(Senior)Blockchain Security DevOps Engineer
At our company, user security is our top priority, led by a skilled Security Team consisting of seasoned cybersecurity professionals. Our team is globally diverse and possesses deep expertise in Security, Privacy, and Security Compliance.
We take pride in our team members holding international patents for technologies embedded in our security framework. Led by a renowned CISO, our team consistently upholds industry standards, with certifications like ISO27001, ISO27701, ISO22301, PCI:DSS 3.2.1 (Level 1), NIST Tier 4, and SOC 2 Type II. Our Chief Information Security Officer directly reports to the CEO, emphasizing the importance of security within our company structure.
In addition to credentials, our Security Team values practical experience, adaptability, rapid thinking, and continuous learning. As the crypto landscape evolves, our team ensures proactive adaptation and collaborative teamwork to stay ahead of potential threats and protect our user base.
Under the leadership of our esteemed CISO, the Cybersecurity and Data Privacy team includes various functions like Blockchain Security, Operational Security, and Security Governance and Compliance. We foster a growth mindset and emphasize humility, aiming to help individuals reach their full potential through a Security and Data Privacy Compliance-centric approach engrained in our company culture.
We were the first crypto company globally to attain certifications such as ISO27001, ISO27701, ISO22301, and PCI:DSS 3.2.1 (Level 1). Our detailed compliance is third-party verified by SGS, achieving the highest level in NIST Cybersecurity Framework (Tier 4) and NIST Privacy Framework, along with regional certifications including SOC 2 and Data Protection Trust Mark.
Responsibilities
- Maintain and support blockchain infrastructure
- Review and propose blockchain software configurations and network setups
- Develop expertise in Blockchain technology, especially public Blockchain
- Share insights on security threats related to various blockchain technologies
- Establish and maintain team's continuous DevOps lifecycle and automation
- Design and manage cloud computing workloads and ensure cloud security
- Encourage software engineers or system administrators keen on blockchain, automation, and infrastructure to apply
Requirements
- Degree in Computer Science, Engineering, or related field
- 3-5 years of experience in DevOps, system administration, or similar roles
- Proficiency in deploying on various cloud platforms (Azure, Google, Amazon)
- Experience with monitoring tools (Grafana, Prometheus, etc.)
- Hands-on experience with container infrastructures (Kubernetes, Docker)
- Familiarity with logging tools (Fluentd, ElasticSearch, Kibana)
- Expertise in infrastructure as code (Kubernetes, Terraform, Docker, Ansible)
- Basic understanding of blockchain (experience in deployment is a plus)
- Strong grasp of Linux, Networking, Firewall, IDS/IPS
- Ability to troubleshoot, analyze root causes, and learn from successes and failures
- Strong interest in the future of blockchain and adeptness at dealing with ambiguity
Life @ Our Company
- Encouragement to explore big ideas and work with a talented, supportive team
- Dynamic work environment that encourages innovation and proactive problem-solving
- Focus on internal growth and skill development for personal and professional advancement
- Supportive work culture fostering collaboration and mutual assistance towards collective goals
Benefits
- Competitive salary
- Comprehensive medical insurance with dependents' coverage
- Generous annual leave entitlements, including special occasions
- Flexibility in work hours and hybrid/remote options
- Opportunities for career development and internal mobility
- Work perks, including a crypto visa card upon joining
- Various location-dependent benefits available; enquire with our talent acquisition team
Founded in 2016, our company serves millions of customers globally, striving to make cryptocurrency accessible to all. Committed to security, privacy, and compliance, we aim to accelerate cryptocurrency adoption through innovation and empower the next generation of creators and entrepreneurs.
We are an equal opportunities employer, dedicated to fostering a transparent and inclusive work environment for everyone. Diversity and inclusivity are core values, and we welcome candidates with diverse backgrounds, perspectives, and skill sets to enhance our team.
Applicants’ personal data will be used solely for recruitment purposes. Only shortlisted candidates will be contacted.
Venture Associate – AI & Decentralized Infrastructure
Source, diligence, and close early-stage investments in AI-native technologies, decentralized protocols, developer platforms, and compute infrastructure. Work side-by-side with founders post-investment on strategy, hiring, product roadmap, and scaling operations.
Skills & Requirements:
2–4 years in venture capital, startup operations, or technical role (engineering/product background strongly preferred)
Deep understanding of AI models, blockchain infrastructure, open-source ecosystems, and compute markets
Proven ability to build founder networks and spot asymmetric opportunities early
Exceptional analytical skills, written/verbal communication, and comfort with high-uncertainty decisions
Self-starter who moves fast and doesn’t need hand-holding
Salary:
$150,000 – $220,000 USD base + meaningful carry + equity upside + full benefits
Description:
Sirex.vc backs visionary founders redefining the open digital economy with asymmetric, high-conviction bets. We move at startup speed and expect the same from our team. As Venture Associate you’ll be on the front lines hunting the next 100x opportunities in AI, crypto infra, and compute — while rolling up your sleeves to help portfolio companies win. High risk. Zero apologies. If you live for the thrill of early-stage tech and want to build the future instead of just funding it, we want to talk.
Growth Marketing Lead (User & Volume Growth Focus)
This is not a traditional community manager role. We’re looking for someone with a proven track record of onboarding users, increasing engagement, and directly contributing to product adoption and transaction/activity volume.
What You’ll Own
Develop and execute user growth strategy end-to-end
Drive measurable increases in active users and platform volume
Build acquisition funnels (organic + partnership-driven)
Optimize onboarding flows and activation metrics
Lead social presence across Twitter/X and other platforms
Represent the project in Twitter Spaces and relevant community events
Launch and manage growth campaigns, incentives, and referral programs
Track and report on growth KPIs (CAC, activation rate, retention, volume impact)
Must-Have Experience
Proven track record of growing users and/or trading/activity volume in a startup, Web3, fintech, or SaaS environment
Demonstrated ability to turn social presence into measurable growth
Experience hosting or speaking in Twitter Spaces and similar forums
Strong understanding of growth funnels, activation metrics, and retention loops
Data-driven mindset (comfortable with analytics tools and experimentation)
Bonus Points
Experience in crypto, trading platforms, or financial products
Experience designing referral or incentive systems
Existing relevant audience/network
What We Care About
We don’t care about vanity metrics (likes, impressions).
We care about:
Active users
Retention
Conversion
Volume growth
Sustainable acquisition loops
If you’ve scaled a product before and can show real numbers behind your impact, we want to talk.
Senior Blockchain Engineer
Protocol Core: Development and optimization of L2-settlement logic on Solidity/Yul.
Bridge Security: Designing secure cross-chain gateways with protection against double spending and reorgs.
Node Infrastructure: Optimizing the interaction of node validators with the EVM stack.
Gas Engineering: Extreme cost reduction for publishing data in L1 (Deneb/Cancun-ready).
Requirements:
Deep knowledge of Solidity (0.8.20+) and Assembly (Yul).
Experience working with Foundry (Fuzzing/Invariants) and understanding the architecture of OP Stack or Arbitrum Orbit.
Skills of working with indexers (The Graph/Envio) and the RPC layer.
Social media manager
