Senior Backend Engineer

The Role

We’re looking for a senior backend engineer to own and evolve the core backend systems that power:

• Protocol and pool indexing
• Portfolio and allocation logic
• Execution planning and transaction orchestration
• Safety, constraints, and failure handling

You’ll be working closely with the founder (product/system design) and will have real ownership over architecture and technical decisions.

This is not a CRUD role. It is a decision + execution system.

What You’ll Work On

• Design and implement backend services that:
  • Ingest and normalize on-chain protocol data (pools, yields, constraints)
  • Represent pools, allocations, and execution plans as deterministic data structures
• Build allocation and constraint logic (risk caps, concentration limits, eligibility filters)
• Own execution planning:
  • Swaps, deposits, sequencing
  • Batching vs multi-tx flows
  • Simulation and preflight checks
• Implement robust failure handling:
  • Partial execution
  • Slippage errors
  • Protocol unavailability
• Collaborate on agent boundaries:
  • What is deterministic vs flexible
  • What the system is allowed vs forbidden to do
• Help shape monitoring and post-execution state tracking

What We’re Looking For

Required

• 5+ years of backend engineering experience
• Strong system design instincts (you think in invariants, edge cases, failure modes)
• Experience building production systems that interact with external, unreliable dependencies
• Comfort working in ambiguous, early-stage environments
• Strong opinions, weakly held

Strong Plus

• Experience with blockchain or DeFi systems (Solana preferred)
• Experience with financial systems, trading, or risk-sensitive software
• Familiarity with transaction orchestration, batching, or execution pipelines
• Experience designing schemas and APIs that must remain stable over time

AI Scope

AI is used to interpret user intent and generate explanations - not to predict markets or autonomously move funds. You’ll help define clear interfaces and guardrails between AI outputs and backend execution logic.

What This Is Not

• Not a growth-hacking role
• Not a UI-heavy role
• Not “just integrate APIs”
• Not a hype-driven AI project

If you enjoy thinking about what must never happen as much as what should happen, you’ll like this role.

How We Work

• Non-custodial, safety-first mindset
• Product clarity > feature velocity
• Explicit constraints and contracts
• Honest communication about what’s unfinished
• Small team, high trust, real ownership

The founder does not code and is very intentional about hiring senior engineers who care about correctness, architecture, and long-term product integrity.

When applying, mention the word CANDYSHOP to show you read the job post completely.