Full Stack Engineer

Company Description Aventis is an ERP-native cross-border B2B payments platform that uses stablecoins and AI-driven routing to make international B2B and supplier payments faster, cheaper, and fully automated from existing finance systems. The platform helps enterprises and mid-market companies reduce cross-border payment costs through lower network fees and improved FX, while cutting settlement times from days to minutes or same-day where supported. Aventis is designed for CFOs, controllers, and AP leaders who want modern, API-like cross-border payments instead of slow, opaque traditional banking processes.

Location: Bangalore or Hyderabad, India

What you'll do:

• Design, build and operate Go services that orchestrate multi-step transactions across internal systems and third-party providers.
• Make every operation safe to repeat: idempotency keys, deduplication and exactly-once effects on top of at-least-once delivery.
• Implement automated retries with exponential backoff and jitter, timeouts and clear handling of terminal failures.
• Build secure webhook ingestion (signature verification, replay protection, durable queuing) and reliable outbound webhook dispatch to partners.
• Own reconciliation, both scheduled batch jobs and event-driven checks, so that internal records always match provider and ledger state.
• Design OLTP schemas in PostgreSQL and keep queries fast through sound indexing, query planning and transaction design.
• Build product features in Next.js and React, with typed contracts shared across the stack.
• Define and evolve infrastructure on AWS ECS and RDS using the AWS CDK in TypeScript.
• Review code, write clear technical designs and help keep patterns consistent across the codebase.

How we build:

• We favour simple, modular design with consistent, repeatable patterns. You'll fit in well if you value:
• Clean domain boundaries - each module owns its data and exposes a small, explicit interface.
• Readable code - written for the next engineer, not to show off.
• Predictable structure - a new service or feature looks like the last one.
• Restraint - no clever abstractions or speculative generality; we add complexity only when a real problem demands it.

What you bring:

• 4–5 years of professional software engineering experience, with full-stack ownership of production systems.
• Expertise in Go for building backend services.
• Expertise in TypeScript, React and Next.js.
• Expertise in PostgreSQL, including OLTP schema design, indexing and query performance tuning.
• Hands-on experience with:
• Service orchestration across multiple internal and external systems
• Idempotency and safe handling of duplicate requests
• Automated retries with backoff
• Secure webhook ingestion and dispatch
• Reconciliation, both scheduled and event-driven
• A track record of choosing simple, consistent designs over clever or over-engineered ones.
• Clear written and verbal communication, especially in design docs and code review.

Nice to have:

Experience in fintech or payments, such as payment rails, ledgers, settlement or PSP integrations.

Experience with stablecoins (a plus, not a requirement).

How we work:

• We hire builders: people who solve hard problems, ship work they're proud of and don't wait to be told what to do.
• Ownership over permission. You'll take a problem from a blank page to production and keep owning it once it's live. If you see something broken, you fix it.
• More responsibility than feels comfortable. We give people real scope early and back them to grow into it. This is a place to do the best work of your career.
• Impact over titles. Good ideas win on merit, not seniority. What you ship matters more than what your title says.
• Hands-on, everyone. Nobody is too senior to write code, debug a production issue or talk to a customer.
• Only build what matters. If it doesn't make cross-border payments faster, cheaper or more reliable for our customers, we don't build it.
• Speed with rigour. We move fast in short cycles, but we're moving money, so correctness is never negotiable.
• Talented peers. You'll work alongside a small, high-calibre team that raises your bar every day.