional workflows. You'll also build backend services that expose data to internal platforms and APIs, so teams across the company can consume it.

Day‑to‑day, you'll work with Python, SQL, ClickHouse, Airflow, and dbt within an event‑driven architecture. You'll own the systems you build end‑to‑end — including monitoring, reliability, and data correctness — and collaborate with product, engineering, and infrastructure teams to support new data use cases as the platform grows.

Responsibilities

Data Platform & Pipeline Engineering

• Design, build, and operate scalable data pipelines for WalletConnect payments and platform data — event‑driven, near real‑time processing across high‑volume transaction flows
• Maintain and evolve the real‑time data platform, moving it from MVP pipeline to scalable production architecture
• Model and process transactional and ledger‑style data — financial reconciliation, merchant reporting, wallet fee breakdowns, and settlement tracking
• Contribute to improving the overall data platform architecture as requirements grow

Data Quality & Observability

• Ensure data accuracy, freshness, and observability across critical workflows — payments flow correctness, wallet connection success rates, and transaction health
• Build monitoring and alerting that meets the reliability bar required for financial data systems
• Own data quality across the pipeline — from ingestion through transformation to downstream consumption

Backend Services & Data Access

• Develop backend services that expose data to internal platforms, APIs, and downstream systems so teams across the company can consume it
• Support downstream use cases including financial reconciliation, merchant reporting, operational monitoring, and product analytics
• Collaborate with product, engineering, and infrastructure teams to onboard new data use cases and ensure clean integration points

Ownership & Operations

• Own and operate the systems you build, including deployment, monitoring, and reliability
• Collaborate closely with the Data Engineering Lead on architecture decisions and platform evolution
• Contribute to engineering standards, documentation, and operational playbooks for the data platform

Tech Stack

Our current stack includes Python, SQL, ClickHouse, Airflow, dbt, Grafana, and Preset / Deepnote for data visualization. The architecture is event‑driven with near real‑time processing. Rust is a plus but not required. We're also experimenting with AI‑assisted monitoring and data tooling as part of our platform evolution.

Requirements

Must‑Haves

• 5+ years of experience in data engineering or data infrastructure — you've built, shipped, and operated production data systems
• Strong experience building data pipelines and production data platforms — ingestion, transformation, modelling, and serving
• Comfortable using AI‑assisted development tools/agents, with strong discipline in reviewing, validating, and productionizing generated code
• Expertise in SQL and large‑scale data processing
• Experience with modern data stack tools: Airflow, dbt, ClickHouse, BigQuery, Snowflake, Athena, or similar
• Experience working with event‑driven architectures and real‑time or near real‑time data processing
• Strong programming skills in Python or similar backend languages
• Experience designing systems with data quality, monitoring, and reliability in mind — you treat data correctness as a first‑class concern
• Ability to operate independently and own production systems end‑to‑end in a remote, async team

Nice‑to‑Haves

• Experience in fintech, payments, or financial infrastructure — reconciliation, settlement, ledger reporting, or merchant data
• Experience working with high‑volume event data at scale
• Familiarity with ledger‑style or transactional data models
• Exposure to Web3, blockchain, or crypto ecosystems — on‑chain data, wallet analytics, or token transaction flows
• Rust experience or willingness to learn
• Experience building data platforms in fast‑growing startups where you've shaped the architecture from early stages

Benefits

• Fully remote position with a budget for your home office or work environment
• Regular team offsites to incredible locations around the world
• Opportunities to travel to conferences and community events
• Generous PTO and parental leave
• Meaningful Learning & Development budget
• Competitive compensation package including salary, equity, and potentially tokens
• Healthcare coverage for US‑based team members
• The chance to build at the forefront of on‑chain payments with one of the most recognised companies in Web3