Senior Software Architect

Summary

We are hiring a Senior Software Architect to own the technical design of the systems Delta6Labs builds across exchanges, wallets and custody, trading infrastructure, and the white-label core that underpins our client deployments. You will report to the CTO / VP of Engineering & Product Development and work across every squad without owning any of them.

What you will own

System and platform architecture

• Design end-to-end architecture for new platforms and major subsystems from context and constraints through service decomposition, data models, integration contracts, and deployment topology.
• Design high-throughput, low-latency paths order matching, order-book and market-data distribution, risk checks, liquidity routing against explicit written latency, and throughput budgets rather than hopeful
• Design wallet and custody architecture: hot, warm, and cold segregation, MPC and multi-signature schemes, key lifecycle and rotation, withdrawal approval and limit flows, and integration with providers such as
• Own data architecture relational modeling, event schemas and their evolution, caching strategy, analytical and time-series stores, retention, and data-residency requirements across jurisdictions.
• Define non-functional architecture explicitly: availability and latency targets, failure domains and blast radius, degradation behavior, capacity headroom, and disaster-recovery design with real RPO and RTO figures.

Reuse, the white-label core and technical strategy

• Own the architectural line between the reusable platform core and client-specific extension so customization happens at configuration and extension points rather than by forking, and one client’s requirement does not become everyone’s regression.
• Design tenant isolation, configuration, and feature-flag models that let us onboard a new client without re-architecting, and ship a fix to one without endangering the rest.
• Maintain reference architecture and reusable building blocks for our recurring product shapes — CEX, derivatives, wallet, and launchpad, so each engagement starts from proven ground rather than a blank
• Own the technology radar with the CTO: what we standardize on, what we pilot, what we deliberately retire, and the honest build-versus-buy calls on custody, market data, compliance, and infrastructure.
• Produce the architectural roadmap for paying down structural debt and sequence it so remediation lands alongside delivery rather than competing with it.

Security and compliance by design

• Threat-model high-value flows authentication, withdrawals, key operations, privileged and admin access, third-party callbacks, and design controls in from the start rather than bolting them on after an audit finds
• Own the architecture of authentication, authorization and tenancy boundaries, secrets and key management, least privilege, and tamper-evident audit trails.
• Architect integration with compliance and analytics vendors – KYC/AML (SumSub, Veriff), blockchain analytics (Chainalysis), sanctions screening – including failure and fallback behavior for when a vendor is down and onboarding cannot simply stop.
• Set the architectural standards and review criteria for smart-contract work, and act as our technical counterpart in external audits and penetration tests.

Client solutioning and pre-sales engineering

• Translate client requirements – often expressed commercially or in regulatory language into architectures that are buildable, supportable, and honestly estimated.
• Lead technical discovery and solution design for new engagements: constraints, integrations, jurisdictional requirements, non-functional targets, and the assumptions everything else rests on.
• Support pre-sales with architecture walkthroughs, feasibility assessments, effort and risk shaping, and RFP responses, and say clearly when a request is technically unwise before it becomes a commitment.
• Represent Delta6Labs credibly in front of client CTOs, security teams, and auditors, and leave them more confident than when the meeting started.

Technical leadership without direct authority

• Write documents that carry decisions design docs, RFCs, and architecture decision records that state the problem, the options, the trade-offs, and the reasoning clearly enough that an engineer can build from them and a successor can understand them in two years.
• Run the architecture review practice: review significant designs before they are built and critical code after and give feedback that improves the design rather than merely signaling seniority.
• Mentor senior engineers and tech leads toward architectural thinking and grow the next generation of architects deliberately rather than by accident.
• Build consensus across squads, Product, QA and DevSecOps – in this role, you will need to be persuasive far more often than you get to be decisive.
• Stay hands-on: prototype the risky part, benchmark the assumption, and debug the incident nobody else Architecture that is never validated in code is speculation.

What you must bring

• 12+ years building production software, including 5+ years as an architect, principal engineer, or equivalent senior technical authority.
• A portfolio of systems you personally designed that reached production and stayed there, with the ability to explain the constraints, the trade-offs you chose, and what you would do differently now.
• Deep distributed-systems expertise: service decomposition, event-driven architecture, streaming and messaging (Kafka, RabbitMQ or similar), consistency and consensus trade-offs, idempotency, and designing for partial failure as the normal case.
• Genuine hands-on depth in at least one of C++, js/TypeScript, or Python, databases with the fluency to read and reason across the others.
• Demonstrated architectural ownership of a high-throughput, low-latency, or high-transaction-volume platform in fintech, payments, trading, exchange, or a comparable domain.
• Proven, hands-on production experience in at least one of the following two domains:
  • Crypto / blockchain: building or architecting exchanges, wallets and custody, on-chain integrations, node infrastructure, transaction lifecycle, and settlement across major chains (e.g. Bitcoin, Ethereum/EVM, Solana), with a working understanding of consensus, finality, gas/fee mechanics, and smart-contract interaction.
  • HFT / trading infrastructure: developing matching engines, order-management and execution systems, market-data feed handlers, pre-trade risk checks, and exchange/FIX connectivity, with a track record of measuring and optimizing tail latency (microsecond to low-millisecond) and throughput under real market load.
• Strong data architecture skills: relational modeling and query performance at scale, caching, schema, and event evolution, and choosing appropriately between relational, time-series, analytical and NoSQL
• Deep API and integration design experience – REST, WebSocket, including versioning, contracts, rate limiting and authorization models fit to hand to a third party.
• Strong cloud and infrastructure architecture competence: AWS or GCP, containers and Kubernetes, infrastructure as code, CI/CD, observability, and cost-aware design.
• Security architecture instincts appropriate to systems holding customer funds: threat modeling, authentication and authorization, key and secret management, least privilege, and auditability.
• Exceptional written This role produces documents other people build from; if you cannot write a clear design doc, you cannot do this job.
• The judgement and composure to defend a technical position with senior engineers and to explain risk plainly to executives, clients, and auditors.

Education

B.E. / B.Tech / M.C.A. in Computer Science, Engineering, or a related discipline. Equivalent practical experience considered.

Nice to have

• Smart-contract architecture and audit experience, including upgradeability patterns and known failure
• Experience with custody and key-management systems: MPC, multi-signature, HSMs, or providers such as
• Financial-systems fundamentals: double-entry ledgers, reconciliation, fee engines, market-data normalization, and regulatory reporting.
• Prior architect experience in a product-and-services organization with a multi-tenant or white-label delivery model and client-facing technical responsibility.
• Working knowledge of standards relevant to fintech and digital assets: OWASP, PCI-DSS, SOC 2, ISO 27001, and AML/KYC obligations.
• Open-source contribution, published technical writing, or conference speaking in distributed systems, fintech or blockchain.