Senior Developer/ Tech Lead — Swipeo, Crypto Card Platform

As a Senior Developer and Tech Lead at CSG Technosol, you own the full technical direction of Swipeo, a live, Visa-powered crypto card platform where users top up with BTC, ETH, USDT, USDC or fiat, get a virtual card instantly, and spend at 100M+ merchants worldwide. The product is in users' hands; your job is to take it from launched to unmissable - scaling the architecture, hardening the spend engine, and leading the team through the next phase of growth.

What you'll do

• Own the platform architecture across Go backend services, React web app, and Flutter mobile apps - evolve the design, pay down technical debt thoughtfully, and make calls on what to build versus buy as you scale.
• Scale the spend engine for 10x volume: a card authorization arrives, you check the balance, lock a rate, convert, and approve in sub-second latency. You'll harden this path for failure modes, rate-lock logic, and graceful degradation.
• Deepen the wallet and custody layer - expand chain and asset coverage, tighten hot/cold segregation, and level up institutional custody and MPC integrations with platforms like Fireblocks or BitGo.
• Extend the card experience beyond instant freeze, number rotation, per-merchant limits, and single-use virtuals - drive deeper issuer-processor integrations, new markets, and new card capabilities.
• Make compliance a superpower: tiered KYC, AML transaction monitoring, sanctions screening, Travel Rule, and PCI DSS - strengthened as you grow into new jurisdictions, built into the platform rather than bolted on after audits.
• Run treasury and reconciliation - manage stablecoin and fiat float, exchange/OTC liquidity for conversions, transparent FX pricing, and penny-perfect reconciliation across on-chain ledgers, internal balances, and card network settlement files.
• Lead the engineering team: grow and mentor engineers, set security and code-review culture, and be the technical voice with custody partners, card networks, and regulators.

What you bring

• Deep, hands-on crypto expertise in wallet architecture, private key management, multi-chain integrations, stablecoins (USDT/USDC), transaction finality, and the operational realities of moving digital assets safely at scale.
• Experience scaling a live crypto payments, crypto card, or exchange-grade platform where user funds lived on-chain and got spent in the real world, and you've grown it without breaking it.
• Strong Go expertise for backend services, plus working fluency in React and Flutter to lead, review, and unblock a full-stack team.
• Card-side fluency: issuer-processor integrations, real-time authorization flows (ISO 8583 or modern processor APIs), and just-in-time funding models.
• 8+ years in software engineering, with 3+ years leading teams on fintech, crypto, or payments systems.
• A security-first reflex - threat modeling, key ceremony discipline, and the healthy paranoia of someone who knows what's at stake when assets are bearer instruments.
• Working knowledge of crypto regulation across your markets - VARA (Dubai), FCA (UK), MiCA (EU), and FATF Travel Rule requirements.

Nice to have

• Direct integration experience with Fireblocks, BitGo, Copper, or similar MPC custody platforms.
• Experience building FX/pricing engines, liquidity routing, or exchange connectivity (CEX APIs, OTC desks).
• Smart contract development or on-chain settlement experience (EVM/Solidity).
• Work on adjacent product surfaces: rewards, P2P transfers, swaps, or crypto-backed lending.
• Taking a crypto product through security audits, penetration tests, or licensing processes.

What we offer

• Full-time, on-site role in Noida, India.
• Real product shipped to real users - you will deploy to production in your first week.
• A modern stack without legacy debt: Go, React, Flutter codebase that is young enough to steer and mature enough to matter.
• Global scope: your infrastructure settles transactions for users across the UAE, UK, and worldwide.

About CSG Technosol Pvt

CSG Technosol builds Swipeo (swipeo.io), a live, Visa-powered prepaid crypto card platform where users top up with digital assets or fiat, get a virtual card instantly, and spend at merchants worldwide with real-time conversion and full control over rates and card behavior.