Top Tech Jobs & Startup Jobs in London

Build and ship software for a crypto startup developing interoperable shared applications. Responsibilities include implementing cryptographic systems, designing protocols, developing and deploying secure smart contracts, building frontend applications, and working across databases and distributed systems. The role involves customer iteration, product prototyping, blockchain infrastructure, software development tooling, and potential growth into research, architecture, or engineering leadership.

Build and maintain scalable React Native applications, APIs, backend systems, cloud infrastructure, and security-focused software for a Solana-based cryptocurrency platform. Responsibilities include performance optimization, monitoring, release management, Agile collaboration, technical project leadership, troubleshooting, documentation, and cross-functional coordination. The role requires shipping multiple React Native apps to production and contributing to high-quality, secure, highly available products.

Own the architecture and delivery of fiat-to-crypto payment infrastructure, including bank and card integrations, payment orchestration, risk and compliance decisioning, double-entry ledgers, reconciliation, wallet operations, and reliable blockchain transactions. Build fault-tolerant APIs, webhook systems, event-driven services, observability, and operational safeguards for a 24/7 platform. Collaborate with Product, Mobile, Compliance, Risk, and Finance teams while participating in production on-call.

Own and execute the company’s growth strategy by sourcing, negotiating, and closing strategic partnerships with funds, DAOs, exchanges, infrastructure providers, and institutional asset managers. Build the partnership pipeline, report on deal flow, represent the company at global industry events, and collaborate with product and marketing teams to drive ERC-7621 adoption and institutional DeFi growth.

Build and maintain secure CI/CD pipelines, infrastructure-as-code, cloud and blockchain security monitoring, container security controls, dashboards, secrets and key management, and secure configuration baselines. Partner with development teams to remediate security findings and improve infrastructure security. The role requires strong backend coding skills in Golang, Rust, or C++, cloud security expertise, containerization, CI/CD, infrastructure as code, and network security knowledge.

Support product data initiatives through SQL analysis, A/B testing, KPI dashboards, product metrics investigation, basic behavioral modeling, and stakeholder reporting. Collaborate with product and engineering teams to generate actionable insights and improve data processes. The role is designed for an analytical learner with 1–2+ years of experience who is developing broader ownership.

Lead European sales expansion for a blockchain security company serving institutional financial and crypto-native clients. Responsibilities include building pipeline, prospecting, managing strategic relationships, conducting product demonstrations, owning complex enterprise sales cycles, closing high-value deals, exceeding quotas, and representing the company at industry events. The role requires strong blockchain and digital asset custody knowledge, independent territory management, and collaboration with product, marketing, and partnerships teams.

Drive liquidity growth by identifying and engaging institutional and on-chain liquidity providers. Build targeted outreach using on-chain data, create tailored value propositions, support capital deployment and yield optimization, coordinate acquisition packages with BD and incentives teams, manage key LP relationships, and track pipeline and TVL attribution.

Designs, specifies, integrates, tests, and supports spacecraft electrical power subsystems. Responsibilities include power architecture, detailed electronics design, requirements engineering, power budgets, EMC analysis, verification planning, subcontractor management, supplier selection, documentation, customer reviews, integration and testing, flight operations support, and development of future spacecraft power solutions.

Lead architecture and ownership of fiat-to-crypto payment infrastructure, including bank and card integrations, real-time risk and compliance systems, double-entry ledgers, reconciliation, wallet operations, and highly reliable distributed services. The role requires designing low-latency APIs, event-driven workflows, observability, security controls, and operational safeguards while collaborating with Product, Compliance, Risk, Finance, and Mobile teams in a 24/7 production environment.