Senior Backend Engineer - Java - Web3 Wallet

About MentTech
MentTech is a forward-thinking technology company dedicated to transforming how mentoring and learning are delivered in the digital age. By combining advanced tools, intelligent systems, and a human-first approach, MentTech helps individuals, teams, and organizations harness the power of mentorship to unlock potential, build skills, and achieve lasting growth.
The Role
We are seeking a Smart Contract Developer responsible for ensuring that game listings within MentTech work properly and ensuring compliance with all game store policies.
Key Responsibilities:
 • Architect, implement, and deploy secure smart contracts for an on-chain Play-to-Earn GameFi ecosystem
 • Lead contract design decisions with a focus on robustness, auditability, gas efficiency, and resilience to attack vectors
 • Mentor/junior developers: perform code reviews, establish standards, best practices in security & testing
 • Collaborate cross-functionally with game designers, backend, QA, and security teams to align smart contract features with product roadmap
 
Qualifications:
 • 2+ years hands‐on experience developing & deploying smart contracts (Solidity / EVM or equivalent) in production environments
 • Track record of writing secure contracts, familiarity with common vulnerabilities (reentrancy, integer over/underflow, front-running, flash loans, etc.)
 • Experience with audits, formal verification, fuzz testing, or other advanced contract assurance methods
 • Strong test suite / CI workflow skills; comfortable using tools like Hardhat, Foundry, Truffle etc.
 • Solid understanding of GameFi mechanics and how on-chain economics work
 
Bonus Points:
 • Experience on multiple EVM chains or Layer-2 / sidechains
 • Knowledge of cross-chain bridges, oracles, NFTs, tokenomics design
 • Contributions to open-source security tooling or prior audit reports or published code you’re proud of
 
Why join MentTech?
At MentTech, we cultivate a culture of flexibility, autonomy, and the freedom to make a real impact on the broader Web3 ecosystem. Experience the advantages of a fully remote working environment where your expertise and contributions are rewarded with competitive compensation tailored to your role and project influence.
Ment Tech Labs
 • Employee Equity & Incentives: Unlock future growth with equity and other potential incentives.
 • Entrepreneurial Culture: Join a collaborative environment where we innovate together as partners.
 • Cutting-edge Innovation: Work at the forefront of gaming and blockchain.
 • Key Strategic Projects: Be part of transformative initiatives that are redefining the gaming landscape.
 • Remote Flexibility: Enjoy a truly flexible, fully remote work setup that supports your lifestyle.
 • Talented Team: Collaborate with a team of passionate, driven, and skilled professionals.
 • Community Impact: Contribute to the growth and success of the Web3 and gaming communities.
 • Flexible Payment Options: Receive payments in crypto or fiat, tailored to your preference.
 • Growth Opportunities: Access valuable learning experiences and development paths.
 
MentTech Labs, Inc. is an equal opportunities workplace that doesn’t discriminate based on race, ethnicity, gender, ancestry, national origin, religion, sex, sexual orientation, gender identity, age disability, veteran status, genetic information, marital status, or any other legally protected status.

Solana Developer Needed – Pump.fun Style Platform (Starter Code Available)
 
Hi,
 
I’m reaching out from Valiant Solution LLC. We’re currently working with a U.S.-based client who is an experienced crypto professional and we’re looking for a skilled Solana developer to help build a platform similar to Pump.fun.
 
We already have a basic codebase from GitHub that the developer can start from, so the project will mainly involve customizing, improving, and completing the functionality rather than building everything from scratch.
 
Key requirements:
• Experience with Solana smart contracts (Rust / Anchor)
• Knowledge of token launch mechanics and bonding curves
• Experience with Solana Web3 integrations
• Ability to work with an existing codebase and extend it
 
If this sounds interesting, please reply with:
• Your Solana development experience
• Links to relevant projects or GitHub
• Your availability for a quick discussion
 
Looking forward to connecting.
 
Best regards,
Valiant Solution LLC

🌐 About Us
Neonflick is a tech organization specializing in Web3 development.
We believe Web3 solutions are not as popular as they could be — mainly due to complexity. Our mission is to simplify the user experience and make decentralized technology more accessible and easy to use for everyone.
🚀 About the Role
We are looking for a Web3 Fullstack Developer who is passionate about decentralized technologies and excited to contribute to building meaningful Web3 products. You will work on developing new products, improving existing ones, and fixing bugs, all while proposing innovative ideas to enhance our platform.
🔹 Responsibilities
Develop functional and user-friendly Web3 products
Improve and optimize existing products and features
Identify and fix bugs or issues in the system
Propose and implement new ideas for product development
Collaborate with the team to ensure high-quality software delivery
🔹 Requirements
Strong interest in Web3 / blockchain / decentralized technologies
Fullstack development experience (frontend + backend)
Experience with smart contracts and decentralized frameworks is a plus
Problem-solving skills and attention to detail
Ability to work independently and proactively
🔹 What You Get
Early-stage involvement in a Web3 tech organization
Influence over product development and feature design
Opportunity to build experience and a portfolio in the Web3 space
Potential long-term collaboration and future compensation as the project grows
A chance to contribute to making Web3 simpler and more accessible
⚠️ Important
This is an unpaid position. We are looking for someone motivated by vision, learning, and long-term impact rather than immediate salary.
If you are passionate about Web3 and building meaningful decentralized products, we’d love to hear from you.

We’re hiring a high-impact Growth Marketing Expert who can drive real user acquisition and measurable volume growth — not just manage community channels.
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.

We are Nebula Nodes, building a high-performance L2 protocol. We are looking for an engineer who understands the difference between "writing a smart contract" and "designing a scalable ecosystem".
 
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.