Senior Backend Engineer
WEB3 Ventures Pty Ltd trades as Block Earner, an Australian blockchain-powered fintech providing crypto-backed lending, cryptocurrency trading, treasury services, SMSF crypto investing, OTC trading, and related credit infrastructure.
Funding history
Projects
About WEB3 Ventures Pty Ltd
Block Earner is the operating brand of WEB3 Ventures Pty Ltd, founded in 2021 and headquartered in Sydney, Australia. Its current platform lets eligible Australian individuals and businesses buy, sell, store, and transfer 350+ cryptocurrencies; borrow Australian dollars using crypto as security; access business treasury and OTC services; and use SMSF-focused crypto accounts. The company is registered with AUSTRAC and operates lending under Australian Credit Licence 542689. Credit is provided by related entity Web3 Loans Pty Ltd and managed by WEB3 Ventures Pty Ltd trading as Block Earner.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will design, build, and operate Java backend services from initial design through production support. You will use AI-assisted, specification-driven development; build secure APIs and financial workflows; operate AWS infrastructure; integrate external partners; contribute to security and compliance controls; and improve engineering practices through reviews and design documents.
Requirements
- AI-first engineering approach with specification-driven development using AI models and coding agents
- 5–8 years of professional Java backend engineering experience
- Hands-on Spring and Spring Boot experience
- Experience with Spring Security, Spring Data, and transaction management
- Hands-on AWS experience, including IAM, networking, managed databases, queues, and infrastructure as code
- Security engineering experience including OAuth/OIDC, secrets management, encryption, and secure SDLC practices
- Relational database experience with Amazon RDS, PostgreSQL or MySQL, SQL, schemas, indexing, migrations, transactions, consistency, and concurrency
- Experience with distributed systems, event-driven architecture, messaging, idempotent processing, and partial-failure recovery
Responsibilities
- Use AI models and coding agents to produce, review, test, and harden production code
- Shape AI development specifications, conventions, guardrails, and review practices
- Design, build, and own Java backend services
- Build secure APIs, data models, and services
- Implement authentication, authorization, secrets management, encryption, and least-privilege access
- Ensure reliability through idempotency, reconciliation, safe retries, failure states, and audit trails
- Shape AWS infrastructure, observability, alerting, and incident response
- Build resilient integrations with external partners
- Contribute to threat modelling, code review, vulnerability management, and compliance controls
- Raise engineering standards through code review and design documents
Benefits
- Equity options
- Flexible working hours
- Hybrid work options